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authorbors <bors@rust-lang.org>2021-02-06 23:44:42 +0000
committerbors <bors@rust-lang.org>2021-02-06 23:44:42 +0000
commit08fdbd59b7db4f7ad9c11628f27d8e7c7986d8a1 (patch)
tree5415eb5837ff3858612d818f9c12fed181c98213
parenta73c2e555c26ef0c8b98c91c97a7d24b7017267f (diff)
parent64950297e23262df909587f85347bedffcce3f95 (diff)
downloadrust-08fdbd59b7db4f7ad9c11628f27d8e7c7986d8a1.tar.gz
rust-08fdbd59b7db4f7ad9c11628f27d8e7c7986d8a1.zip
Auto merge of #78052 - da-x:path-trimming-type-aliases, r=davidtwco
path trimming: ignore type aliases

Continuation of #73996.
-rw-r--r--compiler/rustc_middle/src/ty/print/pretty.rs1
-rw-r--r--src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.before-SimplifyBranches-final.after.diff2
-rw-r--r--src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.diff2
-rw-r--r--src/test/mir-opt/funky_arms.float_to_exponential_common.ConstProp.diff2
-rw-r--r--src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff4
-rw-r--r--src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff4
-rw-r--r--src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff4
-rw-r--r--src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff4
-rw-r--r--src/test/mir-opt/simplify_arm.id_result.SimplifyArmIdentity.diff2
-rw-r--r--src/test/mir-opt/simplify_arm.id_result.SimplifyBranchSame.diff2
-rw-r--r--src/test/mir-opt/simplify_arm.id_try.SimplifyArmIdentity.diff6
-rw-r--r--src/test/mir-opt/simplify_arm.id_try.SimplifyBranchSame.diff6
-rw-r--r--src/test/mir-opt/simplify_try.try_identity.DestinationPropagation.diff6
-rw-r--r--src/test/mir-opt/simplify_try.try_identity.SimplifyArmIdentity.diff6
-rw-r--r--src/test/mir-opt/simplify_try.try_identity.SimplifyBranchSame.after.mir6
-rw-r--r--src/test/mir-opt/simplify_try.try_identity.SimplifyLocals.after.mir6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/Makefile2
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.abort/abort.might_abort.-------.InstrumentCoverage.0.html28
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.assert/assert.might_fail_assert.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#1}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#2}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on.-------.InstrumentCoverage.0.html136
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.main.-------.InstrumentCoverage.0.html54
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#0}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#10}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#11}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#1}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#2}.-------.InstrumentCoverage.0.html12
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#3}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#5}.-------.InstrumentCoverage.0.html12
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#6}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#7}.-------.InstrumentCoverage.0.html12
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#8}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#9}.-------.InstrumentCoverage.0.html4
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main.-------.InstrumentCoverage.0.html5870
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.conditions/conditions.main.-------.InstrumentCoverage.0.html16
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.main.-------.InstrumentCoverage.0.html32
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_fn.-------.InstrumentCoverage.0.html32
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_pub_fn_not_in_library.-------.InstrumentCoverage.0.html32
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest/doctest.main.-------.InstrumentCoverage.0.html20
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest_crate/doctest_crate.fn_run_in_doctests.-------.InstrumentCoverage.0.html40
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.main.-------.InstrumentCoverage.0.html8
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.{impl#0}-drop.-------.InstrumentCoverage.0.html24
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.main.-------.InstrumentCoverage.0.html8
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.{impl#1}-drop.-------.InstrumentCoverage.0.html24
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if/if.main.-------.InstrumentCoverage.0.html76
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if_else/if_else.main.-------.InstrumentCoverage.0.html36
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-InTrait-default_trait_func.-------.InstrumentCoverage.0.html16
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-in_func.-------.InstrumentCoverage.0.html40
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-{impl#0}-trait_func.-------.InstrumentCoverage.0.html8
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main.-------.InstrumentCoverage.0.html46
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.lazy_boolean/lazy_boolean.main.-------.InstrumentCoverage.0.html32
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.main.-------.InstrumentCoverage.0.html32
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.{impl#0}-fmt.-------.InstrumentCoverage.0.html10
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.match_or_pattern/match_or_pattern.main.-------.InstrumentCoverage.0.html36
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.nested_loops/nested_loops.main.-------.InstrumentCoverage.0.html14
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.main.-------.InstrumentCoverage.0.html48
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.might_overflow.-------.InstrumentCoverage.0.html84
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.panic_unwind/panic_unwind.might_panic.-------.InstrumentCoverage.0.html28
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.main.-------.InstrumentCoverage.0.html96
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#7}-fmt.-------.InstrumentCoverage.0.html10
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#8}-clone.-------.InstrumentCoverage.0.html6
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_loop/simple_loop.main.-------.InstrumentCoverage.0.html40
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_match/simple_match.main.-------.InstrumentCoverage.0.html34
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.try_error_result/try_error_result.main.-------.InstrumentCoverage.0.html8
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_function.-------.InstrumentCoverage.0.html16
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_generic_function.-------.InstrumentCoverage.0.html24
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_private_function.-------.InstrumentCoverage.0.html16
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.use_this_lib_crate.-------.InstrumentCoverage.0.html36
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html24
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_function.-------.InstrumentCoverage.0.html12
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_bin_crate_generic_function.-------.InstrumentCoverage.0.html24
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_this_lib_crate_generic_function.-------.InstrumentCoverage.0.html24
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_with_same_type_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html24
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.uses_crate/uses_crate.main.-------.InstrumentCoverage.0.html96
-rw-r--r--src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.yield/yield.main.-------.InstrumentCoverage.0.html38
-rw-r--r--src/test/ui/async-await/async-block-control-flow-static-semantics.stderr8
-rw-r--r--src/test/ui/async-await/issues/issue-67893.stderr6
-rw-r--r--src/test/ui/coercion/coercion-missing-tail-expected-type.stderr4
-rw-r--r--src/test/ui/feature-gates/feature-gate-exhaustive-patterns.stderr2
-rw-r--r--src/test/ui/generator/type-mismatch-signature-deduction.stderr10
-rw-r--r--src/test/ui/generics/wrong-number-of-args.rs2
-rw-r--r--src/test/ui/generics/wrong-number-of-args.stderr2
-rw-r--r--src/test/ui/impl-trait/trait_type.stderr8
-rw-r--r--src/test/ui/inference/cannot-infer-closure-circular.stderr4
-rw-r--r--src/test/ui/inference/cannot-infer-closure.stderr6
-rw-r--r--src/test/ui/inference/cannot-infer-partial-try-return.stderr6
-rw-r--r--src/test/ui/inference/issue-72616.stderr2
-rw-r--r--src/test/ui/issue-74047.stderr2
-rw-r--r--src/test/ui/issues/issue-11844.stderr4
-rw-r--r--src/test/ui/issues/issue-12552.stderr12
-rw-r--r--src/test/ui/issues/issue-13466.rs8
-rw-r--r--src/test/ui/issues/issue-13466.stderr8
-rw-r--r--src/test/ui/issues/issue-21332.rs2
-rw-r--r--src/test/ui/issues/issue-21332.stderr4
-rw-r--r--src/test/ui/issues/issue-3680.rs4
-rw-r--r--src/test/ui/issues/issue-3680.stderr4
-rw-r--r--src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr2
-rw-r--r--src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr4
-rw-r--r--src/test/ui/issues/issue-51632-try-desugar-incompatible-types.stderr4
-rw-r--r--src/test/ui/issues/issue-6458-4.stderr4
-rw-r--r--src/test/ui/lifetimes/lifetime-elision-return-type-trait.stderr4
-rw-r--r--src/test/ui/lint/lint-ctypes-enum.stderr2
-rw-r--r--src/test/ui/lint/must_use-tuple.rs10
-rw-r--r--src/test/ui/lint/must_use-tuple.stderr10
-rw-r--r--src/test/ui/macros/must-use-in-macro-55516.stderr2
-rw-r--r--src/test/ui/mismatched_types/abridged.stderr10
-rw-r--r--src/test/ui/mismatched_types/binops.rs2
-rw-r--r--src/test/ui/mismatched_types/binops.stderr6
-rw-r--r--src/test/ui/mismatched_types/method-help-unsatisfied-bound.stderr4
-rw-r--r--src/test/ui/nll/issue-54556-niconii.stderr2
-rw-r--r--src/test/ui/or-patterns/inconsistent-modes.stderr2
-rw-r--r--src/test/ui/parser/unclosed-delimiter-in-dep.stderr4
-rw-r--r--src/test/ui/pattern/bindings-after-at/borrowck-move-and-move.stderr4
-rw-r--r--src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr4
-rw-r--r--src/test/ui/pattern/pat-struct-field-expr-has-type.stderr4
-rw-r--r--src/test/ui/pattern/pat-type-err-let-stmt.stderr12
-rw-r--r--src/test/ui/pattern/usefulness/non-exhaustive-match-nested.stderr2
-rw-r--r--src/test/ui/recursion/recursive-types-are-not-uninhabited.stderr2
-rw-r--r--src/test/ui/rfc-1937-termination-trait/termination-trait-test-wrong-type.stderr4
-rw-r--r--src/test/ui/rfc-2294-if-let-guard/typeck.stderr4
-rw-r--r--src/test/ui/span/impl-wrong-item-for-trait.stderr2
-rw-r--r--src/test/ui/suggestions/as-ref.stderr12
-rw-r--r--src/test/ui/suggestions/mut-ref-reassignment.stderr2
-rw-r--r--src/test/ui/suggestions/option-content-move.stderr2
-rw-r--r--src/test/ui/suggestions/suggest-box.stderr2
-rw-r--r--src/test/ui/traits/self-without-lifetime-constraint.stderr8
-rw-r--r--src/test/ui/try-block/try-block-bad-type.stderr4
-rw-r--r--src/test/ui/uninhabited/uninhabited-matches-feature-gated.stderr6
142 files changed, 3922 insertions, 3919 deletions
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index 4937fdd7314..a8d9995bd0b 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -2143,6 +2143,7 @@ fn for_each_def(tcx: TyCtxt<'_>, mut collect_fn: impl for<'b> FnMut(&'b Ident, N
 
             match child.res {
                 def::Res::Def(DefKind::AssocTy, _) => {}
+                def::Res::Def(DefKind::TyAlias, _) => {}
                 def::Res::Def(defkind, def_id) => {
                     if let Some(ns) = defkind.ns() {
                         collect_fn(&child.ident, ns, def_id);
diff --git a/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.before-SimplifyBranches-final.after.diff b/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.before-SimplifyBranches-final.after.diff
index f51a08ed730..1b292cdd796 100644
--- a/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.before-SimplifyBranches-final.after.diff
+++ b/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.before-SimplifyBranches-final.after.diff
@@ -1,7 +1,7 @@
 - // MIR for `try_sum` before EarlyOtherwiseBranch
 + // MIR for `try_sum` after SimplifyBranches-final
   
-  fn try_sum(_1: &ViewportPercentageLength, _2: &ViewportPercentageLength) -> std::result::Result<ViewportPercentageLength, ()> {
+  fn try_sum(_1: &ViewportPercentageLength, _2: &ViewportPercentageLength) -> Result<ViewportPercentageLength, ()> {
       debug x => _1;                       // in scope 0 at $DIR/early_otherwise_branch_68867.rs:18:5: 18:6
       debug other => _2;                   // in scope 0 at $DIR/early_otherwise_branch_68867.rs:19:5: 19:10
       let mut _0: std::result::Result<ViewportPercentageLength, ()>; // return place in scope 0 at $DIR/early_otherwise_branch_68867.rs:20:6: 20:42
diff --git a/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.diff b/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.diff
index 05ef6721e65..d20ee784591 100644
--- a/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.diff
+++ b/src/test/mir-opt/early_otherwise_branch_68867.try_sum.EarlyOtherwiseBranch.diff
@@ -1,7 +1,7 @@
 - // MIR for `try_sum` before EarlyOtherwiseBranch
 + // MIR for `try_sum` after EarlyOtherwiseBranch
   
-  fn try_sum(_1: &ViewportPercentageLength, _2: &ViewportPercentageLength) -> std::result::Result<ViewportPercentageLength, ()> {
+  fn try_sum(_1: &ViewportPercentageLength, _2: &ViewportPercentageLength) -> Result<ViewportPercentageLength, ()> {
       debug x => _1;                       // in scope 0 at $DIR/early_otherwise_branch_68867.rs:18:5: 18:6
       debug other => _2;                   // in scope 0 at $DIR/early_otherwise_branch_68867.rs:19:5: 19:10
       let mut _0: std::result::Result<ViewportPercentageLength, ()>; // return place in scope 0 at $DIR/early_otherwise_branch_68867.rs:20:6: 20:42
diff --git a/src/test/mir-opt/funky_arms.float_to_exponential_common.ConstProp.diff b/src/test/mir-opt/funky_arms.float_to_exponential_common.ConstProp.diff
index bb79cd80e51..caa02abf019 100644
--- a/src/test/mir-opt/funky_arms.float_to_exponential_common.ConstProp.diff
+++ b/src/test/mir-opt/funky_arms.float_to_exponential_common.ConstProp.diff
@@ -1,7 +1,7 @@
 - // MIR for `float_to_exponential_common` before ConstProp
 + // MIR for `float_to_exponential_common` after ConstProp
   
-  fn float_to_exponential_common(_1: &mut Formatter, _2: &T, _3: bool) -> std::result::Result<(), std::fmt::Error> {
+  fn float_to_exponential_common(_1: &mut Formatter, _2: &T, _3: bool) -> Result<(), std::fmt::Error> {
       debug fmt => _1;                     // in scope 0 at $DIR/funky_arms.rs:11:35: 11:38
       debug num => _2;                     // in scope 0 at $DIR/funky_arms.rs:11:60: 11:63
       debug upper => _3;                   // in scope 0 at $DIR/funky_arms.rs:11:69: 11:74
diff --git a/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff b/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff
index 9139f2cf609..e4916a56bea 100644
--- a/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff
+++ b/src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff
@@ -128,7 +128,7 @@
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
                                            // + literal: Const { ty: for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {<&i32 as std::fmt::Debug>::fmt}, val: Value(Scalar(<ZST>)) }
           StorageLive(_22);                // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _22 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _23) -> bb3; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _22 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _23) -> bb3; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
@@ -158,7 +158,7 @@
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
                                            // + literal: Const { ty: for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {<&i32 as std::fmt::Debug>::fmt}, val: Value(Scalar(<ZST>)) }
           StorageLive(_25);                // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _25 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _26) -> bb5; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _25 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _26) -> bb5; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
diff --git a/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff b/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff
index 9139f2cf609..e4916a56bea 100644
--- a/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff
+++ b/src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff
@@ -128,7 +128,7 @@
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
                                            // + literal: Const { ty: for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {<&i32 as std::fmt::Debug>::fmt}, val: Value(Scalar(<ZST>)) }
           StorageLive(_22);                // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _22 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _23) -> bb3; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _22 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _23) -> bb3; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
@@ -158,7 +158,7 @@
                                            // + span: $SRC_DIR/core/src/macros/mod.rs:LL:COL
                                            // + literal: Const { ty: for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {<&i32 as std::fmt::Debug>::fmt}, val: Value(Scalar(<ZST>)) }
           StorageLive(_25);                // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _25 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _26) -> bb5; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _25 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _26) -> bb5; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
diff --git a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff
index 0eea0bf0a06..b5dd416ddb1 100644
--- a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff
+++ b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.32bit.diff
@@ -203,7 +203,7 @@
           StorageLive(_44);                // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
           StorageLive(_45);                // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
           _45 = _38;                       // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _44 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _45) -> bb5; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _44 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _45) -> bb5; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
@@ -252,7 +252,7 @@
           StorageLive(_48);                // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
           StorageLive(_49);                // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
           _49 = _41;                       // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _48 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _49) -> bb7; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _48 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _49) -> bb7; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
diff --git a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff
index 0eea0bf0a06..b5dd416ddb1 100644
--- a/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff
+++ b/src/test/mir-opt/issue_73223.main.SimplifyArmIdentity.64bit.diff
@@ -203,7 +203,7 @@
           StorageLive(_44);                // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
           StorageLive(_45);                // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
           _45 = _38;                       // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _44 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _45) -> bb5; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _44 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _45) -> bb5; // scope 7 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
@@ -252,7 +252,7 @@
           StorageLive(_48);                // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
           StorageLive(_49);                // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
           _49 = _41;                       // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
-          _48 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>(move _49) -> bb7; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
+          _48 = transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut Formatter<'t0>) -> Result<(), std::fmt::Error>>(move _49) -> bb7; // scope 9 at $SRC_DIR/core/src/panic.rs:LL:COL
                                            // mir::Constant
                                            // + span: $SRC_DIR/core/src/panic.rs:LL:COL
                                            // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>) -> for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error> {std::intrinsics::transmute::<for<'r, 's, 't0> fn(&'r &i32, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>, for<'r, 's, 't0> fn(&'r core::fmt::Opaque, &'s mut std::fmt::Formatter<'t0>) -> std::result::Result<(), std::fmt::Error>>}, val: Value(Scalar(<ZST>)) }
diff --git a/src/test/mir-opt/simplify_arm.id_result.SimplifyArmIdentity.diff b/src/test/mir-opt/simplify_arm.id_result.SimplifyArmIdentity.diff
index 253e3236ff7..40c18fb7282 100644
--- a/src/test/mir-opt/simplify_arm.id_result.SimplifyArmIdentity.diff
+++ b/src/test/mir-opt/simplify_arm.id_result.SimplifyArmIdentity.diff
@@ -1,7 +1,7 @@
 - // MIR for `id_result` before SimplifyArmIdentity
 + // MIR for `id_result` after SimplifyArmIdentity
   
-  fn id_result(_1: std::result::Result<u8, i32>) -> std::result::Result<u8, i32> {
+  fn id_result(_1: Result<u8, i32>) -> Result<u8, i32> {
       debug r => _1;                       // in scope 0 at $DIR/simplify-arm.rs:16:14: 16:15
       let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:16:37: 16:52
       let mut _2: isize;                   // in scope 0 at $DIR/simplify-arm.rs:18:9: 18:14
diff --git a/src/test/mir-opt/simplify_arm.id_result.SimplifyBranchSame.diff b/src/test/mir-opt/simplify_arm.id_result.SimplifyBranchSame.diff
index 23cf43c5319..596dbabead0 100644
--- a/src/test/mir-opt/simplify_arm.id_result.SimplifyBranchSame.diff
+++ b/src/test/mir-opt/simplify_arm.id_result.SimplifyBranchSame.diff
@@ -1,7 +1,7 @@
 - // MIR for `id_result` before SimplifyBranchSame
 + // MIR for `id_result` after SimplifyBranchSame
   
-  fn id_result(_1: std::result::Result<u8, i32>) -> std::result::Result<u8, i32> {
+  fn id_result(_1: Result<u8, i32>) -> Result<u8, i32> {
       debug r => _1;                       // in scope 0 at $DIR/simplify-arm.rs:16:14: 16:15
       let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:16:37: 16:52
       let mut _2: isize;                   // in scope 0 at $DIR/simplify-arm.rs:18:9: 18:14
diff --git a/src/test/mir-opt/simplify_arm.id_try.SimplifyArmIdentity.diff b/src/test/mir-opt/simplify_arm.id_try.SimplifyArmIdentity.diff
index 84d8214122a..ccb3b71817f 100644
--- a/src/test/mir-opt/simplify_arm.id_try.SimplifyArmIdentity.diff
+++ b/src/test/mir-opt/simplify_arm.id_try.SimplifyArmIdentity.diff
@@ -1,7 +1,7 @@
 - // MIR for `id_try` before SimplifyArmIdentity
 + // MIR for `id_try` after SimplifyArmIdentity
   
-  fn id_try(_1: std::result::Result<u8, i32>) -> std::result::Result<u8, i32> {
+  fn id_try(_1: Result<u8, i32>) -> Result<u8, i32> {
       debug r => _1;                       // in scope 0 at $DIR/simplify-arm.rs:23:11: 23:12
       let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:23:34: 23:49
       let _2: u8;                          // in scope 0 at $DIR/simplify-arm.rs:24:9: 24:10
@@ -26,7 +26,7 @@
 -                 debug t => _9;           // in scope 7 at $DIR/simplify-arm.rs:24:14: 24:15
 +                 debug t => ((_0 as Err).0: i32); // in scope 7 at $DIR/simplify-arm.rs:24:14: 24:15
               }
-              scope 8 (inlined <std::result::Result<u8, i32> as Try>::from_error) { // at $DIR/simplify-arm.rs:24:13: 24:15
+              scope 8 (inlined <Result<u8, i32> as Try>::from_error) { // at $DIR/simplify-arm.rs:24:13: 24:15
 -                 debug v => _8;           // in scope 8 at $DIR/simplify-arm.rs:24:13: 24:15
 +                 debug v => ((_0 as Err).0: i32); // in scope 8 at $DIR/simplify-arm.rs:24:13: 24:15
                   let mut _12: i32;        // in scope 8 at $DIR/simplify-arm.rs:24:13: 24:15
@@ -39,7 +39,7 @@
           scope 5 {
           }
       }
-      scope 6 (inlined <std::result::Result<u8, i32> as Try>::into_result) { // at $DIR/simplify-arm.rs:24:13: 24:15
+      scope 6 (inlined <Result<u8, i32> as Try>::into_result) { // at $DIR/simplify-arm.rs:24:13: 24:15
           debug self => _4;                // in scope 6 at $DIR/simplify-arm.rs:24:13: 24:15
       }
   
diff --git a/src/test/mir-opt/simplify_arm.id_try.SimplifyBranchSame.diff b/src/test/mir-opt/simplify_arm.id_try.SimplifyBranchSame.diff
index aa050655cda..ec8ac30228e 100644
--- a/src/test/mir-opt/simplify_arm.id_try.SimplifyBranchSame.diff
+++ b/src/test/mir-opt/simplify_arm.id_try.SimplifyBranchSame.diff
@@ -1,7 +1,7 @@
 - // MIR for `id_try` before SimplifyBranchSame
 + // MIR for `id_try` after SimplifyBranchSame
   
-  fn id_try(_1: std::result::Result<u8, i32>) -> std::result::Result<u8, i32> {
+  fn id_try(_1: Result<u8, i32>) -> Result<u8, i32> {
       debug r => _1;                       // in scope 0 at $DIR/simplify-arm.rs:23:11: 23:12
       let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:23:34: 23:49
       let _2: u8;                          // in scope 0 at $DIR/simplify-arm.rs:24:9: 24:10
@@ -23,7 +23,7 @@
               scope 7 (inlined <i32 as From<i32>>::from) { // at $DIR/simplify-arm.rs:24:14: 24:15
                   debug t => ((_0 as Err).0: i32); // in scope 7 at $DIR/simplify-arm.rs:24:14: 24:15
               }
-              scope 8 (inlined <std::result::Result<u8, i32> as Try>::from_error) { // at $DIR/simplify-arm.rs:24:13: 24:15
+              scope 8 (inlined <Result<u8, i32> as Try>::from_error) { // at $DIR/simplify-arm.rs:24:13: 24:15
                   debug v => ((_0 as Err).0: i32); // in scope 8 at $DIR/simplify-arm.rs:24:13: 24:15
                   let mut _12: i32;        // in scope 8 at $DIR/simplify-arm.rs:24:13: 24:15
               }
@@ -34,7 +34,7 @@
           scope 5 {
           }
       }
-      scope 6 (inlined <std::result::Result<u8, i32> as Try>::into_result) { // at $DIR/simplify-arm.rs:24:13: 24:15
+      scope 6 (inlined <Result<u8, i32> as Try>::into_result) { // at $DIR/simplify-arm.rs:24:13: 24:15
           debug self => _4;                // in scope 6 at $DIR/simplify-arm.rs:24:13: 24:15
       }
   
diff --git a/src/test/mir-opt/simplify_try.try_identity.DestinationPropagation.diff b/src/test/mir-opt/simplify_try.try_identity.DestinationPropagation.diff
index 3ba0af991f6..b1bae447f9c 100644
--- a/src/test/mir-opt/simplify_try.try_identity.DestinationPropagation.diff
+++ b/src/test/mir-opt/simplify_try.try_identity.DestinationPropagation.diff
@@ -1,7 +1,7 @@
 - // MIR for `try_identity` before DestinationPropagation
 + // MIR for `try_identity` after DestinationPropagation
   
-  fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
+  fn try_identity(_1: Result<u32, i32>) -> Result<u32, i32> {
       debug x => _1;                       // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
       let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
       let _2: u32;                         // in scope 0 at $DIR/simplify_try.rs:8:9: 8:10
@@ -23,7 +23,7 @@
               scope 7 (inlined <i32 as From<i32>>::from) { // at $DIR/simplify_try.rs:8:14: 8:15
                   debug t => ((_0 as Err).0: i32); // in scope 7 at $DIR/simplify_try.rs:8:14: 8:15
               }
-              scope 8 (inlined <std::result::Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
+              scope 8 (inlined <Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
                   debug v => ((_0 as Err).0: i32); // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
                   let mut _12: i32;        // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
               }
@@ -34,7 +34,7 @@
           scope 5 {
           }
       }
-      scope 6 (inlined <std::result::Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
+      scope 6 (inlined <Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
 -         debug self => _4;                // in scope 6 at $DIR/simplify_try.rs:8:13: 8:15
 +         debug self => _0;                // in scope 6 at $DIR/simplify_try.rs:8:13: 8:15
       }
diff --git a/src/test/mir-opt/simplify_try.try_identity.SimplifyArmIdentity.diff b/src/test/mir-opt/simplify_try.try_identity.SimplifyArmIdentity.diff
index 9c91762eb4e..df274852f68 100644
--- a/src/test/mir-opt/simplify_try.try_identity.SimplifyArmIdentity.diff
+++ b/src/test/mir-opt/simplify_try.try_identity.SimplifyArmIdentity.diff
@@ -1,7 +1,7 @@
 - // MIR for `try_identity` before SimplifyArmIdentity
 + // MIR for `try_identity` after SimplifyArmIdentity
   
-  fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
+  fn try_identity(_1: Result<u32, i32>) -> Result<u32, i32> {
       debug x => _1;                       // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
       let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
       let _2: u32;                         // in scope 0 at $DIR/simplify_try.rs:8:9: 8:10
@@ -26,7 +26,7 @@
 -                 debug t => _9;           // in scope 7 at $DIR/simplify_try.rs:8:14: 8:15
 +                 debug t => ((_0 as Err).0: i32); // in scope 7 at $DIR/simplify_try.rs:8:14: 8:15
               }
-              scope 8 (inlined <std::result::Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
+              scope 8 (inlined <Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
 -                 debug v => _8;           // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
 +                 debug v => ((_0 as Err).0: i32); // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
                   let mut _12: i32;        // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
@@ -39,7 +39,7 @@
           scope 5 {
           }
       }
-      scope 6 (inlined <std::result::Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
+      scope 6 (inlined <Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
           debug self => _4;                // in scope 6 at $DIR/simplify_try.rs:8:13: 8:15
       }
   
diff --git a/src/test/mir-opt/simplify_try.try_identity.SimplifyBranchSame.after.mir b/src/test/mir-opt/simplify_try.try_identity.SimplifyBranchSame.after.mir
index cd8436a971e..37274691fb4 100644
--- a/src/test/mir-opt/simplify_try.try_identity.SimplifyBranchSame.after.mir
+++ b/src/test/mir-opt/simplify_try.try_identity.SimplifyBranchSame.after.mir
@@ -1,6 +1,6 @@
 // MIR for `try_identity` after SimplifyBranchSame
 
-fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
+fn try_identity(_1: Result<u32, i32>) -> Result<u32, i32> {
     debug x => _1;                       // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
     let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
     let _2: u32;                         // in scope 0 at $DIR/simplify_try.rs:8:9: 8:10
@@ -22,7 +22,7 @@ fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i
             scope 7 (inlined <i32 as From<i32>>::from) { // at $DIR/simplify_try.rs:8:14: 8:15
                 debug t => ((_0 as Err).0: i32); // in scope 7 at $DIR/simplify_try.rs:8:14: 8:15
             }
-            scope 8 (inlined <std::result::Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
+            scope 8 (inlined <Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
                 debug v => ((_0 as Err).0: i32); // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
                 let mut _12: i32;        // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
             }
@@ -33,7 +33,7 @@ fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i
         scope 5 {
         }
     }
-    scope 6 (inlined <std::result::Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
+    scope 6 (inlined <Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
         debug self => _4;                // in scope 6 at $DIR/simplify_try.rs:8:13: 8:15
     }
 
diff --git a/src/test/mir-opt/simplify_try.try_identity.SimplifyLocals.after.mir b/src/test/mir-opt/simplify_try.try_identity.SimplifyLocals.after.mir
index 73f77f35a2b..f8adcced4b3 100644
--- a/src/test/mir-opt/simplify_try.try_identity.SimplifyLocals.after.mir
+++ b/src/test/mir-opt/simplify_try.try_identity.SimplifyLocals.after.mir
@@ -1,6 +1,6 @@
 // MIR for `try_identity` after SimplifyLocals
 
-fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
+fn try_identity(_1: Result<u32, i32>) -> Result<u32, i32> {
     debug x => _1;                       // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
     let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
     scope 1 {
@@ -12,7 +12,7 @@ fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i
             scope 7 (inlined <i32 as From<i32>>::from) { // at $DIR/simplify_try.rs:8:14: 8:15
                 debug t => ((_0 as Err).0: i32); // in scope 7 at $DIR/simplify_try.rs:8:14: 8:15
             }
-            scope 8 (inlined <std::result::Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
+            scope 8 (inlined <Result<u32, i32> as Try>::from_error) { // at $DIR/simplify_try.rs:8:13: 8:15
                 debug v => ((_0 as Err).0: i32); // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
             }
         }
@@ -22,7 +22,7 @@ fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i
         scope 5 {
         }
     }
-    scope 6 (inlined <std::result::Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
+    scope 6 (inlined <Result<u32, i32> as Try>::into_result) { // at $DIR/simplify_try.rs:8:13: 8:15
         debug self => _0;                // in scope 6 at $DIR/simplify_try.rs:8:13: 8:15
     }
 
diff --git a/src/test/run-make-fulldeps/coverage-spanview/Makefile b/src/test/run-make-fulldeps/coverage-spanview/Makefile
index 2713e7d52ff..cd54ac0ed4c 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/Makefile
+++ b/src/test/run-make-fulldeps/coverage-spanview/Makefile
@@ -42,6 +42,7 @@ endif
 				echo "--edition=2018" \
 			) \
 			--crate-type rlib \
+			-Ztrim-diagnostic-paths=no \
 			-Zinstrument-coverage \
 			-Zdump-mir=InstrumentCoverage \
 			-Zdump-mir-spanview \
@@ -73,6 +74,7 @@ endif
 				echo "--edition=2018" \
 			) \
 			-L "$(TMPDIR)" \
+			-Ztrim-diagnostic-paths=no \
 			-Zinstrument-coverage \
 			-Zdump-mir=InstrumentCoverage \
 			-Zdump-mir-spanview \
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.abort/abort.might_abort.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.abort/abort.might_abort.-------.InstrumentCoverage.0.html
index b058dce2983..a302b974ae1 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.abort/abort.might_abort.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.abort/abort.might_abort.-------.InstrumentCoverage.0.html
@@ -81,10 +81,10 @@ For revisions in Pull Requests (PR):
 7:9-7:33: @1[18]: _13 = &amp;(*_32)
 7:9-7:33: @1[19]: _12 = &amp;(*_13)
 7:9-7:33: @1[20]: _11 = move _12 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-7:9-7:33: @1.Call: _6 = Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
-7:9-7:33: @3.Call: _5 = _print(move _6) -&gt; [return: bb4, unwind: bb7]
+7:9-7:33: @1.Call: _6 = std::fmt::Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
+7:9-7:33: @3.Call: _5 = std::io::_print(move _6) -&gt; [return: bb4, unwind: bb7]
 7:9-7:33: @4[5]: _4 = const ()
-8:9-8:37: @4.Call: begin_panic::&lt;&amp;str&gt;(const &quot;panics and aborts&quot;) -&gt; bb7"><span class="annotation">@1,3,4⦊</span>println!("aborting...");</span></span>
+8:9-8:37: @4.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;panics and aborts&quot;) -&gt; bb7"><span class="annotation">@1,3,4⦊</span>println!("aborting...");</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="7:18-7:31: @1[6]: _33 = const might_abort::promoted[3]
 7:18-7:31: @1[7]: _9 = &amp;(*_33)
 7:18-7:31: @1[8]: _8 = &amp;(*_9)
@@ -95,10 +95,10 @@ For revisions in Pull Requests (PR):
 7:9-7:33: @1[18]: _13 = &amp;(*_32)
 7:9-7:33: @1[19]: _12 = &amp;(*_13)
 7:9-7:33: @1[20]: _11 = move _12 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-7:9-7:33: @1.Call: _6 = Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
-7:9-7:33: @3.Call: _5 = _print(move _6) -&gt; [return: bb4, unwind: bb7]
+7:9-7:33: @1.Call: _6 = std::fmt::Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
+7:9-7:33: @3.Call: _5 = std::io::_print(move _6) -&gt; [return: bb4, unwind: bb7]
 7:9-7:33: @4[5]: _4 = const ()
-8:9-8:37: @4.Call: begin_panic::&lt;&amp;str&gt;(const &quot;panics and aborts&quot;) -&gt; bb7">        panic!("panics and aborts");<span class="annotation">⦉@1,3,4</span></span></span><span class="code" style="--layer: 0"></span></span>
+8:9-8:37: @4.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;panics and aborts&quot;) -&gt; bb7">        panic!("panics and aborts");<span class="annotation">⦉@1,3,4</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    } else </span><span><span class="code even" style="--layer: 1" title="10:18-10:31: @2[6]: _31 = const might_abort::promoted[1]
 10:18-10:31: @2[7]: _23 = &amp;(*_31)
 10:18-10:31: @2[8]: _22 = &amp;(*_23)
@@ -109,8 +109,8 @@ For revisions in Pull Requests (PR):
 10:9-10:33: @2[18]: _27 = &amp;(*_30)
 10:9-10:33: @2[19]: _26 = &amp;(*_27)
 10:9-10:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-10:9-10:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-10:9-10:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+10:9-10:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+10:9-10:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 10:9-10:33: @6[5]: _18 = const ()
 9:12-11:6: @6[7]: _0 = const ()
 12:2-12:2: @6.Return: return"><span class="annotation">@2,5,6⦊</span>{</span></span>
@@ -124,8 +124,8 @@ For revisions in Pull Requests (PR):
 10:9-10:33: @2[18]: _27 = &amp;(*_30)
 10:9-10:33: @2[19]: _26 = &amp;(*_27)
 10:9-10:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-10:9-10:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-10:9-10:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+10:9-10:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+10:9-10:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 10:9-10:33: @6[5]: _18 = const ()
 9:12-11:6: @6[7]: _0 = const ()
 12:2-12:2: @6.Return: return">        println!("Don't Panic");</span></span>
@@ -139,8 +139,8 @@ For revisions in Pull Requests (PR):
 10:9-10:33: @2[18]: _27 = &amp;(*_30)
 10:9-10:33: @2[19]: _26 = &amp;(*_27)
 10:9-10:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-10:9-10:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-10:9-10:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+10:9-10:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+10:9-10:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 10:9-10:33: @6[5]: _18 = const ()
 9:12-11:6: @6[7]: _0 = const ()
 12:2-12:2: @6.Return: return">    }</span></span>
@@ -154,8 +154,8 @@ For revisions in Pull Requests (PR):
 10:9-10:33: @2[18]: _27 = &amp;(*_30)
 10:9-10:33: @2[19]: _26 = &amp;(*_27)
 10:9-10:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-10:9-10:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-10:9-10:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+10:9-10:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+10:9-10:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 10:9-10:33: @6[5]: _18 = const ()
 9:12-11:6: @6[7]: _0 = const ()
 12:2-12:2: @6.Return: return">}<span class="annotation">⦉@2,5,6</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.assert/assert.might_fail_assert.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.assert/assert.might_fail_assert.-------.InstrumentCoverage.0.html
index 823bb0cfd84..b7f3cf0819f 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.assert/assert.might_fail_assert.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.assert/assert.might_fail_assert.-------.InstrumentCoverage.0.html
@@ -80,13 +80,13 @@ For revisions in Pull Requests (PR):
 5:5-5:48: @0[22]: _15 = (_13.0: &amp;u32)
 5:5-5:48: @0[25]: _17 = &amp;(*_15)
 5:5-5:48: @0[27]: _18 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-5:5-5:48: @0.Call: _16 = ArgumentV1::new::&lt;u32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb12]
+5:5-5:48: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb12]
 5:5-5:48: @1[2]: _12 = [move _16]
 5:5-5:48: @1[5]: _11 = &amp;_12
 5:5-5:48: @1[6]: _10 = &amp;(*_11)
 5:5-5:48: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-5:5-5:48: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb12]
-5:5-5:48: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb12]
+5:5-5:48: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb12]
+5:5-5:48: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb12]
 5:5-5:48: @3[6]: _2 = const ()"><span class="annotation">@0,1,2,3,4⦊</span>println!("does 1 + 1 = {}?", one_plus_one);<span class="annotation">⦉@0,1,2,3,4</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    assert_eq!(</span><span><span class="code even" style="--layer: 1" title="6:16-6:21: @3[11]: _23 = CheckedAdd(const 1_u32, const 1_u32)"><span class="annotation">@0,1,2,3,4⦊</span>1 + 1<span class="annotation">⦉@0,1,2,3,4</span></span></span><span class="code" style="--layer: 0">, one_plus_one, </span><span><span class="code odd" style="--layer: 1" title="6:37-6:61: @5[28]: _70 = const might_fail_assert::promoted[1]
 6:37-6:61: @5[29]: _50 = &amp;(*_70)
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#0}.-------.InstrumentCoverage.0.html
index 0f37df23fe9..64fc1568b00 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#0}.-------.InstrumentCoverage.0.html
@@ -73,12 +73,12 @@ For revisions in Pull Requests (PR):
 24:38-24:74: @1[5]: FakeRead(ForMatchedPlace, _13)
 24:38-24:74: @1[7]: _25 = (_13.0: &amp;std::fmt::Arguments)
 24:38-24:74: @1[10]: _27 = &amp;(*_25)
-24:38-24:74: @1[12]: _28 = &lt;Arguments as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::fmt::Arguments, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-24:38-24:74: @1.Call: _26 = ArgumentV1::new::&lt;Arguments&gt;(move _27, move _28) -&gt; [return: bb2, unwind: bb4]
+24:38-24:74: @1[12]: _28 = &lt;std::fmt::Arguments as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::fmt::Arguments, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+24:38-24:74: @1.Call: _26 = std::fmt::ArgumentV1::new::&lt;std::fmt::Arguments&gt;(move _27, move _28) -&gt; [return: bb2, unwind: bb4]
 24:38-24:74: @2[2]: _12 = [move _26]
 24:38-24:74: @2[5]: _11 = &amp;_12
 24:38-24:74: @2[6]: _10 = &amp;(*_11)
 24:38-24:74: @2[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-24:38-24:74: @2.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb3, unwind: bb4]"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">$crate::panicking::panic_fmt($crate::format_args!($fmt, $($arg)+))</span></span></div>
+24:38-24:74: @2.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb3, unwind: bb4]"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">$crate::panicking::panic_fmt($crate::format_args!($fmt, $($arg)+))</span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#1}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#1}.-------.InstrumentCoverage.0.html
index 828b9cebd6a..1bbcfa5744b 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#1}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#1}.-------.InstrumentCoverage.0.html
@@ -73,12 +73,12 @@ For revisions in Pull Requests (PR):
 24:38-24:74: @1[5]: FakeRead(ForMatchedPlace, _13)
 24:38-24:74: @1[7]: _25 = (_13.0: &amp;std::fmt::Arguments)
 24:38-24:74: @1[10]: _27 = &amp;(*_25)
-24:38-24:74: @1[12]: _28 = &lt;Arguments as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::fmt::Arguments, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-24:38-24:74: @1.Call: _26 = ArgumentV1::new::&lt;Arguments&gt;(move _27, move _28) -&gt; [return: bb2, unwind: bb4]
+24:38-24:74: @1[12]: _28 = &lt;std::fmt::Arguments as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::fmt::Arguments, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+24:38-24:74: @1.Call: _26 = std::fmt::ArgumentV1::new::&lt;std::fmt::Arguments&gt;(move _27, move _28) -&gt; [return: bb2, unwind: bb4]
 24:38-24:74: @2[2]: _12 = [move _26]
 24:38-24:74: @2[5]: _11 = &amp;_12
 24:38-24:74: @2[6]: _10 = &amp;(*_11)
 24:38-24:74: @2[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-24:38-24:74: @2.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb3, unwind: bb4]"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">$crate::panicking::panic_fmt($crate::format_args!($fmt, $($arg)+))</span></span></div>
+24:38-24:74: @2.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb3, unwind: bb4]"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">$crate::panicking::panic_fmt($crate::format_args!($fmt, $($arg)+))</span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#2}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#2}.-------.InstrumentCoverage.0.html
index 28b10e59b5a..14cb98d20c9 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#2}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on-VTABLE-{closure#2}.-------.InstrumentCoverage.0.html
@@ -73,12 +73,12 @@ For revisions in Pull Requests (PR):
 24:38-24:74: @1[5]: FakeRead(ForMatchedPlace, _13)
 24:38-24:74: @1[7]: _25 = (_13.0: &amp;std::fmt::Arguments)
 24:38-24:74: @1[10]: _27 = &amp;(*_25)
-24:38-24:74: @1[12]: _28 = &lt;Arguments as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::fmt::Arguments, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-24:38-24:74: @1.Call: _26 = ArgumentV1::new::&lt;Arguments&gt;(move _27, move _28) -&gt; [return: bb2, unwind: bb4]
+24:38-24:74: @1[12]: _28 = &lt;std::fmt::Arguments as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::fmt::Arguments, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+24:38-24:74: @1.Call: _26 = std::fmt::ArgumentV1::new::&lt;std::fmt::Arguments&gt;(move _27, move _28) -&gt; [return: bb2, unwind: bb4]
 24:38-24:74: @2[2]: _12 = [move _26]
 24:38-24:74: @2[5]: _11 = &amp;_12
 24:38-24:74: @2[6]: _10 = &amp;(*_11)
 24:38-24:74: @2[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-24:38-24:74: @2.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb3, unwind: bb4]"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">$crate::panicking::panic_fmt($crate::format_args!($fmt, $($arg)+))</span></span></div>
+24:38-24:74: @2.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb3, unwind: bb4]"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">$crate::panicking::panic_fmt($crate::format_args!($fmt, $($arg)+))</span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on.-------.InstrumentCoverage.0.html
index 81310c8cb25..9a5bd6e42cd 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.executor-block_on.-------.InstrumentCoverage.0.html
@@ -70,166 +70,166 @@ For revisions in Pull Requests (PR):
 </head>
 <body>
 <div class="code" style="counter-reset: line 109"><span class="line">    <span><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)"><span class="annotation">@0,1,2,3,4,5⦊</span>pub fn block_on&lt;F: Future&gt;(mut future: F) -&gt; F::Output {</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">        let mut future = unsafe { Pin::new_unchecked(&amp;mut future) };</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)"></span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">        static VTABLE: RawWakerVTable = RawWakerVTable::new(</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">            |_| unimplemented!("clone"),</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">            |_| unimplemented!("wake"),</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">            |_| unimplemented!("wake_by_ref"),</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">            |_| (),</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">        );</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">        let waker = unsafe { Waker::from_raw(RawWaker::new(core::ptr::null(), &amp;VTABLE)) };</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:54-111:65: @0[2]: _3 = &amp;mut _1
-111:35-111:66: @0.Call: _2 = Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
+111:35-111:66: @0.Call: _2 = std::pin::Pin::&lt;&amp;mut F&gt;::new_unchecked(move _3) -&gt; [return: bb1, unwind: bb20]
 111:13-111:23: @1[1]: FakeRead(ForLet, _2)
-119:60-119:77: @1.Call: _6 = null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
-119:80-119:86: @2[3]: _9 = const {alloc0: &amp;RawWakerVTable}
+119:60-119:77: @1.Call: _6 = std::ptr::null::&lt;()&gt;() -&gt; [return: bb2, unwind: bb20]
+119:80-119:86: @2[3]: _9 = const {alloc0: &amp;std::task::RawWakerVTable}
 119:79-119:86: @2[4]: _8 = &amp;(*_9)
 119:79-119:86: @2[5]: _7 = &amp;(*_8)
-119:46-119:87: @2.Call: _5 = RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
-119:30-119:88: @3.Call: _4 = Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
+119:46-119:87: @2.Call: _5 = std::task::RawWaker::new(move _6, move _7) -&gt; [return: bb3, unwind: bb20]
+119:30-119:88: @3.Call: _4 = std::task::Waker::from_raw(move _5) -&gt; [return: bb4, unwind: bb20]
 119:13-119:18: @4[1]: FakeRead(ForLet, _4)
 120:47-120:53: @4[7]: _12 = &amp;_4
 120:47-120:53: @4[8]: _11 = &amp;(*_12)
-120:27-120:54: @4.Call: _10 = Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
+120:27-120:54: @4.Call: _10 = std::task::Context::from_waker(move _11) -&gt; [return: bb5, unwind: bb19]
 120:13-120:24: @5[1]: FakeRead(ForLet, _10)">        let mut context = Context::from_waker(&amp;waker)<span class="annotation">⦉@0,1,2,3,4,5</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">        loop {</span></span>
 <span class="line"><span class="code" style="--layer: 0">            if let Poll::Ready(</span><span><span class="code odd" style="--layer: 1" title="123:32-123:35: @12[1]: _20 = move ((_14 as Ready).0: &lt;F as std::future::Future&gt;::Output)"><span class="annotation">@10,12,14,15,16,17⦊</span>val<span class="annotation">⦉@10,12,14,15,16,17</span></span></span><span class="code" style="--layer: 0">) = </span><span><span class="code even" style="--layer: 1" title="123:39-123:45: @7[3]: _16 = &amp;mut _2
-123:39-123:54: @7.Call: _15 = Pin::&lt;&amp;mut F&gt;::as_mut(move _16) -&gt; [return: bb8, unwind: bb19]
+123:39-123:54: @7.Call: _15 = std::pin::Pin::&lt;&amp;mut F&gt;::as_mut(move _16) -&gt; [return: bb8, unwind: bb19]
 123:60-123:72: @8[3]: _18 = &amp;mut _10
 123:60-123:72: @8[4]: _17 = &amp;mut (*_18)
-123:39-123:73: @8.Call: _14 = &lt;F as Future&gt;::poll(move _15, move _17) -&gt; [return: bb9, unwind: bb19]
+123:39-123:73: @8.Call: _14 = &lt;F as std::future::Future&gt;::poll(move _15, move _17) -&gt; [return: bb9, unwind: bb19]
 123:39-123:73: @9[2]: FakeRead(ForMatchedPlace, _14)"><span class="annotation">@6,7,8,9⦊</span>future.as_mut().poll(&amp;mut context)<span class="annotation">⦉@6,7,8,9</span></span></span><span class="code" style="--layer: 0"> {</span></span>
 <span class="line"><span class="code" style="--layer: 0">                break </span><span><span class="code odd" style="--layer: 1" title="124:23-124:26: @12[2]: _0 = move _20"><span class="annotation">@10,12,14,15,16,17⦊</span>val<span class="annotation">⦉@10,12,14,15,16,17</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">            }</span><span><span class="code even" style="--layer: 1" title="125:14-125:14: @11[0]: _13 = const ()"><span class="annotation">@11,13⦊</span>‸<span class="annotation">⦉@11,13</span></span></span><span class="code" style="--layer: 0"></span></span>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.main.-------.InstrumentCoverage.0.html
index 313a36ed6c2..b892af0ed37 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.async/async.main.-------.InstrumentCoverage.0.html
@@ -72,118 +72,118 @@ For revisions in Pull Requests (PR):
 <div class="code" style="counter-reset: line 92"><span class="line"><span><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13⦊</span>fn main() {</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">    let _ = g(10);</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">    let _ = h(9);</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">    let mut future = Box::pin(i(8));</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">    j(7);</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">    l(6);</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">    let _ = m(5);</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">    executor::block_on(future.as_mut());</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="94:13-94:18: @0.Call: _1 = g(const 10_u8) -&gt; [return: bb1, unwind: bb16]
 95:13-95:17: @2.Call: _2 = h(const 9_usize) -&gt; [return: bb3, unwind: bb16]
 96:31-96:35: @4.Call: _4 = i(const 8_u8) -&gt; [return: bb5, unwind: bb16]
-96:22-96:36: @5.Call: _3 = Box::&lt;impl Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
+96:22-96:36: @5.Call: _3 = std::boxed::Box::&lt;impl std::future::Future&gt;::pin(move _4) -&gt; [return: bb6, unwind: bb15]
 96:9-96:19: @6[1]: FakeRead(ForLet, _3)
 97:5-97:9: @6.Call: _5 = j(const 7_u8) -&gt; [return: bb7, unwind: bb14]
 98:5-98:9: @7.Call: _6 = l(const 6_u8) -&gt; [return: bb8, unwind: bb14]
 99:13-99:17: @8.Call: _7 = m(const 5_u8) -&gt; [return: bb9, unwind: bb14]
 100:24-100:30: @10[4]: _10 = &amp;mut _3
-100:24-100:39: @10.Call: _9 = Pin::&lt;Box&lt;impl Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
-100:5-100:40: @11.Call: _8 = block_on::&lt;Pin&lt;&amp;mut impl Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
+100:24-100:39: @10.Call: _9 = std::pin::Pin::&lt;std::boxed::Box&lt;impl std::future::Future&gt;&gt;::as_mut(move _10) -&gt; [return: bb11, unwind: bb14]
+100:5-100:40: @11.Call: _8 = executor::block_on::&lt;std::pin::Pin&lt;&amp;mut impl std::future::Future&gt;&gt;(move _9) -&gt; [return: bb12, unwind: bb14]
 93:11-101:2: @12[2]: _0 = const ()
 101:2-101:2: @13.Return: return">}<span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#0}.-------.InstrumentCoverage.0.html
index b4b171dc955..3998295a052 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#0}.-------.InstrumentCoverage.0.html
@@ -86,11 +86,11 @@ For revisions in Pull Requests (PR):
 36:21-38:10: @1[1]: _3 = const ()">        }<span class="annotation">⦉@1</span></span></span><span><span class="code even" style="--layer: 1" title="38:10-38:10: @2[0]: _3 = const ()"><span class="annotation">@2⦊</span>‸<span class="annotation">⦉@2</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code odd" style="--layer: 1" title="39:9-39:23: @3[4]: _6 = const &quot;alt string 2&quot;
 39:9-39:23: @3[5]: _5 = &amp;(*_6)
-39:9-39:34: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+39:9-39:34: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 40:6-40:6: @4.Return: return"><span class="annotation">@3,4⦊</span>"alt string 2".to_owned()</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="39:9-39:23: @3[4]: _6 = const &quot;alt string 2&quot;
 39:9-39:23: @3[5]: _5 = &amp;(*_6)
-39:9-39:34: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+39:9-39:34: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 40:6-40:6: @4.Return: return">    }<span class="annotation">⦉@3,4</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#10}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#10}.-------.InstrumentCoverage.0.html
index c1edc3eb929..3bdfe71b48c 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#10}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#10}.-------.InstrumentCoverage.0.html
@@ -86,11 +86,11 @@ For revisions in Pull Requests (PR):
 21:29-23:18: @1[1]: _3 = const ()">                }<span class="annotation">⦉@1</span></span></span><span><span class="code even" style="--layer: 1" title="23:18-23:18: @2[0]: _3 = const ()"><span class="annotation">@2⦊</span>‸<span class="annotation">⦉@2</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">                </span><span><span class="code odd" style="--layer: 1" title="24:17-24:31: @3[4]: _6 = const &quot;alt string 1&quot;
 24:17-24:31: @3[5]: _5 = &amp;(*_6)
-24:17-24:42: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+24:17-24:42: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 25:14-25:14: @4.Return: return"><span class="annotation">@3,4⦊</span>"alt string 1".to_owned()</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="24:17-24:31: @3[4]: _6 = const &quot;alt string 1&quot;
 24:17-24:31: @3[5]: _5 = &amp;(*_6)
-24:17-24:42: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+24:17-24:42: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 25:14-25:14: @4.Return: return">            }<span class="annotation">⦉@3,4</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#11}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#11}.-------.InstrumentCoverage.0.html
index 24c1cadacac..4b3f04b5a0c 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#11}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#11}.-------.InstrumentCoverage.0.html
@@ -86,11 +86,11 @@ For revisions in Pull Requests (PR):
 63:29-65:18: @1[1]: _3 = const ()">                }<span class="annotation">⦉@1</span></span></span><span><span class="code even" style="--layer: 1" title="65:18-65:18: @2[0]: _3 = const ()"><span class="annotation">@2⦊</span>‸<span class="annotation">⦉@2</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">                </span><span><span class="code odd" style="--layer: 1" title="66:17-66:31: @3[4]: _6 = const &quot;alt string 3&quot;
 66:17-66:31: @3[5]: _5 = &amp;(*_6)
-66:17-66:42: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+66:17-66:42: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 67:14-67:14: @4.Return: return"><span class="annotation">@3,4⦊</span>"alt string 3".to_owned()</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="66:17-66:31: @3[4]: _6 = const &quot;alt string 3&quot;
 66:17-66:31: @3[5]: _5 = &amp;(*_6)
-66:17-66:42: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+66:17-66:42: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 67:14-67:14: @4.Return: return">            }<span class="annotation">⦉@3,4</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#1}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#1}.-------.InstrumentCoverage.0.html
index 7a3921c5aec..8ae494178f7 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#1}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#1}.-------.InstrumentCoverage.0.html
@@ -86,11 +86,11 @@ For revisions in Pull Requests (PR):
 78:21-80:10: @1[1]: _3 = const ()">        }<span class="annotation">⦉@1</span></span></span><span><span class="code even" style="--layer: 1" title="80:10-80:10: @2[0]: _3 = const ()"><span class="annotation">@2⦊</span>‸<span class="annotation">⦉@2</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code odd" style="--layer: 1" title="81:9-81:23: @3[4]: _6 = const &quot;alt string 4&quot;
 81:9-81:23: @3[5]: _5 = &amp;(*_6)
-81:9-81:34: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+81:9-81:34: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 82:6-82:6: @4.Return: return"><span class="annotation">@3,4⦊</span>"alt string 4".to_owned()</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="81:9-81:23: @3[4]: _6 = const &quot;alt string 4&quot;
 81:9-81:23: @3[5]: _5 = &amp;(*_6)
-81:9-81:34: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+81:9-81:34: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 82:6-82:6: @4.Return: return">    }<span class="annotation">⦉@3,4</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#2}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#2}.-------.InstrumentCoverage.0.html
index 5071842aa1e..ad40ba57d69 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#2}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#2}.-------.InstrumentCoverage.0.html
@@ -94,13 +94,13 @@ For revisions in Pull Requests (PR):
 103:9-103:29: @3[23]: _18 = (_16.0: &amp;&amp;str)
 103:9-103:29: @3[26]: _20 = &amp;(*_18)
 103:9-103:29: @3[28]: _21 = &lt;&amp;str as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;str, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-103:9-103:29: @3.Call: _19 = ArgumentV1::new::&lt;&amp;str&gt;(move _20, move _21) -&gt; [return: bb4, unwind: bb8]
+103:9-103:29: @3.Call: _19 = std::fmt::ArgumentV1::new::&lt;&amp;str&gt;(move _20, move _21) -&gt; [return: bb4, unwind: bb8]
 103:9-103:29: @4[2]: _15 = [move _19]
 103:9-103:29: @4[5]: _14 = &amp;_15
 103:9-103:29: @4[6]: _13 = &amp;(*_14)
 103:9-103:29: @4[7]: _12 = move _13 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-103:9-103:29: @4.Call: _7 = Arguments::new_v1(move _8, move _12) -&gt; [return: bb5, unwind: bb8]
-103:9-103:29: @5.Call: _6 = format(move _7) -&gt; [return: bb6, unwind: bb8]
+103:9-103:29: @4.Call: _7 = std::fmt::Arguments::new_v1(move _8, move _12) -&gt; [return: bb5, unwind: bb8]
+103:9-103:29: @5.Call: _6 = std::fmt::format(move _7) -&gt; [return: bb6, unwind: bb8]
 103:9-103:29: @6[1]: FakeRead(ForLet, _6)
 103:9-103:29: @6[6]: _0 = move _6
 104:6-104:6: @7.Return: return"><span class="annotation">@3,4,5,6,7⦊</span>format!("'{}'", val)</span></span>
@@ -114,13 +114,13 @@ For revisions in Pull Requests (PR):
 103:9-103:29: @3[23]: _18 = (_16.0: &amp;&amp;str)
 103:9-103:29: @3[26]: _20 = &amp;(*_18)
 103:9-103:29: @3[28]: _21 = &lt;&amp;str as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;str, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-103:9-103:29: @3.Call: _19 = ArgumentV1::new::&lt;&amp;str&gt;(move _20, move _21) -&gt; [return: bb4, unwind: bb8]
+103:9-103:29: @3.Call: _19 = std::fmt::ArgumentV1::new::&lt;&amp;str&gt;(move _20, move _21) -&gt; [return: bb4, unwind: bb8]
 103:9-103:29: @4[2]: _15 = [move _19]
 103:9-103:29: @4[5]: _14 = &amp;_15
 103:9-103:29: @4[6]: _13 = &amp;(*_14)
 103:9-103:29: @4[7]: _12 = move _13 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-103:9-103:29: @4.Call: _7 = Arguments::new_v1(move _8, move _12) -&gt; [return: bb5, unwind: bb8]
-103:9-103:29: @5.Call: _6 = format(move _7) -&gt; [return: bb6, unwind: bb8]
+103:9-103:29: @4.Call: _7 = std::fmt::Arguments::new_v1(move _8, move _12) -&gt; [return: bb5, unwind: bb8]
+103:9-103:29: @5.Call: _6 = std::fmt::format(move _7) -&gt; [return: bb6, unwind: bb8]
 103:9-103:29: @6[1]: FakeRead(ForLet, _6)
 103:9-103:29: @6[6]: _0 = move _6
 104:6-104:6: @7.Return: return">    }<span class="annotation">⦉@3,4,5,6,7</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#3}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#3}.-------.InstrumentCoverage.0.html
index 09407758400..23101d76a8e 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#3}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#3}.-------.InstrumentCoverage.0.html
@@ -81,11 +81,11 @@ For revisions in Pull Requests (PR):
 124:21-126:10: @1[1]: _3 = const ()">        }<span class="annotation">⦉@1</span></span></span><span><span class="code even" style="--layer: 1" title="126:10-126:10: @2[0]: _3 = const ()"><span class="annotation">@2⦊</span>‸<span class="annotation">⦉@2</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code odd" style="--layer: 1" title="127:9-127:35: @3[4]: _6 = const &quot;closure should be unused&quot;
 127:9-127:35: @3[5]: _5 = &amp;(*_6)
-127:9-127:46: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+127:9-127:46: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 128:6-128:6: @4.Return: return"><span class="annotation">@3,4⦊</span>"closure should be unused".to_owned()</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="127:9-127:35: @3[4]: _6 = const &quot;closure should be unused&quot;
 127:9-127:35: @3[5]: _5 = &amp;(*_6)
-127:9-127:46: @3.Call: _0 = &lt;str as ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
+127:9-127:46: @3.Call: _0 = &lt;str as std::borrow::ToOwned&gt;::to_owned(move _5) -&gt; [return: bb4, unwind: bb5]
 128:6-128:6: @4.Return: return">    }<span class="annotation">⦉@3,4</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#5}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#5}.-------.InstrumentCoverage.0.html
index 9ff7a13522a..8ba7a6187fd 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#5}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#5}.-------.InstrumentCoverage.0.html
@@ -79,8 +79,8 @@ For revisions in Pull Requests (PR):
 112:28-112:61: @0[17]: _11 = &amp;(*_14)
 112:28-112:61: @0[18]: _10 = &amp;(*_11)
 112:28-112:61: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-112:28-112:61: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-112:9-112:62: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+112:28-112:61: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+112:9-112:62: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 111:23-113:6: @2[5]: _0 = const ()
 111:23-113:6: @2.Return: return"><span class="annotation">@0,1,2⦊</span>{</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:23-113:6: @0[5]: _15 = const main::{closure#5}::promoted[1]
@@ -93,8 +93,8 @@ For revisions in Pull Requests (PR):
 112:28-112:61: @0[17]: _11 = &amp;(*_14)
 112:28-112:61: @0[18]: _10 = &amp;(*_11)
 112:28-112:61: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-112:28-112:61: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-112:9-112:62: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+112:28-112:61: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+112:9-112:62: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 111:23-113:6: @2[5]: _0 = const ()
 111:23-113:6: @2.Return: return">        $crate::io::_print($crate::format_args_nl!($($arg)*));</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="111:23-113:6: @0[5]: _15 = const main::{closure#5}::promoted[1]
@@ -107,8 +107,8 @@ For revisions in Pull Requests (PR):
 112:28-112:61: @0[17]: _11 = &amp;(*_14)
 112:28-112:61: @0[18]: _10 = &amp;(*_11)
 112:28-112:61: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-112:28-112:61: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-112:9-112:62: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+112:28-112:61: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+112:9-112:62: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 111:23-113:6: @2[5]: _0 = const ()
 111:23-113:6: @2.Return: return">    }<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#6}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#6}.-------.InstrumentCoverage.0.html
index d479211aa37..74c75c6c46c 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#6}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#6}.-------.InstrumentCoverage.0.html
@@ -79,8 +79,8 @@ For revisions in Pull Requests (PR):
 141:61-141:83: @0[17]: _11 = &amp;(*_14)
 141:61-141:83: @0[18]: _10 = &amp;(*_11)
 141:61-141:83: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-141:61-141:83: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-141:61-141:83: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+141:61-141:83: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+141:61-141:83: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 141:61-141:83: @2[5]: _0 = const ()
 141:85-141:85: @2.Return: return"><span class="annotation">@0,1,2⦊</span>{ println!("not called") }<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#7}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#7}.-------.InstrumentCoverage.0.html
index 2734c0b2468..386fb1b9e6f 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#7}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#7}.-------.InstrumentCoverage.0.html
@@ -79,8 +79,8 @@ For revisions in Pull Requests (PR):
 144:9-144:31: @0[17]: _11 = &amp;(*_14)
 144:9-144:31: @0[18]: _10 = &amp;(*_11)
 144:9-144:31: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-144:9-144:31: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-144:9-144:31: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+144:9-144:31: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+144:9-144:31: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 144:9-144:31: @2[5]: _0 = const ()
 145:6-145:6: @2.Return: return"><span class="annotation">@0,1,2⦊</span>{</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="144:18-144:30: @0[5]: _15 = const main::{closure#7}::promoted[1]
@@ -93,8 +93,8 @@ For revisions in Pull Requests (PR):
 144:9-144:31: @0[17]: _11 = &amp;(*_14)
 144:9-144:31: @0[18]: _10 = &amp;(*_11)
 144:9-144:31: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-144:9-144:31: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-144:9-144:31: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+144:9-144:31: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+144:9-144:31: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 144:9-144:31: @2[5]: _0 = const ()
 145:6-145:6: @2.Return: return">        println!("not called")</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="144:18-144:30: @0[5]: _15 = const main::{closure#7}::promoted[1]
@@ -107,8 +107,8 @@ For revisions in Pull Requests (PR):
 144:9-144:31: @0[17]: _11 = &amp;(*_14)
 144:9-144:31: @0[18]: _10 = &amp;(*_11)
 144:9-144:31: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-144:9-144:31: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-144:9-144:31: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+144:9-144:31: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+144:9-144:31: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 144:9-144:31: @2[5]: _0 = const ()
 145:6-145:6: @2.Return: return">    }<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#8}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#8}.-------.InstrumentCoverage.0.html
index a032df54ea2..f9da6ac9dfc 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#8}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#8}.-------.InstrumentCoverage.0.html
@@ -81,8 +81,8 @@ For revisions in Pull Requests (PR):
 149:9-149:31: @0[17]: _11 = &amp;(*_14)
 149:9-149:31: @0[18]: _10 = &amp;(*_11)
 149:9-149:31: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-149:9-149:31: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-149:9-149:31: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+149:9-149:31: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+149:9-149:31: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 149:9-149:31: @2[5]: _0 = const ()
 149:33-149:33: @2.Return: return"><span class="annotation">@0,1,2⦊</span>{ println!("not called") }<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#9}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#9}.-------.InstrumentCoverage.0.html
index 3c174e03ebe..e259fc9bb67 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#9}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main-{closure#9}.-------.InstrumentCoverage.0.html
@@ -81,8 +81,8 @@ For revisions in Pull Requests (PR):
 153:9-153:31: @0[17]: _11 = &amp;(*_14)
 153:9-153:31: @0[18]: _10 = &amp;(*_11)
 153:9-153:31: @0[19]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-153:9-153:31: @0.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
-153:9-153:31: @1.Call: _3 = _print(move _4) -&gt; [return: bb2, unwind: bb3]
+153:9-153:31: @0.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb1, unwind: bb3]
+153:9-153:31: @1.Call: _3 = std::io::_print(move _4) -&gt; [return: bb2, unwind: bb3]
 153:9-153:31: @2[5]: _0 = const ()
 153:33-153:33: @2.Return: return"><span class="annotation">@0,1,2⦊</span>{ println!("not called") }<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main.-------.InstrumentCoverage.0.html
index 702c7937064..a7d1728114e 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.closure/closure.main.-------.InstrumentCoverage.0.html
@@ -69,516 +69,516 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    let is_false = ! is_true;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    let mut some_string = Some(String::from("the string content"));</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    println!(</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        "The string or alt: {}"</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        ,</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        some_string</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            .</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            unwrap_or_else</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        (</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">||</span></span>
 <span class="line"><span class="code" style="--layer: 0">            {</span></span>
@@ -587,327 +587,327 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">                    countdown = 10;</span></span>
 <span class="line"><span class="code" style="--layer: 0">                }</span></span>
 <span class="line"><span class="code" style="--layer: 0">                "alt string 1".to_owned()</span></span>
-<span class="line"><span class="code" style="--layer: 0">            }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">            }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()">        )</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()">    );</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()">    some_string = Some(String::from("the string content"));</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()">    let</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()">        a</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()">    =</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 3:11-155:2: @41[38]: _0 = const ()">        <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">||</span></span>
@@ -917,39 +917,39 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">            countdown = 10;</span></span>
 <span class="line"><span class="code" style="--layer: 0">        }</span></span>
 <span class="line"><span class="code" style="--layer: 0">        "alt string 2".to_owned()</span></span>
-<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -958,76 +958,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1036,76 +1036,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    println!(</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1114,76 +1114,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        "The string or alt: {}"</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1192,76 +1192,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        ,</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1270,76 +1270,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        some_string</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1348,76 +1348,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            .</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1426,76 +1426,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            unwrap_or_else</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1504,76 +1504,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        (</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1582,76 +1582,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            a</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1660,76 +1660,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        )</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1738,76 +1738,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    );</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1816,76 +1816,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1894,76 +1894,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    some_string = None;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -1972,76 +1972,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">    println!(</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2050,76 +2050,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        "The string or alt: {}"</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2128,76 +2128,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        ,</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2206,76 +2206,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        some_string</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2284,76 +2284,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            .</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2362,76 +2362,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            unwrap_or_else</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2440,76 +2440,76 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">        (</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2518,41 +2518,41 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
 3:11-155:2: @41[38]: _0 = const ()">            <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">||</span></span>
 <span class="line"><span class="code" style="--layer: 0">            {</span></span>
@@ -2561,39 +2561,39 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">                    countdown = 10;</span></span>
 <span class="line"><span class="code" style="--layer: 0">                }</span></span>
 <span class="line"><span class="code" style="--layer: 0">                "alt string 3".to_owned()</span></span>
-<span class="line"><span class="code" style="--layer: 0">            }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">            }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2602,79 +2602,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2683,79 +2683,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()">        )</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2764,79 +2764,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()">    );</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2845,79 +2845,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -2926,79 +2926,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()">    some_string = None;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3007,79 +3007,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()">    let</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3088,79 +3088,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()">        a</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3169,79 +3169,79 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()">    =</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3250,43 +3250,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 3:11-155:2: @41[38]: _0 = const ()">        <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">||</span></span>
@@ -3296,39 +3296,39 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">            countdown = 10;</span></span>
 <span class="line"><span class="code" style="--layer: 0">        }</span></span>
 <span class="line"><span class="code" style="--layer: 0">        "alt string 4".to_owned()</span></span>
-<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3337,43 +3337,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -3382,57 +3382,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3441,43 +3441,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -3486,57 +3486,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">    println!(</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3545,43 +3545,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -3590,57 +3590,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">        "The string or alt: {}"</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3649,43 +3649,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -3694,57 +3694,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">        ,</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3753,43 +3753,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -3798,57 +3798,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">        some_string</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3857,43 +3857,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -3902,57 +3902,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">            .</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -3961,43 +3961,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4006,57 +4006,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">            unwrap_or_else</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4065,43 +4065,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4110,57 +4110,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">        (</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4169,43 +4169,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4214,57 +4214,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">            a</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4273,43 +4273,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4318,57 +4318,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">        )</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4377,43 +4377,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4422,57 +4422,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">    );</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4481,43 +4481,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4526,57 +4526,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4585,43 +4585,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4630,57 +4630,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">    let</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4689,43 +4689,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4734,57 +4734,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">        quote_closure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4793,43 +4793,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4838,57 +4838,57 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
 3:11-155:2: @41[38]: _0 = const ()">    =</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -4897,43 +4897,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -4942,20 +4942,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -4966,39 +4966,39 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">            countdown = 10;</span></span>
 <span class="line"><span class="code" style="--layer: 0">        }</span></span>
 <span class="line"><span class="code" style="--layer: 0">        format!("'{}'", val)</span></span>
-<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5007,43 +5007,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5052,20 +5052,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5074,59 +5074,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5135,43 +5135,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5180,20 +5180,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5202,59 +5202,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">    println!(</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5263,43 +5263,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5308,20 +5308,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5330,59 +5330,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">        "Repeated, quoted string: {:?}"</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5391,43 +5391,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5436,20 +5436,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5458,59 +5458,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">        ,</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5519,43 +5519,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5564,20 +5564,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5586,59 +5586,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">        std::iter::repeat("repeat me")</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5647,43 +5647,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5692,20 +5692,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5714,59 +5714,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">            .take(5)</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5775,43 +5775,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5820,20 +5820,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5842,59 +5842,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">            .map</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -5903,43 +5903,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -5948,20 +5948,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -5970,59 +5970,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">        (</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6031,43 +6031,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6076,20 +6076,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6098,59 +6098,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">            quote_closure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6159,43 +6159,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6204,20 +6204,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6226,59 +6226,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">        )</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6287,43 +6287,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6332,20 +6332,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6354,59 +6354,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">            .collect::&lt;Vec&lt;_&gt;&gt;()</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6415,43 +6415,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6460,20 +6460,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6482,59 +6482,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">    );</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6543,43 +6543,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6588,20 +6588,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6610,59 +6610,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6671,43 +6671,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6716,20 +6716,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6738,59 +6738,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">    let</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6799,43 +6799,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6844,20 +6844,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6866,59 +6866,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">        _unused_closure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -6927,43 +6927,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -6972,20 +6972,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -6994,59 +6994,59 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">    =</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7055,43 +7055,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -7100,20 +7100,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -7122,23 +7122,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 3:11-155:2: @41[38]: _0 = const ()">        <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">|</span></span>
@@ -7149,39 +7149,39 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">            countdown = 10;</span></span>
 <span class="line"><span class="code" style="--layer: 0">        }</span></span>
 <span class="line"><span class="code" style="--layer: 0">        "closure should be unused".to_owned()</span></span>
-<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7190,43 +7190,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -7235,20 +7235,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -7257,23 +7257,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -7281,39 +7281,39 @@ For revisions in Pull Requests (PR):
 131:33-131:67: @41[19]: _127 = &amp;mut _125
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7322,43 +7322,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -7367,20 +7367,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -7389,23 +7389,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -7413,39 +7413,39 @@ For revisions in Pull Requests (PR):
 131:33-131:67: @41[19]: _127 = &amp;mut _125
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7454,43 +7454,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -7499,20 +7499,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -7521,23 +7521,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -7545,39 +7545,39 @@ For revisions in Pull Requests (PR):
 131:33-131:67: @41[19]: _127 = &amp;mut _125
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 3:11-155:2: @41[38]: _0 = const ()">    let mut countdown = 10;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7586,43 +7586,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -7631,20 +7631,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -7653,62 +7653,62 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
 130:9-130:22: @41[16]: FakeRead(ForLet, _125)
 131:33-131:67: @41[19]: _127 = &amp;mut _125
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
-3:11-155:2: @41[38]: _0 = const ()">    let _short_unused_closure = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">| _unused_arg: u8 | countdown += 1</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+3:11-155:2: @41[38]: _0 = const ()">    let _short_unused_closure = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">| _unused_arg: u8 | countdown += 1</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7717,43 +7717,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -7762,20 +7762,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -7784,23 +7784,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -7809,39 +7809,39 @@ For revisions in Pull Requests (PR):
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7850,43 +7850,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -7895,20 +7895,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -7917,23 +7917,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -7942,39 +7942,39 @@ For revisions in Pull Requests (PR):
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -7983,43 +7983,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8028,20 +8028,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8050,23 +8050,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -8075,39 +8075,39 @@ For revisions in Pull Requests (PR):
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 3:11-155:2: @41[38]: _0 = const ()">    // Macros can sometimes confuse the coverage results. Compare this next assignment, with an</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -8116,43 +8116,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8161,20 +8161,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8183,23 +8183,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -8208,39 +8208,39 @@ For revisions in Pull Requests (PR):
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 3:11-155:2: @41[38]: _0 = const ()">    // unused closure that invokes the `println!()` macro, with the closure assignment above, that</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -8249,43 +8249,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8294,20 +8294,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8316,23 +8316,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -8341,39 +8341,39 @@ For revisions in Pull Requests (PR):
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 3:11-155:2: @41[38]: _0 = const ()">    // does not use a macro. The closure above correctly shows `0` executions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -8382,43 +8382,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8427,20 +8427,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8449,23 +8449,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -8473,39 +8473,39 @@ For revisions in Pull Requests (PR):
 131:33-131:67: @41[19]: _127 = &amp;mut _125
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
-3:11-155:2: @41[38]: _0 = const ()">    let _short_unused_closure = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">| _unused_arg: u8 | println!("not called")</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+3:11-155:2: @41[38]: _0 = const ()">    let _short_unused_closure = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">| _unused_arg: u8 | println!("not called")</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -8514,43 +8514,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8559,20 +8559,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8581,23 +8581,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -8607,39 +8607,39 @@ For revisions in Pull Requests (PR):
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -8648,43 +8648,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8693,20 +8693,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8715,23 +8715,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -8741,39 +8741,39 @@ For revisions in Pull Requests (PR):
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
 3:11-155:2: @41[38]: _0 = const ()">    // The closure assignment above is executed, with a line count of `1`, but the `println!()`</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -8782,43 +8782,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8827,20 +8827,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8849,23 +8849,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -8875,39 +8875,39 @@ For revisions in Pull Requests (PR):
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
 3:11-155:2: @41[38]: _0 = const ()">    // could not have been called, and yet, there is no indication that it wasn't...</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -8916,43 +8916,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -8961,20 +8961,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -8983,23 +8983,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9009,39 +9009,39 @@ For revisions in Pull Requests (PR):
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9050,43 +9050,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -9095,20 +9095,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -9117,23 +9117,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9143,39 +9143,39 @@ For revisions in Pull Requests (PR):
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
 3:11-155:2: @41[38]: _0 = const ()">    // ...but adding block braces gives the expected result, showing the block was not executed.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9184,43 +9184,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -9229,20 +9229,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -9251,23 +9251,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9276,39 +9276,39 @@ For revisions in Pull Requests (PR):
 131:9-131:30: @41[22]: FakeRead(ForLet, _126)
 136:9-136:30: @41[25]: FakeRead(ForLet, _128)
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
-3:11-155:2: @41[38]: _0 = const ()">    let _short_unused_closure_block = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">| _unused_arg: u8 | { println!("not called") }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+3:11-155:2: @41[38]: _0 = const ()">    let _short_unused_closure_block = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">| _unused_arg: u8 | { println!("not called") }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9317,43 +9317,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -9362,20 +9362,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -9384,23 +9384,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9411,39 +9411,39 @@ For revisions in Pull Requests (PR):
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
 143:9-143:33: @41[31]: FakeRead(ForLet, _130)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9452,43 +9452,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -9497,20 +9497,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -9519,23 +9519,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9546,39 +9546,39 @@ For revisions in Pull Requests (PR):
 141:9-141:36: @41[28]: FakeRead(ForLet, _129)
 143:9-143:33: @41[31]: FakeRead(ForLet, _130)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9587,43 +9587,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -9632,20 +9632,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -9654,23 +9654,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9682,39 +9682,39 @@ For revisions in Pull Requests (PR):
 143:9-143:33: @41[31]: FakeRead(ForLet, _130)
 3:11-155:2: @41[38]: _0 = const ()">    let _shortish_unused_closure = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">| _unused_arg: u8 | {</span></span>
 <span class="line"><span class="code" style="--layer: 0">        println!("not called")</span></span>
-<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9723,43 +9723,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -9768,20 +9768,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -9790,23 +9790,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9818,39 +9818,39 @@ For revisions in Pull Requests (PR):
 143:9-143:33: @41[31]: FakeRead(ForLet, _130)
 147:9-147:33: @41[34]: FakeRead(ForLet, _131)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9859,43 +9859,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -9904,20 +9904,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -9926,23 +9926,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -9954,39 +9954,39 @@ For revisions in Pull Requests (PR):
 143:9-143:33: @41[31]: FakeRead(ForLet, _130)
 147:9-147:33: @41[34]: FakeRead(ForLet, _131)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -9995,43 +9995,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -10040,20 +10040,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -10062,23 +10062,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -10091,39 +10091,39 @@ For revisions in Pull Requests (PR):
 147:9-147:33: @41[34]: FakeRead(ForLet, _131)
 3:11-155:2: @41[38]: _0 = const ()">    let _as_short_unused_closure = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">|</span></span>
 <span class="line"><span class="code" style="--layer: 0">        _unused_arg: u8</span></span>
-<span class="line"><span class="code" style="--layer: 0">    | { println!("not called") }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">    | { println!("not called") }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -10132,43 +10132,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -10177,20 +10177,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -10199,23 +10199,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -10228,39 +10228,39 @@ For revisions in Pull Requests (PR):
 147:9-147:33: @41[34]: FakeRead(ForLet, _131)
 151:9-151:40: @41[37]: FakeRead(ForLet, _132)
 3:11-155:2: @41[38]: _0 = const ()"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span>;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -10269,43 +10269,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -10314,20 +10314,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -10336,23 +10336,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -10365,39 +10365,39 @@ For revisions in Pull Requests (PR):
 147:9-147:33: @41[34]: FakeRead(ForLet, _131)
 151:9-151:40: @41[37]: FakeRead(ForLet, _132)
 3:11-155:2: @41[38]: _0 = const ()"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -10406,43 +10406,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -10451,20 +10451,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -10473,23 +10473,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -10503,39 +10503,39 @@ For revisions in Pull Requests (PR):
 151:9-151:40: @41[37]: FakeRead(ForLet, _132)
 3:11-155:2: @41[38]: _0 = const ()">    let _almost_as_short_unused_closure = <span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42</span></span></span><span class="code" style="--layer: 0">|</span></span>
 <span class="line"><span class="code" style="--layer: 0">        _unused_arg: u8</span></span>
-<span class="line"><span class="code" style="--layer: 0">    | { println!("not called") }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code" style="--layer: 0">    | { println!("not called") }</span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -10544,43 +10544,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -10589,20 +10589,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -10611,23 +10611,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -10641,39 +10641,39 @@ For revisions in Pull Requests (PR):
 151:9-151:40: @41[37]: FakeRead(ForLet, _132)
 3:11-155:2: @41[38]: _0 = const ()
 155:2-155:2: @42.Return: return"><span class="annotation">@0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42⦊</span></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -10682,43 +10682,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -10727,20 +10727,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -10749,23 +10749,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
@@ -10779,39 +10779,39 @@ For revisions in Pull Requests (PR):
 151:9-151:40: @41[37]: FakeRead(ForLet, _132)
 3:11-155:2: @41[38]: _0 = const ()
 155:2-155:2: @42.Return: return">    ;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb57]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb57]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb56]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 8:22-8:29: @3[3]: _6 = _1
 8:20-8:29: @3[4]: _5 = Not(move _6)
 8:9-8:17: @3[6]: FakeRead(ForLet, _5)
-10:32-10:66: @3.Call: _8 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
-10:27-10:67: @4[0]: _7 = Option::&lt;String&gt;::Some(move _8)
+10:32-10:66: @3.Call: _8 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb4, unwind: bb57]
+10:27-10:67: @4[0]: _7 = std::option::Option::&lt;std::string::String&gt;::Some(move _8)
 10:9-10:24: @5[1]: FakeRead(ForLet, _7)
 12:9-12:32: @5[8]: _137 = const main::promoted[4]
 12:9-12:32: @5[9]: _14 = &amp;(*_137)
 12:9-12:32: @5[10]: _13 = &amp;(*_14)
 12:9-12:32: @5[11]: _12 = move _13 as &amp;[&amp;str] (Pointer(Unsize))
 14:9-14:20: @5[21]: _23 = move _7
-14:9-26:10: @5.Call: _22 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
+14:9-26:10: @5.Call: _22 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:18:13: 25:14]&gt;(move _23, move _24) -&gt; [return: bb6, unwind: bb54]
 14:9-26:10: @6[2]: _21 = &amp;_22
 11:5-27:7: @6[3]: _20 = (move _21,)
 11:5-27:7: @6[5]: FakeRead(ForMatchedPlace, _20)
 11:5-27:7: @6[7]: _26 = (_20.0: &amp;std::string::String)
 11:5-27:7: @6[10]: _28 = &amp;(*_26)
-11:5-27:7: @6[12]: _29 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-11:5-27:7: @6.Call: _27 = ArgumentV1::new::&lt;String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
+11:5-27:7: @6[12]: _29 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+11:5-27:7: @6.Call: _27 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _28, move _29) -&gt; [return: bb7, unwind: bb53]
 11:5-27:7: @7[2]: _19 = [move _27]
 11:5-27:7: @7[5]: _18 = &amp;_19
 11:5-27:7: @7[6]: _17 = &amp;(*_18)
 11:5-27:7: @7[7]: _16 = move _17 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-27:7: @7.Call: _11 = Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
-11:5-27:7: @8.Call: _10 = _print(move _11) -&gt; [return: bb9, unwind: bb53]
+11:5-27:7: @7.Call: _11 = std::fmt::Arguments::new_v1(move _12, move _16) -&gt; [return: bb8, unwind: bb53]
+11:5-27:7: @8.Call: _10 = std::io::_print(move _11) -&gt; [return: bb9, unwind: bb53]
 11:5-27:7: @10[6]: _9 = const ()
-29:24-29:58: @10.Call: _31 = &lt;String as From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
-29:19-29:59: @11[0]: _30 = Option::&lt;String&gt;::Some(move _31)
+29:24-29:58: @10.Call: _31 = &lt;std::string::String as std::convert::From&lt;&amp;str&gt;&gt;::from(const &quot;the string content&quot;) -&gt; [return: bb11, unwind: bb55]
+29:19-29:59: @11[0]: _30 = std::option::Option::&lt;std::string::String&gt;::Some(move _31)
 33:9-40:6: @14[3]: _33 = &amp;_5
 31:9-31:10: @14[6]: FakeRead(ForLet, _32)
 42:9-42:32: @14[13]: _136 = const main::promoted[3]
@@ -10820,43 +10820,43 @@ For revisions in Pull Requests (PR):
 42:9-42:32: @14[16]: _37 = move _38 as &amp;[&amp;str] (Pointer(Unsize))
 44:9-44:20: @14[26]: _48 = move _7
 48:13-48:14: @14[28]: _49 = _32
-44:9-49:10: @14.Call: _47 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
+44:9-49:10: @14.Call: _47 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:33:9: 40:6]&gt;(move _48, move _49) -&gt; [return: bb15, unwind: bb51]
 44:9-49:10: @15[2]: _46 = &amp;_47
 41:5-50:7: @15[3]: _45 = (move _46,)
 41:5-50:7: @15[5]: FakeRead(ForMatchedPlace, _45)
 41:5-50:7: @15[7]: _50 = (_45.0: &amp;std::string::String)
 41:5-50:7: @15[10]: _52 = &amp;(*_50)
-41:5-50:7: @15[12]: _53 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-41:5-50:7: @15.Call: _51 = ArgumentV1::new::&lt;String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
+41:5-50:7: @15[12]: _53 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+41:5-50:7: @15.Call: _51 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _52, move _53) -&gt; [return: bb16, unwind: bb50]
 41:5-50:7: @16[2]: _44 = [move _51]
 41:5-50:7: @16[5]: _43 = &amp;_44
 41:5-50:7: @16[6]: _42 = &amp;(*_43)
 41:5-50:7: @16[7]: _41 = move _42 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-41:5-50:7: @16.Call: _36 = Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
-41:5-50:7: @17.Call: _35 = _print(move _36) -&gt; [return: bb18, unwind: bb50]
+41:5-50:7: @16.Call: _36 = std::fmt::Arguments::new_v1(move _37, move _41) -&gt; [return: bb17, unwind: bb50]
+41:5-50:7: @17.Call: _35 = std::io::_print(move _36) -&gt; [return: bb18, unwind: bb50]
 41:5-50:7: @19[6]: _34 = const ()
-52:19-52:23: @19[9]: _54 = Option::&lt;String&gt;::None
+52:19-52:23: @19[9]: _54 = std::option::Option::&lt;std::string::String&gt;::None
 54:9-54:32: @21[7]: _135 = const main::promoted[2]
 54:9-54:32: @21[8]: _60 = &amp;(*_135)
 54:9-54:32: @21[9]: _59 = &amp;(*_60)
 54:9-54:32: @21[10]: _58 = move _59 as &amp;[&amp;str] (Pointer(Unsize))
 56:9-56:20: @21[20]: _69 = move _7
-56:9-68:10: @21.Call: _68 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
+56:9-68:10: @21.Call: _68 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:60:13: 67:14]&gt;(move _69, move _70) -&gt; [return: bb22, unwind: bb48]
 56:9-68:10: @22[2]: _67 = &amp;_68
 53:5-69:7: @22[3]: _66 = (move _67,)
 53:5-69:7: @22[5]: FakeRead(ForMatchedPlace, _66)
 53:5-69:7: @22[7]: _72 = (_66.0: &amp;std::string::String)
 53:5-69:7: @22[10]: _74 = &amp;(*_72)
-53:5-69:7: @22[12]: _75 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-53:5-69:7: @22.Call: _73 = ArgumentV1::new::&lt;String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
+53:5-69:7: @22[12]: _75 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+53:5-69:7: @22.Call: _73 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _74, move _75) -&gt; [return: bb23, unwind: bb47]
 53:5-69:7: @23[2]: _65 = [move _73]
 53:5-69:7: @23[5]: _64 = &amp;_65
 53:5-69:7: @23[6]: _63 = &amp;(*_64)
 53:5-69:7: @23[7]: _62 = move _63 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-53:5-69:7: @23.Call: _57 = Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
-53:5-69:7: @24.Call: _56 = _print(move _57) -&gt; [return: bb25, unwind: bb47]
+53:5-69:7: @23.Call: _57 = std::fmt::Arguments::new_v1(move _58, move _62) -&gt; [return: bb24, unwind: bb47]
+53:5-69:7: @24.Call: _56 = std::io::_print(move _57) -&gt; [return: bb25, unwind: bb47]
 53:5-69:7: @26[6]: _55 = const ()
-71:19-71:23: @26[9]: _76 = Option::&lt;String&gt;::None
+71:19-71:23: @26[9]: _76 = std::option::Option::&lt;std::string::String&gt;::None
 75:9-82:6: @28[3]: _78 = &amp;_5
 73:9-73:10: @28[6]: FakeRead(ForLet, _77)
 84:9-84:32: @28[13]: _134 = const main::promoted[1]
@@ -10865,20 +10865,20 @@ For revisions in Pull Requests (PR):
 84:9-84:32: @28[16]: _82 = move _83 as &amp;[&amp;str] (Pointer(Unsize))
 86:9-86:20: @28[26]: _93 = move _7
 90:13-90:14: @28[28]: _94 = _77
-86:9-91:10: @28.Call: _92 = Option::&lt;String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
+86:9-91:10: @28.Call: _92 = std::option::Option::&lt;std::string::String&gt;::unwrap_or_else::&lt;[closure@../coverage/closure.rs:75:9: 82:6]&gt;(move _93, move _94) -&gt; [return: bb29, unwind: bb45]
 86:9-91:10: @29[2]: _91 = &amp;_92
 83:5-92:7: @29[3]: _90 = (move _91,)
 83:5-92:7: @29[5]: FakeRead(ForMatchedPlace, _90)
 83:5-92:7: @29[7]: _95 = (_90.0: &amp;std::string::String)
 83:5-92:7: @29[10]: _97 = &amp;(*_95)
-83:5-92:7: @29[12]: _98 = &lt;String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-83:5-92:7: @29.Call: _96 = ArgumentV1::new::&lt;String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
+83:5-92:7: @29[12]: _98 = &lt;std::string::String as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::string::String, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+83:5-92:7: @29.Call: _96 = std::fmt::ArgumentV1::new::&lt;std::string::String&gt;(move _97, move _98) -&gt; [return: bb30, unwind: bb44]
 83:5-92:7: @30[2]: _89 = [move _96]
 83:5-92:7: @30[5]: _88 = &amp;_89
 83:5-92:7: @30[6]: _87 = &amp;(*_88)
 83:5-92:7: @30[7]: _86 = move _87 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-83:5-92:7: @30.Call: _81 = Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
-83:5-92:7: @31.Call: _80 = _print(move _81) -&gt; [return: bb32, unwind: bb44]
+83:5-92:7: @30.Call: _81 = std::fmt::Arguments::new_v1(move _82, move _86) -&gt; [return: bb31, unwind: bb44]
+83:5-92:7: @31.Call: _80 = std::io::_print(move _81) -&gt; [return: bb32, unwind: bb44]
 83:5-92:7: @33[6]: _79 = const ()
 97:9-104:6: @33[10]: _100 = &amp;_5
 95:9-95:22: @33[13]: FakeRead(ForLet, _99)
@@ -10887,23 +10887,23 @@ For revisions in Pull Requests (PR):
 106:9-106:40: @33[22]: _105 = &amp;(*_106)
 106:9-106:40: @33[23]: _104 = move _105 as &amp;[&amp;str] (Pointer(Unsize))
 108:9-108:39: @33.Call: _117 = std::iter::repeat::&lt;&amp;str&gt;(const &quot;repeat me&quot;) -&gt; [return: bb34, unwind: bb55]
-108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
+108:9-109:21: @34.Call: _116 = &lt;std::iter::Repeat&lt;&amp;str&gt; as std::iter::Iterator&gt;::take(move _117, const 5_usize) -&gt; [return: bb35, unwind: bb55]
 112:13-112:26: @35[2]: _118 = _99
-108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as Iterator&gt;::map::&lt;String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
-108:9-114:33: @36.Call: _114 = &lt;Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as Iterator&gt;::collect::&lt;Vec&lt;String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
+108:9-113:10: @35.Call: _115 = &lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt; as std::iter::Iterator&gt;::map::&lt;std::string::String, [closure@../coverage/closure.rs:97:9: 104:6]&gt;(move _116, move _118) -&gt; [return: bb36, unwind: bb55]
+108:9-114:33: @36.Call: _114 = &lt;std::iter::Map&lt;std::iter::Take&lt;std::iter::Repeat&lt;&amp;str&gt;&gt;, [closure@../coverage/closure.rs:97:9: 104:6]&gt; as std::iter::Iterator&gt;::collect::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _115) -&gt; [return: bb37, unwind: bb55]
 108:9-114:33: @37[1]: _113 = &amp;_114
 105:5-115:7: @37[2]: _112 = (move _113,)
 105:5-115:7: @37[4]: FakeRead(ForMatchedPlace, _112)
 105:5-115:7: @37[6]: _119 = (_112.0: &amp;std::vec::Vec&lt;std::string::String&gt;)
 105:5-115:7: @37[9]: _121 = &amp;(*_119)
-105:5-115:7: @37[11]: _122 = &lt;Vec&lt;String&gt; as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-105:5-115:7: @37.Call: _120 = ArgumentV1::new::&lt;Vec&lt;String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
+105:5-115:7: @37[11]: _122 = &lt;std::vec::Vec&lt;std::string::String&gt; as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r std::vec::Vec&lt;std::string::String&gt;, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+105:5-115:7: @37.Call: _120 = std::fmt::ArgumentV1::new::&lt;std::vec::Vec&lt;std::string::String&gt;&gt;(move _121, move _122) -&gt; [return: bb38, unwind: bb43]
 105:5-115:7: @38[2]: _111 = [move _120]
 105:5-115:7: @38[5]: _110 = &amp;_111
 105:5-115:7: @38[6]: _109 = &amp;(*_110)
 105:5-115:7: @38[7]: _108 = move _109 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-105:5-115:7: @38.Call: _103 = Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
-105:5-115:7: @39.Call: _102 = _print(move _103) -&gt; [return: bb40, unwind: bb43]
+105:5-115:7: @38.Call: _103 = std::fmt::Arguments::new_v1(move _104, move _108) -&gt; [return: bb39, unwind: bb43]
+105:5-115:7: @39.Call: _102 = std::io::_print(move _103) -&gt; [return: bb40, unwind: bb43]
 105:5-115:7: @41[6]: _101 = const ()
 118:9-118:24: @41[13]: FakeRead(ForLet, _123)
 130:25-130:27: @41[15]: _125 = const 10_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.conditions/conditions.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.conditions/conditions.main.-------.InstrumentCoverage.0.html
index 184dba6abd1..0aa6fe65686 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.conditions/conditions.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.conditions/conditions.main.-------.InstrumentCoverage.0.html
@@ -87,10 +87,10 @@ For revisions in Pull Requests (PR):
 10:16-10:29: @3[6]: _5 = Gt(move _6, const 7_u32)"><span class="annotation">@3⦊</span>countdown &gt; 7<span class="annotation">⦉@3</span></span></span><span class="code" style="--layer: 0"> {</span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code odd" style="--layer: 1" title="11:9-11:23: @4[0]: _7 = CheckedSub(_1, const 4_u32)
 11:9-11:23: @6[0]: _1 = move (_7.0: u32)
-12:9-12:10: @6[1]: _4 = const B"><span class="annotation">@4,6⦊</span>countdown -= 4;</span></span>
+12:9-12:10: @6[1]: _4 = const main::B"><span class="annotation">@4,6⦊</span>countdown -= 4;</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="11:9-11:23: @4[0]: _7 = CheckedSub(_1, const 4_u32)
 11:9-11:23: @6[0]: _1 = move (_7.0: u32)
-12:9-12:10: @6[1]: _4 = const B">        B<span class="annotation">⦉@4,6</span></span></span><span class="code" style="--layer: 0"></span></span>
+12:9-12:10: @6[1]: _4 = const main::B">        B<span class="annotation">⦉@4,6</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    } else if </span><span><span class="code even" style="--layer: 1" title="13:15-13:24: @5[2]: _9 = _1
 13:15-13:28: @5[3]: _8 = Gt(move _9, const 2_u32)"><span class="annotation">@5⦊</span>countdown &gt; 2<span class="annotation">⦉@5</span></span></span><span class="code" style="--layer: 0"> {</span></span>
 <span class="line"><span class="code" style="--layer: 0">        if </span><span><span class="code odd" style="--layer: 1" title="14:12-14:21: @7[5]: _14 = _1
@@ -239,8 +239,8 @@ For revisions in Pull Requests (PR):
 73:9-73:29: @74[21]: _92 = &amp;(*_112)
 73:9-73:29: @74[22]: _91 = &amp;(*_92)
 73:9-73:29: @74[23]: _90 = move _91 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-73:9-73:29: @74.Call: _85 = Arguments::new_v1(move _86, move _90) -&gt; [return: bb87, unwind: bb112]
-73:9-73:29: @87.Call: _84 = _print(move _85) -&gt; [return: bb88, unwind: bb112]
+73:9-73:29: @74.Call: _85 = std::fmt::Arguments::new_v1(move _86, move _90) -&gt; [return: bb87, unwind: bb112]
+73:9-73:29: @87.Call: _84 = std::io::_print(move _85) -&gt; [return: bb88, unwind: bb112]
 73:9-73:29: @88[5]: _83 = const ()
 74:9-74:15: @88[7]: _0 = const ()"><span class="annotation">@74,87,88⦊</span>should_be_reachable = countdown;</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="72:35-72:44: @74[1]: _82 = _62
@@ -255,8 +255,8 @@ For revisions in Pull Requests (PR):
 73:9-73:29: @74[21]: _92 = &amp;(*_112)
 73:9-73:29: @74[22]: _91 = &amp;(*_92)
 73:9-73:29: @74[23]: _90 = move _91 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-73:9-73:29: @74.Call: _85 = Arguments::new_v1(move _86, move _90) -&gt; [return: bb87, unwind: bb112]
-73:9-73:29: @87.Call: _84 = _print(move _85) -&gt; [return: bb88, unwind: bb112]
+73:9-73:29: @74.Call: _85 = std::fmt::Arguments::new_v1(move _86, move _90) -&gt; [return: bb87, unwind: bb112]
+73:9-73:29: @87.Call: _84 = std::io::_print(move _85) -&gt; [return: bb88, unwind: bb112]
 73:9-73:29: @88[5]: _83 = const ()
 74:9-74:15: @88[7]: _0 = const ()">        println!("reached");</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="72:35-72:44: @74[1]: _82 = _62
@@ -271,8 +271,8 @@ For revisions in Pull Requests (PR):
 73:9-73:29: @74[21]: _92 = &amp;(*_112)
 73:9-73:29: @74[22]: _91 = &amp;(*_92)
 73:9-73:29: @74[23]: _90 = move _91 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-73:9-73:29: @74.Call: _85 = Arguments::new_v1(move _86, move _90) -&gt; [return: bb87, unwind: bb112]
-73:9-73:29: @87.Call: _84 = _print(move _85) -&gt; [return: bb88, unwind: bb112]
+73:9-73:29: @74.Call: _85 = std::fmt::Arguments::new_v1(move _86, move _90) -&gt; [return: bb87, unwind: bb112]
+73:9-73:29: @87.Call: _84 = std::io::_print(move _85) -&gt; [return: bb88, unwind: bb112]
 73:9-73:29: @88[5]: _83 = const ()
 74:9-74:15: @88[7]: _0 = const ()">        return<span class="annotation">⦉@74,87,88</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">    };</span></span>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.main.-------.InstrumentCoverage.0.html
index 421fe27825c..be06ddd126d 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.main.-------.InstrumentCoverage.0.html
@@ -69,65 +69,65 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 26"><span class="line"><span><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<div class="code" style="counter-reset: line 26"><span class="line"><span><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
 33:9-33:22: @3[3]: FakeRead(ForLet, _5)
 34:8-34:15: @3[5]: _6 = _1"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
 33:9-33:22: @3[3]: FakeRead(ForLet, _5)
 34:8-34:15: @3[5]: _6 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
 33:9-33:22: @3[3]: FakeRead(ForLet, _5)
 34:8-34:15: @3[5]: _6 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
 33:9-33:22: @3[3]: FakeRead(ForLet, _5)
 34:8-34:15: @3[5]: _6 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
 33:9-33:22: @3[3]: FakeRead(ForLet, _5)
 34:8-34:15: @3[5]: _6 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
 33:9-33:22: @3[3]: FakeRead(ForLet, _5)
 34:8-34:15: @3[5]: _6 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
 33:9-33:22: @3[3]: FakeRead(ForLet, _5)
 34:8-34:15: @3[5]: _6 = _1">    let mut countdown = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="31:19-31:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 31:19-31:35: @1[0]: _3 = &amp;_4
-31:19-31:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+31:19-31:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 31:19-31:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 31:9-31:16: @2[3]: FakeRead(ForLet, _1)
 33:25-33:26: @3[2]: _5 = const 0_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_fn.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_fn.-------.InstrumentCoverage.0.html
index ff3493c9f62..7f2d8d3c8ec 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_fn.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_fn.-------.InstrumentCoverage.0.html
@@ -69,65 +69,65 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 14"><span class="line"><span><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<div class="code" style="counter-reset: line 14"><span class="line"><span><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
 21:9-21:22: @3[3]: FakeRead(ForLet, _5)
 22:8-22:15: @3[5]: _6 = _1"><span class="annotation">@0,1,2,3⦊</span>fn unused_fn() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
 21:9-21:22: @3[3]: FakeRead(ForLet, _5)
 22:8-22:15: @3[5]: _6 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
 21:9-21:22: @3[3]: FakeRead(ForLet, _5)
 22:8-22:15: @3[5]: _6 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
 21:9-21:22: @3[3]: FakeRead(ForLet, _5)
 22:8-22:15: @3[5]: _6 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
 21:9-21:22: @3[3]: FakeRead(ForLet, _5)
 22:8-22:15: @3[5]: _6 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
 21:9-21:22: @3[3]: FakeRead(ForLet, _5)
 22:8-22:15: @3[5]: _6 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
 21:9-21:22: @3[3]: FakeRead(ForLet, _5)
 22:8-22:15: @3[5]: _6 = _1">    let mut countdown = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="19:19-19:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 19:19-19:35: @1[0]: _3 = &amp;_4
-19:19-19:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+19:19-19:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 19:19-19:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 19:9-19:16: @2[3]: FakeRead(ForLet, _1)
 21:25-21:26: @3[2]: _5 = const 0_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_pub_fn_not_in_library.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_pub_fn_not_in_library.-------.InstrumentCoverage.0.html
index 829113e8a71..be44f71348c 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_pub_fn_not_in_library.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.dead_code/dead_code.unused_pub_fn_not_in_library.-------.InstrumentCoverage.0.html
@@ -69,65 +69,65 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[5]: _6 = _1"><span class="annotation">@0,1,2,3⦊</span>pub fn unused_pub_fn_not_in_library() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[5]: _6 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[5]: _6 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[5]: _6 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[5]: _6 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[5]: _6 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[5]: _6 = _1">    let mut countdown = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest/doctest.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest/doctest.main.-------.InstrumentCoverage.0.html
index 3566912628a..93a4004991f 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest/doctest.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest/doctest.main.-------.InstrumentCoverage.0.html
@@ -84,16 +84,16 @@ For revisions in Pull Requests (PR):
 75:9-75:26: @3[28]: _29 = (_24.0: &amp;&amp;i32)
 75:9-75:26: @3[30]: _30 = (_24.1: &amp;&amp;i32)
 75:9-75:26: @3[33]: _32 = &amp;(*_29)
-75:9-75:26: @3[35]: _33 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-75:9-75:26: @3.Call: _31 = ArgumentV1::new::&lt;&amp;i32&gt;(move _32, move _33) -&gt; [return: bb5, unwind: bb14]
+75:9-75:26: @3[35]: _33 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+75:9-75:26: @3.Call: _31 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _32, move _33) -&gt; [return: bb5, unwind: bb14]
 75:9-75:26: @5[4]: _35 = &amp;(*_30)
-75:9-75:26: @5[6]: _36 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-75:9-75:26: @5.Call: _34 = ArgumentV1::new::&lt;&amp;i32&gt;(move _35, move _36) -&gt; [return: bb6, unwind: bb14]
+75:9-75:26: @5[6]: _36 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+75:9-75:26: @5.Call: _34 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _35, move _36) -&gt; [return: bb6, unwind: bb14]
 75:9-75:26: @6[2]: _23 = [move _31, move _34]
 75:9-75:26: @6[7]: _22 = &amp;_23
 75:9-75:26: @6[8]: _21 = &amp;(*_22)
 75:9-75:26: @6[9]: _20 = move _21 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-75:9-75:26: @6.Call: _15 = Arguments::new_v1(move _16, move _20) -&gt; [return: bb7, unwind: bb14]
+75:9-75:26: @6.Call: _15 = std::fmt::Arguments::new_v1(move _16, move _20) -&gt; [return: bb7, unwind: bb14]
 75:9-75:26: @7.Call: core::panicking::panic_fmt(move _15) -&gt; bb14"><span class="annotation">@3,5,6,7⦊</span>assert_eq!(1, 1);<span class="annotation">⦉@3,5,6,7</span></span><span><span class="code odd" style="--layer: 1" title="75:9-75:26: @4[0]: _2 = const ()"><span class="annotation">⦉@4</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    } else {</span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code even" style="--layer: 1" title="77:9-77:26: @9[0]: _37 = const ()"><span class="annotation">@9⦊</span></span></span><span class="code even" style="--layer: 2" title="77:9-77:26: @8[5]: _72 = const main::promoted[0]
@@ -109,16 +109,16 @@ For revisions in Pull Requests (PR):
 77:9-77:26: @8[28]: _64 = (_59.0: &amp;&amp;i32)
 77:9-77:26: @8[30]: _65 = (_59.1: &amp;&amp;i32)
 77:9-77:26: @8[33]: _67 = &amp;(*_64)
-77:9-77:26: @8[35]: _68 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-77:9-77:26: @8.Call: _66 = ArgumentV1::new::&lt;&amp;i32&gt;(move _67, move _68) -&gt; [return: bb10, unwind: bb14]
+77:9-77:26: @8[35]: _68 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+77:9-77:26: @8.Call: _66 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _67, move _68) -&gt; [return: bb10, unwind: bb14]
 77:9-77:26: @10[4]: _70 = &amp;(*_65)
-77:9-77:26: @10[6]: _71 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-77:9-77:26: @10.Call: _69 = ArgumentV1::new::&lt;&amp;i32&gt;(move _70, move _71) -&gt; [return: bb11, unwind: bb14]
+77:9-77:26: @10[6]: _71 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+77:9-77:26: @10.Call: _69 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _70, move _71) -&gt; [return: bb11, unwind: bb14]
 77:9-77:26: @11[2]: _58 = [move _66, move _69]
 77:9-77:26: @11[7]: _57 = &amp;_58
 77:9-77:26: @11[8]: _56 = &amp;(*_57)
 77:9-77:26: @11[9]: _55 = move _56 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-77:9-77:26: @11.Call: _50 = Arguments::new_v1(move _51, move _55) -&gt; [return: bb12, unwind: bb14]
+77:9-77:26: @11.Call: _50 = std::fmt::Arguments::new_v1(move _51, move _55) -&gt; [return: bb12, unwind: bb14]
 77:9-77:26: @12.Call: core::panicking::panic_fmt(move _50) -&gt; bb14"><span class="annotation">@8,10,11,12⦊</span>assert_eq!(1, 2);<span class="annotation">⦉@8,10,11,12</span></span><span><span class="code even" style="--layer: 1" title="77:9-77:26: @9[0]: _37 = const ()"><span class="annotation">⦉@9</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span></span>
 <span class="line"><span class="code" style="--layer: 0">}</span><span><span class="code odd" style="--layer: 1" title="79:2-79:2: @13.Return: return"><span class="annotation">@13⦊</span>‸<span class="annotation">⦉@13</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest_crate/doctest_crate.fn_run_in_doctests.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest_crate/doctest_crate.fn_run_in_doctests.-------.InstrumentCoverage.0.html
index 02c25cc904c..f55bb0f32d9 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest_crate/doctest_crate.fn_run_in_doctests.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.doctest_crate/doctest_crate.fn_run_in_doctests.-------.InstrumentCoverage.0.html
@@ -84,16 +84,16 @@ For revisions in Pull Requests (PR):
 4:14-4:30: @6[28]: _28 = (_23.0: &amp;&amp;i32)
 4:14-4:30: @6[30]: _29 = (_23.1: &amp;&amp;i32)
 4:14-4:30: @6[33]: _31 = &amp;(*_28)
-4:14-4:30: @6[35]: _32 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-4:14-4:30: @6.Call: _30 = ArgumentV1::new::&lt;&amp;i32&gt;(move _31, move _32) -&gt; [return: bb8, unwind: bb29]
+4:14-4:30: @6[35]: _32 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+4:14-4:30: @6.Call: _30 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _31, move _32) -&gt; [return: bb8, unwind: bb29]
 4:14-4:30: @8[4]: _34 = &amp;(*_29)
-4:14-4:30: @8[6]: _35 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-4:14-4:30: @8.Call: _33 = ArgumentV1::new::&lt;&amp;i32&gt;(move _34, move _35) -&gt; [return: bb9, unwind: bb29]
+4:14-4:30: @8[6]: _35 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+4:14-4:30: @8.Call: _33 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _34, move _35) -&gt; [return: bb9, unwind: bb29]
 4:14-4:30: @9[2]: _22 = [move _30, move _33]
 4:14-4:30: @9[7]: _21 = &amp;_22
 4:14-4:30: @9[8]: _20 = &amp;(*_21)
 4:14-4:30: @9[9]: _19 = move _20 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-4:14-4:30: @9.Call: _14 = Arguments::new_v1(move _15, move _19) -&gt; [return: bb10, unwind: bb29]
+4:14-4:30: @9.Call: _14 = std::fmt::Arguments::new_v1(move _15, move _19) -&gt; [return: bb10, unwind: bb29]
 4:14-4:30: @10.Call: core::panicking::panic_fmt(move _14) -&gt; bb29"><span class="annotation">@6,8,9,10⦊</span>assert_eq!(1, 1)<span class="annotation">⦉@6,8,9,10</span></span><span><span class="code odd" style="--layer: 1" title="4:14-4:30: @7[0]: _0 = const ()"><span class="annotation">⦉@7</span></span></span><span class="code" style="--layer: 0">, // this is run,</span></span>
 <span class="line"><span class="code" style="--layer: 0">        2 =&gt; </span><span><span class="code even" style="--layer: 1" title="5:14-5:30: @13[0]: _0 = const ()"><span class="annotation">@13⦊</span></span></span><span class="code even" style="--layer: 2" title="5:14-5:30: @12[5]: _141 = const fn_run_in_doctests::promoted[3]
 5:14-5:30: @12[6]: _51 = &amp;(*_141)
@@ -108,16 +108,16 @@ For revisions in Pull Requests (PR):
 5:14-5:30: @12[28]: _62 = (_57.0: &amp;&amp;i32)
 5:14-5:30: @12[30]: _63 = (_57.1: &amp;&amp;i32)
 5:14-5:30: @12[33]: _65 = &amp;(*_62)
-5:14-5:30: @12[35]: _66 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-5:14-5:30: @12.Call: _64 = ArgumentV1::new::&lt;&amp;i32&gt;(move _65, move _66) -&gt; [return: bb14, unwind: bb29]
+5:14-5:30: @12[35]: _66 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+5:14-5:30: @12.Call: _64 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _65, move _66) -&gt; [return: bb14, unwind: bb29]
 5:14-5:30: @14[4]: _68 = &amp;(*_63)
-5:14-5:30: @14[6]: _69 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-5:14-5:30: @14.Call: _67 = ArgumentV1::new::&lt;&amp;i32&gt;(move _68, move _69) -&gt; [return: bb15, unwind: bb29]
+5:14-5:30: @14[6]: _69 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+5:14-5:30: @14.Call: _67 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _68, move _69) -&gt; [return: bb15, unwind: bb29]
 5:14-5:30: @15[2]: _56 = [move _64, move _67]
 5:14-5:30: @15[7]: _55 = &amp;_56
 5:14-5:30: @15[8]: _54 = &amp;(*_55)
 5:14-5:30: @15[9]: _53 = move _54 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-5:14-5:30: @15.Call: _48 = Arguments::new_v1(move _49, move _53) -&gt; [return: bb16, unwind: bb29]
+5:14-5:30: @15.Call: _48 = std::fmt::Arguments::new_v1(move _49, move _53) -&gt; [return: bb16, unwind: bb29]
 5:14-5:30: @16.Call: core::panicking::panic_fmt(move _48) -&gt; bb29"><span class="annotation">@12,14,15,16⦊</span>assert_eq!(1, 1)<span class="annotation">⦉@12,14,15,16</span></span><span><span class="code even" style="--layer: 1" title="5:14-5:30: @13[0]: _0 = const ()"><span class="annotation">⦉@13</span></span></span><span class="code" style="--layer: 0">, // this,</span></span>
 <span class="line"><span class="code" style="--layer: 0">        3 =&gt; </span><span><span class="code odd" style="--layer: 1" title="6:14-6:30: @19[0]: _0 = const ()"><span class="annotation">@19⦊</span></span></span><span class="code even" style="--layer: 2" title="6:14-6:30: @18[5]: _144 = const fn_run_in_doctests::promoted[6]
 6:14-6:30: @18[6]: _85 = &amp;(*_144)
@@ -132,16 +132,16 @@ For revisions in Pull Requests (PR):
 6:14-6:30: @18[28]: _96 = (_91.0: &amp;&amp;i32)
 6:14-6:30: @18[30]: _97 = (_91.1: &amp;&amp;i32)
 6:14-6:30: @18[33]: _99 = &amp;(*_96)
-6:14-6:30: @18[35]: _100 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-6:14-6:30: @18.Call: _98 = ArgumentV1::new::&lt;&amp;i32&gt;(move _99, move _100) -&gt; [return: bb20, unwind: bb29]
+6:14-6:30: @18[35]: _100 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+6:14-6:30: @18.Call: _98 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _99, move _100) -&gt; [return: bb20, unwind: bb29]
 6:14-6:30: @20[4]: _102 = &amp;(*_97)
-6:14-6:30: @20[6]: _103 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-6:14-6:30: @20.Call: _101 = ArgumentV1::new::&lt;&amp;i32&gt;(move _102, move _103) -&gt; [return: bb21, unwind: bb29]
+6:14-6:30: @20[6]: _103 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+6:14-6:30: @20.Call: _101 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _102, move _103) -&gt; [return: bb21, unwind: bb29]
 6:14-6:30: @21[2]: _90 = [move _98, move _101]
 6:14-6:30: @21[7]: _89 = &amp;_90
 6:14-6:30: @21[8]: _88 = &amp;(*_89)
 6:14-6:30: @21[9]: _87 = move _88 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-6:14-6:30: @21.Call: _82 = Arguments::new_v1(move _83, move _87) -&gt; [return: bb22, unwind: bb29]
+6:14-6:30: @21.Call: _82 = std::fmt::Arguments::new_v1(move _83, move _87) -&gt; [return: bb22, unwind: bb29]
 6:14-6:30: @22.Call: core::panicking::panic_fmt(move _82) -&gt; bb29"><span class="annotation">@18,20,21,22⦊</span>assert_eq!(1, 1)<span class="annotation">⦉@18,20,21,22</span></span><span><span class="code odd" style="--layer: 1" title="6:14-6:30: @19[0]: _0 = const ()"><span class="annotation">⦉@19</span></span></span><span class="code" style="--layer: 0">, // and this too</span></span>
 <span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code even" style="--layer: 1" title="7:14-7:30: @24[0]: _0 = const ()"><span class="annotation">@24⦊</span></span></span><span class="code even" style="--layer: 2" title="7:14-7:30: @23[5]: _147 = const fn_run_in_doctests::promoted[9]
 7:14-7:30: @23[6]: _119 = &amp;(*_147)
@@ -156,16 +156,16 @@ For revisions in Pull Requests (PR):
 7:14-7:30: @23[28]: _130 = (_125.0: &amp;&amp;i32)
 7:14-7:30: @23[30]: _131 = (_125.1: &amp;&amp;i32)
 7:14-7:30: @23[33]: _133 = &amp;(*_130)
-7:14-7:30: @23[35]: _134 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-7:14-7:30: @23.Call: _132 = ArgumentV1::new::&lt;&amp;i32&gt;(move _133, move _134) -&gt; [return: bb25, unwind: bb29]
+7:14-7:30: @23[35]: _134 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+7:14-7:30: @23.Call: _132 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _133, move _134) -&gt; [return: bb25, unwind: bb29]
 7:14-7:30: @25[4]: _136 = &amp;(*_131)
-7:14-7:30: @25[6]: _137 = &lt;&amp;i32 as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-7:14-7:30: @25.Call: _135 = ArgumentV1::new::&lt;&amp;i32&gt;(move _136, move _137) -&gt; [return: bb26, unwind: bb29]
+7:14-7:30: @25[6]: _137 = &lt;&amp;i32 as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r &amp;i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+7:14-7:30: @25.Call: _135 = std::fmt::ArgumentV1::new::&lt;&amp;i32&gt;(move _136, move _137) -&gt; [return: bb26, unwind: bb29]
 7:14-7:30: @26[2]: _124 = [move _132, move _135]
 7:14-7:30: @26[7]: _123 = &amp;_124
 7:14-7:30: @26[8]: _122 = &amp;(*_123)
 7:14-7:30: @26[9]: _121 = move _122 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-7:14-7:30: @26.Call: _116 = Arguments::new_v1(move _117, move _121) -&gt; [return: bb27, unwind: bb29]
+7:14-7:30: @26.Call: _116 = std::fmt::Arguments::new_v1(move _117, move _121) -&gt; [return: bb27, unwind: bb29]
 7:14-7:30: @27.Call: core::panicking::panic_fmt(move _116) -&gt; bb29"><span class="annotation">@23,25,26,27⦊</span>assert_eq!(1, 2)<span class="annotation">⦉@23,25,26,27</span></span><span><span class="code even" style="--layer: 1" title="7:14-7:30: @24[0]: _0 = const ()"><span class="annotation">⦉@24</span></span></span><span class="code" style="--layer: 0">, // however this is not</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span></span>
 <span class="line"><span class="code" style="--layer: 0">}</span><span><span class="code odd" style="--layer: 1" title="9:2-9:2: @28.Return: return"><span class="annotation">@28⦊</span>‸<span class="annotation">⦉@28</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.main.-------.InstrumentCoverage.0.html
index 3b5d1e2cdac..66a6e776a06 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.main.-------.InstrumentCoverage.0.html
@@ -109,8 +109,8 @@ For revisions in Pull Requests (PR):
 20:9-20:43: @1[18]: _15 = &amp;(*_20)
 20:9-20:43: @1[19]: _14 = &amp;(*_15)
 20:9-20:43: @1[20]: _13 = move _14 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-20:9-20:43: @1.Call: _8 = Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb11]
-20:9-20:43: @3.Call: _7 = _print(move _8) -&gt; [return: bb4, unwind: bb11]
+20:9-20:43: @1.Call: _8 = std::fmt::Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb11]
+20:9-20:43: @3.Call: _7 = std::io::_print(move _8) -&gt; [return: bb4, unwind: bb11]
 20:9-20:43: @4[5]: _6 = const ()
 21:16-21:22: @4[7]: _0 = std::result::Result::&lt;(), u8&gt;::Err(const 1_u8)"><span class="annotation">@1,3,4,8,9⦊</span>println!("Exiting with error...");</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="20:18-20:41: @1[6]: _21 = const main::promoted[1]
@@ -123,8 +123,8 @@ For revisions in Pull Requests (PR):
 20:9-20:43: @1[18]: _15 = &amp;(*_20)
 20:9-20:43: @1[19]: _14 = &amp;(*_15)
 20:9-20:43: @1[20]: _13 = move _14 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-20:9-20:43: @1.Call: _8 = Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb11]
-20:9-20:43: @3.Call: _7 = _print(move _8) -&gt; [return: bb4, unwind: bb11]
+20:9-20:43: @1.Call: _8 = std::fmt::Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb11]
+20:9-20:43: @3.Call: _7 = std::io::_print(move _8) -&gt; [return: bb4, unwind: bb11]
 20:9-20:43: @4[5]: _6 = const ()
 21:16-21:22: @4[7]: _0 = std::result::Result::&lt;(), u8&gt;::Err(const 1_u8)">        return Err(1)<span class="annotation">⦉@1,3,4,8,9</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="22:6-22:6: @2[0]: _3 = const ()
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.{impl#0}-drop.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.{impl#0}-drop.-------.InstrumentCoverage.0.html
index b5dedeec8ac..57d56c5cf73 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.{impl#0}-drop.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.drop_trait/drop_trait.{impl#0}-drop.-------.InstrumentCoverage.0.html
@@ -69,7 +69,7 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 8"><span class="line">    <span><span class="code even" style="--layer: 1" title="10:18-10:36: @0[6]: _19 = const &lt;Firework as Drop&gt;::drop::promoted[0]
+<div class="code" style="counter-reset: line 8"><span class="line">    <span><span class="code even" style="--layer: 1" title="10:18-10:36: @0[6]: _19 = const &lt;Firework as std::ops::Drop&gt;::drop::promoted[0]
 10:18-10:36: @0[7]: _7 = &amp;(*_19)
 10:18-10:36: @0[8]: _6 = &amp;(*_7)
 10:18-10:36: @0[9]: _5 = move _6 as &amp;[&amp;str] (Pointer(Unsize))
@@ -79,17 +79,17 @@ For revisions in Pull Requests (PR):
 10:9-10:53: @0[22]: _15 = (_13.0: &amp;i32)
 10:9-10:53: @0[25]: _17 = &amp;(*_15)
 10:9-10:53: @0[27]: _18 = &lt;i32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-10:9-10:53: @0.Call: _16 = ArgumentV1::new::&lt;i32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+10:9-10:53: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;i32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 10:9-10:53: @1[2]: _12 = [move _16]
 10:9-10:53: @1[5]: _11 = &amp;_12
 10:9-10:53: @1[6]: _10 = &amp;(*_11)
 10:9-10:53: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-10:9-10:53: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-10:9-10:53: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+10:9-10:53: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+10:9-10:53: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 10:9-10:53: @3[6]: _2 = const ()
 9:24-11:6: @3[8]: _0 = const ()
 11:6-11:6: @3.Return: return"><span class="annotation">@0,1,2,3⦊</span>fn drop(&amp;mut self) {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:18-10:36: @0[6]: _19 = const &lt;Firework as Drop&gt;::drop::promoted[0]
+<span class="line"><span class="code even" style="--layer: 1" title="10:18-10:36: @0[6]: _19 = const &lt;Firework as std::ops::Drop&gt;::drop::promoted[0]
 10:18-10:36: @0[7]: _7 = &amp;(*_19)
 10:18-10:36: @0[8]: _6 = &amp;(*_7)
 10:18-10:36: @0[9]: _5 = move _6 as &amp;[&amp;str] (Pointer(Unsize))
@@ -99,17 +99,17 @@ For revisions in Pull Requests (PR):
 10:9-10:53: @0[22]: _15 = (_13.0: &amp;i32)
 10:9-10:53: @0[25]: _17 = &amp;(*_15)
 10:9-10:53: @0[27]: _18 = &lt;i32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-10:9-10:53: @0.Call: _16 = ArgumentV1::new::&lt;i32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+10:9-10:53: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;i32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 10:9-10:53: @1[2]: _12 = [move _16]
 10:9-10:53: @1[5]: _11 = &amp;_12
 10:9-10:53: @1[6]: _10 = &amp;(*_11)
 10:9-10:53: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-10:9-10:53: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-10:9-10:53: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+10:9-10:53: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+10:9-10:53: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 10:9-10:53: @3[6]: _2 = const ()
 9:24-11:6: @3[8]: _0 = const ()
 11:6-11:6: @3.Return: return">        println!("BOOM times {}!!!", self.strength);</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:18-10:36: @0[6]: _19 = const &lt;Firework as Drop&gt;::drop::promoted[0]
+<span class="line"><span class="code even" style="--layer: 1" title="10:18-10:36: @0[6]: _19 = const &lt;Firework as std::ops::Drop&gt;::drop::promoted[0]
 10:18-10:36: @0[7]: _7 = &amp;(*_19)
 10:18-10:36: @0[8]: _6 = &amp;(*_7)
 10:18-10:36: @0[9]: _5 = move _6 as &amp;[&amp;str] (Pointer(Unsize))
@@ -119,13 +119,13 @@ For revisions in Pull Requests (PR):
 10:9-10:53: @0[22]: _15 = (_13.0: &amp;i32)
 10:9-10:53: @0[25]: _17 = &amp;(*_15)
 10:9-10:53: @0[27]: _18 = &lt;i32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r i32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-10:9-10:53: @0.Call: _16 = ArgumentV1::new::&lt;i32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+10:9-10:53: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;i32&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 10:9-10:53: @1[2]: _12 = [move _16]
 10:9-10:53: @1[5]: _11 = &amp;_12
 10:9-10:53: @1[6]: _10 = &amp;(*_11)
 10:9-10:53: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-10:9-10:53: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-10:9-10:53: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+10:9-10:53: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+10:9-10:53: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 10:9-10:53: @3[6]: _2 = const ()
 9:24-11:6: @3[8]: _0 = const ()
 11:6-11:6: @3.Return: return">    }<span class="annotation">⦉@0,1,2,3</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.main.-------.InstrumentCoverage.0.html
index 0373b38e1b1..098c1404251 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.main.-------.InstrumentCoverage.0.html
@@ -178,8 +178,8 @@ For revisions in Pull Requests (PR):
 31:9-31:43: @4[18]: _21 = &amp;(*_26)
 31:9-31:43: @4[19]: _20 = &amp;(*_21)
 31:9-31:43: @4[20]: _19 = move _20 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-31:9-31:43: @4.Call: _14 = Arguments::new_v1(move _15, move _19) -&gt; [return: bb6, unwind: bb14]
-31:9-31:43: @6.Call: _13 = _print(move _14) -&gt; [return: bb7, unwind: bb14]
+31:9-31:43: @4.Call: _14 = std::fmt::Arguments::new_v1(move _15, move _19) -&gt; [return: bb6, unwind: bb14]
+31:9-31:43: @6.Call: _13 = std::io::_print(move _14) -&gt; [return: bb7, unwind: bb14]
 31:9-31:43: @7[5]: _12 = const ()
 32:16-32:22: @7[7]: _0 = std::result::Result::&lt;(), u8&gt;::Err(const 1_u8)"><span class="annotation">@4,6,7,11,12⦊</span>println!("Exiting with error...");</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="31:18-31:41: @4[6]: _27 = const main::promoted[1]
@@ -192,8 +192,8 @@ For revisions in Pull Requests (PR):
 31:9-31:43: @4[18]: _21 = &amp;(*_26)
 31:9-31:43: @4[19]: _20 = &amp;(*_21)
 31:9-31:43: @4[20]: _19 = move _20 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-31:9-31:43: @4.Call: _14 = Arguments::new_v1(move _15, move _19) -&gt; [return: bb6, unwind: bb14]
-31:9-31:43: @6.Call: _13 = _print(move _14) -&gt; [return: bb7, unwind: bb14]
+31:9-31:43: @4.Call: _14 = std::fmt::Arguments::new_v1(move _15, move _19) -&gt; [return: bb6, unwind: bb14]
+31:9-31:43: @6.Call: _13 = std::io::_print(move _14) -&gt; [return: bb7, unwind: bb14]
 31:9-31:43: @7[5]: _12 = const ()
 32:16-32:22: @7[7]: _0 = std::result::Result::&lt;(), u8&gt;::Err(const 1_u8)">        return Err(1)<span class="annotation">⦉@4,6,7,11,12</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span><span><span class="code even" style="--layer: 1" title="33:6-33:6: @5[0]: _9 = const ()
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.{impl#1}-drop.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.{impl#1}-drop.-------.InstrumentCoverage.0.html
index c4e99bd679d..4908bc7b4a7 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.{impl#1}-drop.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.generics/generics.{impl#1}-drop.-------.InstrumentCoverage.0.html
@@ -69,7 +69,7 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 16"><span class="line">    <span><span class="code even" style="--layer: 1" title="18:18-18:36: @0[6]: _19 = const &lt;Firework&lt;T&gt; as Drop&gt;::drop::promoted[0]
+<div class="code" style="counter-reset: line 16"><span class="line">    <span><span class="code even" style="--layer: 1" title="18:18-18:36: @0[6]: _19 = const &lt;Firework&lt;T&gt; as std::ops::Drop&gt;::drop::promoted[0]
 18:18-18:36: @0[7]: _7 = &amp;(*_19)
 18:18-18:36: @0[8]: _6 = &amp;(*_7)
 18:18-18:36: @0[9]: _5 = move _6 as &amp;[&amp;str] (Pointer(Unsize))
@@ -79,17 +79,17 @@ For revisions in Pull Requests (PR):
 18:9-18:53: @0[22]: _15 = (_13.0: &amp;T)
 18:9-18:53: @0[25]: _17 = &amp;(*_15)
 18:9-18:53: @0[27]: _18 = &lt;T as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-18:9-18:53: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+18:9-18:53: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 18:9-18:53: @1[2]: _12 = [move _16]
 18:9-18:53: @1[5]: _11 = &amp;_12
 18:9-18:53: @1[6]: _10 = &amp;(*_11)
 18:9-18:53: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-18:9-18:53: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-18:9-18:53: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+18:9-18:53: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+18:9-18:53: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 18:9-18:53: @3[6]: _2 = const ()
 17:24-19:6: @3[8]: _0 = const ()
 19:6-19:6: @3.Return: return"><span class="annotation">@0,1,2,3⦊</span>fn drop(&amp;mut self) {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="18:18-18:36: @0[6]: _19 = const &lt;Firework&lt;T&gt; as Drop&gt;::drop::promoted[0]
+<span class="line"><span class="code even" style="--layer: 1" title="18:18-18:36: @0[6]: _19 = const &lt;Firework&lt;T&gt; as std::ops::Drop&gt;::drop::promoted[0]
 18:18-18:36: @0[7]: _7 = &amp;(*_19)
 18:18-18:36: @0[8]: _6 = &amp;(*_7)
 18:18-18:36: @0[9]: _5 = move _6 as &amp;[&amp;str] (Pointer(Unsize))
@@ -99,17 +99,17 @@ For revisions in Pull Requests (PR):
 18:9-18:53: @0[22]: _15 = (_13.0: &amp;T)
 18:9-18:53: @0[25]: _17 = &amp;(*_15)
 18:9-18:53: @0[27]: _18 = &lt;T as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-18:9-18:53: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+18:9-18:53: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 18:9-18:53: @1[2]: _12 = [move _16]
 18:9-18:53: @1[5]: _11 = &amp;_12
 18:9-18:53: @1[6]: _10 = &amp;(*_11)
 18:9-18:53: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-18:9-18:53: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-18:9-18:53: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+18:9-18:53: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+18:9-18:53: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 18:9-18:53: @3[6]: _2 = const ()
 17:24-19:6: @3[8]: _0 = const ()
 19:6-19:6: @3.Return: return">        println!("BOOM times {}!!!", self.strength);</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="18:18-18:36: @0[6]: _19 = const &lt;Firework&lt;T&gt; as Drop&gt;::drop::promoted[0]
+<span class="line"><span class="code even" style="--layer: 1" title="18:18-18:36: @0[6]: _19 = const &lt;Firework&lt;T&gt; as std::ops::Drop&gt;::drop::promoted[0]
 18:18-18:36: @0[7]: _7 = &amp;(*_19)
 18:18-18:36: @0[8]: _6 = &amp;(*_7)
 18:18-18:36: @0[9]: _5 = move _6 as &amp;[&amp;str] (Pointer(Unsize))
@@ -119,13 +119,13 @@ For revisions in Pull Requests (PR):
 18:9-18:53: @0[22]: _15 = (_13.0: &amp;T)
 18:9-18:53: @0[25]: _17 = &amp;(*_15)
 18:9-18:53: @0[27]: _18 = &lt;T as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-18:9-18:53: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+18:9-18:53: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 18:9-18:53: @1[2]: _12 = [move _16]
 18:9-18:53: @1[5]: _11 = &amp;_12
 18:9-18:53: @1[6]: _10 = &amp;(*_11)
 18:9-18:53: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-18:9-18:53: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-18:9-18:53: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+18:9-18:53: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+18:9-18:53: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 18:9-18:53: @3[6]: _2 = const ()
 17:24-19:6: @3[8]: _0 = const ()
 19:6-19:6: @3.Return: return">    }<span class="annotation">⦉@0,1,2,3</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if/if.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if/if.main.-------.InstrumentCoverage.0.html
index dd9ba4a190c..d6eccf57846 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if/if.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if/if.main.-------.InstrumentCoverage.0.html
@@ -69,153 +69,153 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    let</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    is_true</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    =</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">        std::env::args().len()</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    ==</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">        1</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    ;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    let</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">        mut</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    countdown</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    =</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">        0</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    ;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
 15:9-16:14: @3[3]: FakeRead(ForLet, _5)
 21:9-21:16: @3[5]: _6 = _1">    if</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="10:9-10:25: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 10:9-10:25: @1[0]: _3 = &amp;_4
-10:9-10:31: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+10:9-10:31: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 10:9-12:10: @2[1]: _1 = Eq(move _2, const 1_usize)
 8:5-8:12: @2[3]: FakeRead(ForLet, _1)
 18:9-18:10: @3[2]: _5 = const 0_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if_else/if_else.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if_else/if_else.main.-------.InstrumentCoverage.0.html
index b642be382cb..e0f0ac40205 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if_else/if_else.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.if_else/if_else.main.-------.InstrumentCoverage.0.html
@@ -69,73 +69,73 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1">    let mut countdown = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 11:9-11:16: @3[6]: _7 = _1">    if</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb11]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb11]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb10]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-InTrait-default_trait_func.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-InTrait-default_trait_func.-------.InstrumentCoverage.0.html
index 29548fa1124..1dc5bb64e0b 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-InTrait-default_trait_func.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-InTrait-default_trait_func.-------.InstrumentCoverage.0.html
@@ -69,24 +69,24 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 32"><span class="line">        <span><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = in_func(const IN_CONST) -&gt; [return: bb1, unwind: bb3]
+<div class="code" style="counter-reset: line 32"><span class="line">        <span><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = main::in_func(const main::IN_CONST) -&gt; [return: bb1, unwind: bb3]
 35:13-35:17: @1[3]: _4 = &amp;mut (*_1)
-35:13-35:38: @1.Call: _3 = &lt;Self as InTrait&gt;::trait_func(move _4, const IN_CONST) -&gt; [return: bb2, unwind: bb3]
+35:13-35:38: @1.Call: _3 = &lt;Self as main::InTrait&gt;::trait_func(move _4, const main::IN_CONST) -&gt; [return: bb2, unwind: bb3]
 33:42-36:10: @2[2]: _0 = const ()
 36:10-36:10: @2.Return: return"><span class="annotation">@0,1,2⦊</span>fn default_trait_func(&amp;mut self) {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = in_func(const IN_CONST) -&gt; [return: bb1, unwind: bb3]
+<span class="line"><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = main::in_func(const main::IN_CONST) -&gt; [return: bb1, unwind: bb3]
 35:13-35:17: @1[3]: _4 = &amp;mut (*_1)
-35:13-35:38: @1.Call: _3 = &lt;Self as InTrait&gt;::trait_func(move _4, const IN_CONST) -&gt; [return: bb2, unwind: bb3]
+35:13-35:38: @1.Call: _3 = &lt;Self as main::InTrait&gt;::trait_func(move _4, const main::IN_CONST) -&gt; [return: bb2, unwind: bb3]
 33:42-36:10: @2[2]: _0 = const ()
 36:10-36:10: @2.Return: return">            in_func(IN_CONST);</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = in_func(const IN_CONST) -&gt; [return: bb1, unwind: bb3]
+<span class="line"><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = main::in_func(const main::IN_CONST) -&gt; [return: bb1, unwind: bb3]
 35:13-35:17: @1[3]: _4 = &amp;mut (*_1)
-35:13-35:38: @1.Call: _3 = &lt;Self as InTrait&gt;::trait_func(move _4, const IN_CONST) -&gt; [return: bb2, unwind: bb3]
+35:13-35:38: @1.Call: _3 = &lt;Self as main::InTrait&gt;::trait_func(move _4, const main::IN_CONST) -&gt; [return: bb2, unwind: bb3]
 33:42-36:10: @2[2]: _0 = const ()
 36:10-36:10: @2.Return: return">            self.trait_func(IN_CONST);</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = in_func(const IN_CONST) -&gt; [return: bb1, unwind: bb3]
+<span class="line"><span class="code even" style="--layer: 1" title="34:13-34:30: @0.Call: _2 = main::in_func(const main::IN_CONST) -&gt; [return: bb1, unwind: bb3]
 35:13-35:17: @1[3]: _4 = &amp;mut (*_1)
-35:13-35:38: @1.Call: _3 = &lt;Self as InTrait&gt;::trait_func(move _4, const IN_CONST) -&gt; [return: bb2, unwind: bb3]
+35:13-35:38: @1.Call: _3 = &lt;Self as main::InTrait&gt;::trait_func(move _4, const main::IN_CONST) -&gt; [return: bb2, unwind: bb3]
 33:42-36:10: @2[2]: _0 = const ()
 36:10-36:10: @2.Return: return">        }<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-in_func.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-in_func.-------.InstrumentCoverage.0.html
index 8b5257b02bb..82724e5e865 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-in_func.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-in_func.-------.InstrumentCoverage.0.html
@@ -76,7 +76,7 @@ For revisions in Pull Requests (PR):
 20:17-20:22: @0[8]: _6 = CheckedAdd(_4, _5)
 20:17-20:22: @1[0]: _3 = move (_6.0: u32)
 20:13-20:14: @1[3]: FakeRead(ForLet, _3)
-21:18-21:26: @1[9]: _23 = const in_func::promoted[0]
+21:18-21:26: @1[9]: _23 = const main::in_func::promoted[0]
 21:18-21:26: @1[10]: _11 = &amp;(*_23)
 21:18-21:26: @1[11]: _10 = &amp;(*_11)
 21:18-21:26: @1[12]: _9 = move _10 as &amp;[&amp;str] (Pointer(Unsize))
@@ -86,13 +86,13 @@ For revisions in Pull Requests (PR):
 21:9-21:30: @1[25]: _19 = (_17.0: &amp;u32)
 21:9-21:30: @1[28]: _21 = &amp;(*_19)
 21:9-21:30: @1[30]: _22 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-21:9-21:30: @1.Call: _20 = ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
+21:9-21:30: @1.Call: _20 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
 21:9-21:30: @2[2]: _16 = [move _20]
 21:9-21:30: @2[5]: _15 = &amp;_16
 21:9-21:30: @2[6]: _14 = &amp;(*_15)
 21:9-21:30: @2[7]: _13 = move _14 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-21:9-21:30: @2.Call: _8 = Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
-21:9-21:30: @3.Call: _7 = _print(move _8) -&gt; [return: bb4, unwind: bb5]
+21:9-21:30: @2.Call: _8 = std::fmt::Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
+21:9-21:30: @3.Call: _7 = std::io::_print(move _8) -&gt; [return: bb4, unwind: bb5]
 21:9-21:30: @4[6]: _0 = const ()
 22:6-22:6: @4.Return: return"><span class="annotation">@0,1,2,3,4⦊</span>fn in_func(a: u32) {</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="19:17-19:18: @0[1]: _2 = const 1_u32
@@ -102,7 +102,7 @@ For revisions in Pull Requests (PR):
 20:17-20:22: @0[8]: _6 = CheckedAdd(_4, _5)
 20:17-20:22: @1[0]: _3 = move (_6.0: u32)
 20:13-20:14: @1[3]: FakeRead(ForLet, _3)
-21:18-21:26: @1[9]: _23 = const in_func::promoted[0]
+21:18-21:26: @1[9]: _23 = const main::in_func::promoted[0]
 21:18-21:26: @1[10]: _11 = &amp;(*_23)
 21:18-21:26: @1[11]: _10 = &amp;(*_11)
 21:18-21:26: @1[12]: _9 = move _10 as &amp;[&amp;str] (Pointer(Unsize))
@@ -112,13 +112,13 @@ For revisions in Pull Requests (PR):
 21:9-21:30: @1[25]: _19 = (_17.0: &amp;u32)
 21:9-21:30: @1[28]: _21 = &amp;(*_19)
 21:9-21:30: @1[30]: _22 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-21:9-21:30: @1.Call: _20 = ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
+21:9-21:30: @1.Call: _20 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
 21:9-21:30: @2[2]: _16 = [move _20]
 21:9-21:30: @2[5]: _15 = &amp;_16
 21:9-21:30: @2[6]: _14 = &amp;(*_15)
 21:9-21:30: @2[7]: _13 = move _14 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-21:9-21:30: @2.Call: _8 = Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
-21:9-21:30: @3.Call: _7 = _print(move _8) -&gt; [return: bb4, unwind: bb5]
+21:9-21:30: @2.Call: _8 = std::fmt::Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
+21:9-21:30: @3.Call: _7 = std::io::_print(move _8) -&gt; [return: bb4, unwind: bb5]
 21:9-21:30: @4[6]: _0 = const ()
 22:6-22:6: @4.Return: return">        let b = 1;</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="19:17-19:18: @0[1]: _2 = const 1_u32
@@ -128,7 +128,7 @@ For revisions in Pull Requests (PR):
 20:17-20:22: @0[8]: _6 = CheckedAdd(_4, _5)
 20:17-20:22: @1[0]: _3 = move (_6.0: u32)
 20:13-20:14: @1[3]: FakeRead(ForLet, _3)
-21:18-21:26: @1[9]: _23 = const in_func::promoted[0]
+21:18-21:26: @1[9]: _23 = const main::in_func::promoted[0]
 21:18-21:26: @1[10]: _11 = &amp;(*_23)
 21:18-21:26: @1[11]: _10 = &amp;(*_11)
 21:18-21:26: @1[12]: _9 = move _10 as &amp;[&amp;str] (Pointer(Unsize))
@@ -138,13 +138,13 @@ For revisions in Pull Requests (PR):
 21:9-21:30: @1[25]: _19 = (_17.0: &amp;u32)
 21:9-21:30: @1[28]: _21 = &amp;(*_19)
 21:9-21:30: @1[30]: _22 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-21:9-21:30: @1.Call: _20 = ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
+21:9-21:30: @1.Call: _20 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
 21:9-21:30: @2[2]: _16 = [move _20]
 21:9-21:30: @2[5]: _15 = &amp;_16
 21:9-21:30: @2[6]: _14 = &amp;(*_15)
 21:9-21:30: @2[7]: _13 = move _14 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-21:9-21:30: @2.Call: _8 = Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
-21:9-21:30: @3.Call: _7 = _print(move _8) -&gt; [return: bb4, unwind: bb5]
+21:9-21:30: @2.Call: _8 = std::fmt::Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
+21:9-21:30: @3.Call: _7 = std::io::_print(move _8) -&gt; [return: bb4, unwind: bb5]
 21:9-21:30: @4[6]: _0 = const ()
 22:6-22:6: @4.Return: return">        let c = a + b;</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="19:17-19:18: @0[1]: _2 = const 1_u32
@@ -154,7 +154,7 @@ For revisions in Pull Requests (PR):
 20:17-20:22: @0[8]: _6 = CheckedAdd(_4, _5)
 20:17-20:22: @1[0]: _3 = move (_6.0: u32)
 20:13-20:14: @1[3]: FakeRead(ForLet, _3)
-21:18-21:26: @1[9]: _23 = const in_func::promoted[0]
+21:18-21:26: @1[9]: _23 = const main::in_func::promoted[0]
 21:18-21:26: @1[10]: _11 = &amp;(*_23)
 21:18-21:26: @1[11]: _10 = &amp;(*_11)
 21:18-21:26: @1[12]: _9 = move _10 as &amp;[&amp;str] (Pointer(Unsize))
@@ -164,13 +164,13 @@ For revisions in Pull Requests (PR):
 21:9-21:30: @1[25]: _19 = (_17.0: &amp;u32)
 21:9-21:30: @1[28]: _21 = &amp;(*_19)
 21:9-21:30: @1[30]: _22 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-21:9-21:30: @1.Call: _20 = ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
+21:9-21:30: @1.Call: _20 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
 21:9-21:30: @2[2]: _16 = [move _20]
 21:9-21:30: @2[5]: _15 = &amp;_16
 21:9-21:30: @2[6]: _14 = &amp;(*_15)
 21:9-21:30: @2[7]: _13 = move _14 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-21:9-21:30: @2.Call: _8 = Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
-21:9-21:30: @3.Call: _7 = _print(move _8) -&gt; [return: bb4, unwind: bb5]
+21:9-21:30: @2.Call: _8 = std::fmt::Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
+21:9-21:30: @3.Call: _7 = std::io::_print(move _8) -&gt; [return: bb4, unwind: bb5]
 21:9-21:30: @4[6]: _0 = const ()
 22:6-22:6: @4.Return: return">        println!("c = {}", c)</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="19:17-19:18: @0[1]: _2 = const 1_u32
@@ -180,7 +180,7 @@ For revisions in Pull Requests (PR):
 20:17-20:22: @0[8]: _6 = CheckedAdd(_4, _5)
 20:17-20:22: @1[0]: _3 = move (_6.0: u32)
 20:13-20:14: @1[3]: FakeRead(ForLet, _3)
-21:18-21:26: @1[9]: _23 = const in_func::promoted[0]
+21:18-21:26: @1[9]: _23 = const main::in_func::promoted[0]
 21:18-21:26: @1[10]: _11 = &amp;(*_23)
 21:18-21:26: @1[11]: _10 = &amp;(*_11)
 21:18-21:26: @1[12]: _9 = move _10 as &amp;[&amp;str] (Pointer(Unsize))
@@ -190,13 +190,13 @@ For revisions in Pull Requests (PR):
 21:9-21:30: @1[25]: _19 = (_17.0: &amp;u32)
 21:9-21:30: @1[28]: _21 = &amp;(*_19)
 21:9-21:30: @1[30]: _22 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-21:9-21:30: @1.Call: _20 = ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
+21:9-21:30: @1.Call: _20 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _21, move _22) -&gt; [return: bb2, unwind: bb5]
 21:9-21:30: @2[2]: _16 = [move _20]
 21:9-21:30: @2[5]: _15 = &amp;_16
 21:9-21:30: @2[6]: _14 = &amp;(*_15)
 21:9-21:30: @2[7]: _13 = move _14 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-21:9-21:30: @2.Call: _8 = Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
-21:9-21:30: @3.Call: _7 = _print(move _8) -&gt; [return: bb4, unwind: bb5]
+21:9-21:30: @2.Call: _8 = std::fmt::Arguments::new_v1(move _9, move _13) -&gt; [return: bb3, unwind: bb5]
+21:9-21:30: @3.Call: _7 = std::io::_print(move _8) -&gt; [return: bb4, unwind: bb5]
 21:9-21:30: @4[6]: _0 = const ()
 22:6-22:6: @4.Return: return">    }<span class="annotation">⦉@0,1,2,3,4</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-{impl#0}-trait_func.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-{impl#0}-trait_func.-------.InstrumentCoverage.0.html
index ee1e0339049..b00a781a0a7 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-{impl#0}-trait_func.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main-{impl#0}-trait_func.-------.InstrumentCoverage.0.html
@@ -73,28 +73,28 @@ For revisions in Pull Requests (PR):
 41:13-41:41: @0[2]: _4 = CheckedAdd(((*_1).0: u32), _3)
 41:13-41:41: @1[0]: ((*_1).0: u32) = move (_4.0: u32)
 42:21-42:41: @1[4]: _6 = ((*_1).0: u32)
-42:13-42:42: @1.Call: _5 = in_func(move _6) -&gt; [return: bb2, unwind: bb3]
+42:13-42:42: @1.Call: _5 = main::in_func(move _6) -&gt; [return: bb2, unwind: bb3]
 40:45-43:10: @2[2]: _0 = const ()
 43:10-43:10: @2.Return: return"><span class="annotation">@0,1,2⦊</span>fn trait_func(&amp;mut self, incr: u32) {</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="41:37-41:41: @0[1]: _3 = _2
 41:13-41:41: @0[2]: _4 = CheckedAdd(((*_1).0: u32), _3)
 41:13-41:41: @1[0]: ((*_1).0: u32) = move (_4.0: u32)
 42:21-42:41: @1[4]: _6 = ((*_1).0: u32)
-42:13-42:42: @1.Call: _5 = in_func(move _6) -&gt; [return: bb2, unwind: bb3]
+42:13-42:42: @1.Call: _5 = main::in_func(move _6) -&gt; [return: bb2, unwind: bb3]
 40:45-43:10: @2[2]: _0 = const ()
 43:10-43:10: @2.Return: return">            self.in_struct_field += incr;</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="41:37-41:41: @0[1]: _3 = _2
 41:13-41:41: @0[2]: _4 = CheckedAdd(((*_1).0: u32), _3)
 41:13-41:41: @1[0]: ((*_1).0: u32) = move (_4.0: u32)
 42:21-42:41: @1[4]: _6 = ((*_1).0: u32)
-42:13-42:42: @1.Call: _5 = in_func(move _6) -&gt; [return: bb2, unwind: bb3]
+42:13-42:42: @1.Call: _5 = main::in_func(move _6) -&gt; [return: bb2, unwind: bb3]
 40:45-43:10: @2[2]: _0 = const ()
 43:10-43:10: @2.Return: return">            in_func(self.in_struct_field);</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="41:37-41:41: @0[1]: _3 = _2
 41:13-41:41: @0[2]: _4 = CheckedAdd(((*_1).0: u32), _3)
 41:13-41:41: @1[0]: ((*_1).0: u32) = move (_4.0: u32)
 42:21-42:41: @1[4]: _6 = ((*_1).0: u32)
-42:13-42:42: @1.Call: _5 = in_func(move _6) -&gt; [return: bb2, unwind: bb3]
+42:13-42:42: @1.Call: _5 = main::in_func(move _6) -&gt; [return: bb2, unwind: bb3]
 40:45-43:10: @2[2]: _0 = const ()
 43:10-43:10: @2.Return: return">        }<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main.-------.InstrumentCoverage.0.html
index d21710b7240..4a1003dfbed 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.inner_items/inner_items.main.-------.InstrumentCoverage.0.html
@@ -73,33 +73,33 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
 <span class="line"><span class="code" style="--layer: 0">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
 <span class="line"><span class="code" style="--layer: 0">    // dependent conditions.</span></span>
-<span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_u32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1"><span class="annotation">@0,1,2,3⦊</span>is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_u32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_u32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1">    let mut countdown = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_u32
@@ -146,44 +146,44 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">    type InType = String;</span></span>
 <span class="line"><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    if </span><span><span class="code odd" style="--layer: 1" title="48:8-48:15: @6[4]: _9 = _1"><span class="annotation">@6⦊</span>is_true<span class="annotation">⦉@6</span></span></span><span class="code" style="--layer: 0"> </span><span><span class="code even" style="--layer: 1" title="49:17-49:26: @7[2]: _11 = _5
-49:9-49:27: @7.Call: _10 = in_func(move _11) -&gt; [return: bb9, unwind: bb13]
+49:9-49:27: @7.Call: _10 = main::in_func(move _11) -&gt; [return: bb9, unwind: bb13]
 48:16-50:6: @9[2]: _8 = const ()"><span class="annotation">@7,9⦊</span>{</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="49:17-49:26: @7[2]: _11 = _5
-49:9-49:27: @7.Call: _10 = in_func(move _11) -&gt; [return: bb9, unwind: bb13]
+49:9-49:27: @7.Call: _10 = main::in_func(move _11) -&gt; [return: bb9, unwind: bb13]
 48:16-50:6: @9[2]: _8 = const ()">        in_func(countdown);</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="49:17-49:26: @7[2]: _11 = _5
-49:9-49:27: @7.Call: _10 = in_func(move _11) -&gt; [return: bb9, unwind: bb13]
+49:9-49:27: @7.Call: _10 = main::in_func(move _11) -&gt; [return: bb9, unwind: bb13]
 48:16-50:6: @9[2]: _8 = const ()">    }<span class="annotation">⦉@7,9</span></span></span><span><span class="code odd" style="--layer: 1" title="50:6-50:6: @8[0]: _8 = const ()"><span class="annotation">@8⦊</span>‸<span class="annotation">⦉@8</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0"></span></span>
-<span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = InStruct { in_struct_field: const 101_u32 }
+<span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = main::InStruct { in_struct_field: const 101_u32 }
 52:9-52:16: @10[4]: FakeRead(ForLet, _12)
 56:5-56:8: @10[7]: _14 = &amp;mut _12
-56:5-56:29: @10.Call: _13 = &lt;InStruct as InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
+56:5-56:29: @10.Call: _13 = &lt;main::InStruct as main::InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
 57:2-57:2: @11.Return: return"><span class="annotation">@10,11⦊</span>mut val = InStruct {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = InStruct { in_struct_field: const 101_u32 }
+<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = main::InStruct { in_struct_field: const 101_u32 }
 52:9-52:16: @10[4]: FakeRead(ForLet, _12)
 56:5-56:8: @10[7]: _14 = &amp;mut _12
-56:5-56:29: @10.Call: _13 = &lt;InStruct as InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
+56:5-56:29: @10.Call: _13 = &lt;main::InStruct as main::InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
 57:2-57:2: @11.Return: return">        in_struct_field: 101,</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = InStruct { in_struct_field: const 101_u32 }
+<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = main::InStruct { in_struct_field: const 101_u32 }
 52:9-52:16: @10[4]: FakeRead(ForLet, _12)
 56:5-56:8: @10[7]: _14 = &amp;mut _12
-56:5-56:29: @10.Call: _13 = &lt;InStruct as InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
+56:5-56:29: @10.Call: _13 = &lt;main::InStruct as main::InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
 57:2-57:2: @11.Return: return">    };</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = InStruct { in_struct_field: const 101_u32 }
+<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = main::InStruct { in_struct_field: const 101_u32 }
 52:9-52:16: @10[4]: FakeRead(ForLet, _12)
 56:5-56:8: @10[7]: _14 = &amp;mut _12
-56:5-56:29: @10.Call: _13 = &lt;InStruct as InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
+56:5-56:29: @10.Call: _13 = &lt;main::InStruct as main::InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
 57:2-57:2: @11.Return: return"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = InStruct { in_struct_field: const 101_u32 }
+<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = main::InStruct { in_struct_field: const 101_u32 }
 52:9-52:16: @10[4]: FakeRead(ForLet, _12)
 56:5-56:8: @10[7]: _14 = &amp;mut _12
-56:5-56:29: @10.Call: _13 = &lt;InStruct as InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
+56:5-56:29: @10.Call: _13 = &lt;main::InStruct as main::InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
 57:2-57:2: @11.Return: return">    val.default_trait_func();</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = InStruct { in_struct_field: const 101_u32 }
+<span class="line"><span class="code even" style="--layer: 1" title="52:19-54:6: @10[3]: _12 = main::InStruct { in_struct_field: const 101_u32 }
 52:9-52:16: @10[4]: FakeRead(ForLet, _12)
 56:5-56:8: @10[7]: _14 = &amp;mut _12
-56:5-56:29: @10.Call: _13 = &lt;InStruct as InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
+56:5-56:29: @10.Call: _13 = &lt;main::InStruct as main::InTrait&gt;::default_trait_func(move _14) -&gt; [return: bb11, unwind: bb13]
 57:2-57:2: @11.Return: return">}<span class="annotation">⦉@10,11</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.lazy_boolean/lazy_boolean.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.lazy_boolean/lazy_boolean.main.-------.InstrumentCoverage.0.html
index 0cfe2119fbc..358e2e2bbba 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.lazy_boolean/lazy_boolean.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.lazy_boolean/lazy_boolean.main.-------.InstrumentCoverage.0.html
@@ -69,9 +69,9 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
@@ -79,9 +79,9 @@ For revisions in Pull Requests (PR):
 9:17-9:22: @3[6]: _6 = (_8.1: i32)
 9:24-9:29: @3[8]: _7 = (_8.2: i32)
 10:8-10:15: @3[12]: _10 = _1"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
@@ -89,9 +89,9 @@ For revisions in Pull Requests (PR):
 9:17-9:22: @3[6]: _6 = (_8.1: i32)
 9:24-9:29: @3[8]: _7 = (_8.2: i32)
 10:8-10:15: @3[12]: _10 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
@@ -99,9 +99,9 @@ For revisions in Pull Requests (PR):
 9:17-9:22: @3[6]: _6 = (_8.1: i32)
 9:24-9:29: @3[8]: _7 = (_8.2: i32)
 10:8-10:15: @3[12]: _10 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
@@ -109,9 +109,9 @@ For revisions in Pull Requests (PR):
 9:17-9:22: @3[6]: _6 = (_8.1: i32)
 9:24-9:29: @3[8]: _7 = (_8.2: i32)
 10:8-10:15: @3[12]: _10 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
@@ -119,9 +119,9 @@ For revisions in Pull Requests (PR):
 9:17-9:22: @3[6]: _6 = (_8.1: i32)
 9:24-9:29: @3[8]: _7 = (_8.2: i32)
 10:8-10:15: @3[12]: _10 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
@@ -129,9 +129,9 @@ For revisions in Pull Requests (PR):
 9:17-9:22: @3[6]: _6 = (_8.1: i32)
 9:24-9:29: @3[8]: _7 = (_8.2: i32)
 10:8-10:15: @3[12]: _10 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
@@ -139,9 +139,9 @@ For revisions in Pull Requests (PR):
 9:17-9:22: @3[6]: _6 = (_8.1: i32)
 9:24-9:29: @3[8]: _7 = (_8.2: i32)
 10:8-10:15: @3[12]: _10 = _1">    let (mut a, mut b, mut c) = (0, 0, 0);</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb36]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb36]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb35]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:33-9:42: @3[2]: _8 = (const 0_i32, const 0_i32, const 0_i32)
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.main.-------.InstrumentCoverage.0.html
index 54b1ea45cba..95e8f0b71ea 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.main.-------.InstrumentCoverage.0.html
@@ -80,14 +80,14 @@ For revisions in Pull Requests (PR):
 24:5-24:34: @0[23]: FakeRead(ForMatchedPlace, _13)
 24:5-24:34: @0[25]: _15 = (_13.0: &amp;DebugTest)
 24:5-24:34: @0[28]: _17 = &amp;(*_15)
-24:5-24:34: @0[30]: _18 = &lt;DebugTest as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-24:5-24:34: @0.Call: _16 = ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+24:5-24:34: @0[30]: _18 = &lt;DebugTest as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+24:5-24:34: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 24:5-24:34: @1[2]: _12 = [move _16]
 24:5-24:34: @1[5]: _11 = &amp;_12
 24:5-24:34: @1[6]: _10 = &amp;(*_11)
 24:5-24:34: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-24:5-24:34: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-24:5-24:34: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+24:5-24:34: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+24:5-24:34: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 24:5-24:34: @3[6]: _2 = const ()
 22:11-25:2: @3[8]: _0 = const ()
 25:2-25:2: @3.Return: return"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
@@ -102,14 +102,14 @@ For revisions in Pull Requests (PR):
 24:5-24:34: @0[23]: FakeRead(ForMatchedPlace, _13)
 24:5-24:34: @0[25]: _15 = (_13.0: &amp;DebugTest)
 24:5-24:34: @0[28]: _17 = &amp;(*_15)
-24:5-24:34: @0[30]: _18 = &lt;DebugTest as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-24:5-24:34: @0.Call: _16 = ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+24:5-24:34: @0[30]: _18 = &lt;DebugTest as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+24:5-24:34: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 24:5-24:34: @1[2]: _12 = [move _16]
 24:5-24:34: @1[5]: _11 = &amp;_12
 24:5-24:34: @1[6]: _10 = &amp;(*_11)
 24:5-24:34: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-24:5-24:34: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-24:5-24:34: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+24:5-24:34: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+24:5-24:34: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 24:5-24:34: @3[6]: _2 = const ()
 22:11-25:2: @3[8]: _0 = const ()
 25:2-25:2: @3.Return: return">    let debug_test = DebugTest;</span></span>
@@ -124,14 +124,14 @@ For revisions in Pull Requests (PR):
 24:5-24:34: @0[23]: FakeRead(ForMatchedPlace, _13)
 24:5-24:34: @0[25]: _15 = (_13.0: &amp;DebugTest)
 24:5-24:34: @0[28]: _17 = &amp;(*_15)
-24:5-24:34: @0[30]: _18 = &lt;DebugTest as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-24:5-24:34: @0.Call: _16 = ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+24:5-24:34: @0[30]: _18 = &lt;DebugTest as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+24:5-24:34: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 24:5-24:34: @1[2]: _12 = [move _16]
 24:5-24:34: @1[5]: _11 = &amp;_12
 24:5-24:34: @1[6]: _10 = &amp;(*_11)
 24:5-24:34: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-24:5-24:34: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-24:5-24:34: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+24:5-24:34: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+24:5-24:34: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 24:5-24:34: @3[6]: _2 = const ()
 22:11-25:2: @3[8]: _0 = const ()
 25:2-25:2: @3.Return: return">    println!("{:?}", debug_test);</span></span>
@@ -146,14 +146,14 @@ For revisions in Pull Requests (PR):
 24:5-24:34: @0[23]: FakeRead(ForMatchedPlace, _13)
 24:5-24:34: @0[25]: _15 = (_13.0: &amp;DebugTest)
 24:5-24:34: @0[28]: _17 = &amp;(*_15)
-24:5-24:34: @0[30]: _18 = &lt;DebugTest as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-24:5-24:34: @0.Call: _16 = ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
+24:5-24:34: @0[30]: _18 = &lt;DebugTest as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r DebugTest, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+24:5-24:34: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;DebugTest&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb4]
 24:5-24:34: @1[2]: _12 = [move _16]
 24:5-24:34: @1[5]: _11 = &amp;_12
 24:5-24:34: @1[6]: _10 = &amp;(*_11)
 24:5-24:34: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-24:5-24:34: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
-24:5-24:34: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb4]
+24:5-24:34: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb4]
+24:5-24:34: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb4]
 24:5-24:34: @3[6]: _2 = const ()
 22:11-25:2: @3[8]: _0 = const ()
 25:2-25:2: @3.Return: return">}<span class="annotation">⦉@0,1,2,3</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.{impl#0}-fmt.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.{impl#0}-fmt.-------.InstrumentCoverage.0.html
index b3f344f7fc0..f6f08b6a770 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.{impl#0}-fmt.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.loops_branches/loops_branches.{impl#0}-fmt.-------.InstrumentCoverage.0.html
@@ -77,20 +77,20 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code odd" style="--layer: 1" title="12:28-13:18: @8[0]: _7 = const ()">                }<span class="annotation">⦉@6,8</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">            }</span><span><span class="code even" style="--layer: 1" title="14:14-14:14: @3[0]: _5 = const ()"><span class="annotation">@3⦊</span>‸<span class="annotation">⦉@3</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">            </span><span><span class="code odd" style="--layer: 1" title="15:20-15:21: @9[6]: _13 = &amp;mut (*_2)
-15:23-15:30: @9[11]: _32 = const &lt;DebugTest as Debug&gt;::fmt::promoted[1]
+15:23-15:30: @9[11]: _32 = const &lt;DebugTest as std::fmt::Debug&gt;::fmt::promoted[1]
 15:23-15:30: @9[12]: _17 = &amp;(*_32)
 15:23-15:30: @9[13]: _16 = &amp;(*_17)
 15:23-15:30: @9[14]: _15 = move _16 as &amp;[&amp;str] (Pointer(Unsize))
 15:13-15:31: @9[20]: _23 = ()
 15:13-15:31: @9[21]: FakeRead(ForMatchedPlace, _23)
-15:13-15:31: @9[22]: _31 = const &lt;DebugTest as Debug&gt;::fmt::promoted[0]
+15:13-15:31: @9[22]: _31 = const &lt;DebugTest as std::fmt::Debug&gt;::fmt::promoted[0]
 15:13-15:31: @9[23]: _21 = &amp;(*_31)
 15:13-15:31: @9[24]: _20 = &amp;(*_21)
 15:13-15:31: @9[25]: _19 = move _20 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-15:13-15:31: @9.Call: _14 = Arguments::new_v1(move _15, move _19) -&gt; [return: bb10, unwind: bb21]
-15:13-15:31: @10.Call: _12 = Formatter::write_fmt(move _13, move _14) -&gt; [return: bb11, unwind: bb21]"><span class="annotation">@9,10,11,12⦊</span>write!(f, "error")<span class="annotation">⦉@9,10,11,12</span></span></span><span><span class="code even" style="--layer: 1" title="15:31-15:32: @16[1]: _25 = ((_11 as Err).0: std::fmt::Error)
+15:13-15:31: @9.Call: _14 = std::fmt::Arguments::new_v1(move _15, move _19) -&gt; [return: bb10, unwind: bb21]
+15:13-15:31: @10.Call: _12 = std::fmt::Formatter::write_fmt(move _13, move _14) -&gt; [return: bb11, unwind: bb21]"><span class="annotation">@9,10,11,12⦊</span>write!(f, "error")<span class="annotation">⦉@9,10,11,12</span></span></span><span><span class="code even" style="--layer: 1" title="15:31-15:32: @16[1]: _25 = ((_11 as Err).0: std::fmt::Error)
 15:31-15:32: @16[4]: _28 = _25
-15:31-15:32: @16.Call: _27 = &lt;std::fmt::Error as From&lt;std::fmt::Error&gt;&gt;::from(move _28) -&gt; [return: bb17, unwind: bb21]"><span class="annotation">@14,16,17,18⦊</span>?<span class="annotation">⦉@14,16,17,18</span></span></span><span class="code" style="--layer: 0">;</span></span>
+15:31-15:32: @16.Call: _27 = &lt;std::fmt::Error as std::convert::From&lt;std::fmt::Error&gt;&gt;::from(move _28) -&gt; [return: bb17, unwind: bb21]"><span class="annotation">@14,16,17,18⦊</span>?<span class="annotation">⦉@14,16,17,18</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">        } else </span><span><span class="code odd" style="--layer: 1" title="16:16-17:10: @2[0]: _3 = const ()"><span class="annotation">@2⦊</span>{</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="16:16-17:10: @2[0]: _3 = const ()">        }<span class="annotation">⦉@2</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code even" style="--layer: 1" title="18:12-18:14: @19[3]: _30 = ()
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.match_or_pattern/match_or_pattern.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.match_or_pattern/match_or_pattern.main.-------.InstrumentCoverage.0.html
index c7992614b5b..013c292ce9a 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.match_or_pattern/match_or_pattern.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.match_or_pattern/match_or_pattern.main.-------.InstrumentCoverage.0.html
@@ -69,9 +69,9 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -81,9 +81,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -93,9 +93,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -105,9 +105,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -117,9 +117,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -129,9 +129,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -141,9 +141,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -153,9 +153,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1">    let mut a: u8 = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
@@ -165,9 +165,9 @@ For revisions in Pull Requests (PR):
 10:9-10:14: @3[7]: FakeRead(ForLet, _6)
 10:16-10:18: @3[8]: AscribeUserType(_6, o, UserTypeProjection { base: UserType(3), projs: [] })
 11:8-11:15: @3[11]: _8 = _1">    let mut b: u8 = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb37]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb37]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb36]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:21-9:22: @3[2]: _5 = const 0_u8
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.nested_loops/nested_loops.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.nested_loops/nested_loops.main.-------.InstrumentCoverage.0.html
index 4dcf6c741dc..1abc24156d9 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.nested_loops/nested_loops.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.nested_loops/nested_loops.main.-------.InstrumentCoverage.0.html
@@ -69,23 +69,23 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 0"><span class="line"><span><span class="code even" style="--layer: 1" title="2:19-2:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb32]
+<div class="code" style="counter-reset: line 0"><span class="line"><span><span class="code even" style="--layer: 1" title="2:19-2:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb32]
 2:19-2:35: @1[0]: _3 = &amp;_4
-2:19-2:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb31]
+2:19-2:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb31]
 2:19-2:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 2:9-2:16: @2[3]: FakeRead(ForLet, _1)
 3:25-3:27: @3[2]: _5 = const 10_i32
 3:9-3:22: @3[3]: FakeRead(ForLet, _5)"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="2:19-2:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb32]
+<span class="line"><span class="code even" style="--layer: 1" title="2:19-2:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb32]
 2:19-2:35: @1[0]: _3 = &amp;_4
-2:19-2:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb31]
+2:19-2:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb31]
 2:19-2:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 2:9-2:16: @2[3]: FakeRead(ForLet, _1)
 3:25-3:27: @3[2]: _5 = const 10_i32
 3:9-3:22: @3[3]: FakeRead(ForLet, _5)">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="2:19-2:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb32]
+<span class="line"><span class="code even" style="--layer: 1" title="2:19-2:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb32]
 2:19-2:35: @1[0]: _3 = &amp;_4
-2:19-2:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb31]
+2:19-2:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb31]
 2:19-2:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 2:9-2:16: @2[3]: FakeRead(ForLet, _1)
 3:25-3:27: @3[2]: _5 = const 10_i32
@@ -107,7 +107,7 @@ For revisions in Pull Requests (PR):
 8:13-8:14: @16[4]: _15 = move _22
 8:13-8:14: @16[5]: _16 = const ()"><span class="annotation">@14,16⦊</span>_<span class="annotation">⦉@14,16</span></span></span><span class="code" style="--layer: 0"> in </span><span><span class="code even" style="--layer: 1" title="8:18-8:23: @11[5]: _19 = &amp;mut _14
 8:18-8:23: @11[6]: _18 = &amp;mut (*_19)
-8:18-8:23: @11.Call: _17 = &lt;std::ops::Range&lt;i32&gt; as Iterator&gt;::next(move _18) -&gt; [return: bb12, unwind: bb32]
+8:18-8:23: @11.Call: _17 = &lt;std::ops::Range&lt;i32&gt; as std::iter::Iterator&gt;::next(move _18) -&gt; [return: bb12, unwind: bb32]
 8:18-8:23: @12[1]: FakeRead(ForMatchedPlace, _17)"><span class="annotation">@10,11,12⦊</span>0..50<span class="annotation">⦉@10,11,12</span></span></span><span class="code" style="--layer: 0"> {</span></span>
 <span class="line"><span class="code" style="--layer: 0">            if </span><span><span class="code odd" style="--layer: 1" title="9:16-9:17: @16[15]: _27 = _9
 9:16-9:22: @16[16]: _26 = Lt(move _27, const 30_i32)"><span class="annotation">@14,16⦊</span>a &lt; 30<span class="annotation">⦉@14,16</span></span></span><span class="code" style="--layer: 0"> {</span></span>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.main.-------.InstrumentCoverage.0.html
index ca3515689d3..2a9b1b10efc 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.main.-------.InstrumentCoverage.0.html
@@ -89,13 +89,13 @@ For revisions in Pull Requests (PR):
 20:13-20:44: @8[23]: _23 = (_21.0: &amp;u32)
 20:13-20:44: @8[26]: _25 = &amp;(*_23)
 20:13-20:44: @8[28]: _26 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-20:13-20:44: @8.Call: _24 = ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
+20:13-20:44: @8.Call: _24 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
 20:13-20:44: @9[2]: _20 = [move _24]
 20:13-20:44: @9[5]: _19 = &amp;_20
 20:13-20:44: @9[6]: _18 = &amp;(*_19)
 20:13-20:44: @9[7]: _17 = move _18 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-20:13-20:44: @9.Call: _12 = Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
-20:13-20:44: @10.Call: _11 = _print(move _12) -&gt; [return: bb11, unwind: bb21]
+20:13-20:44: @9.Call: _12 = std::fmt::Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
+20:13-20:44: @10.Call: _11 = std::io::_print(move _12) -&gt; [return: bb11, unwind: bb21]
 20:13-20:44: @11[6]: _10 = const ()
 18:27-21:10: @11[8]: _6 = const ()"><span class="annotation">@6,8,9,10,11⦊</span>{</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="19:26-19:44: @6.Call: _9 = might_overflow(const 10_u32) -&gt; [return: bb8, unwind: bb21]
@@ -110,13 +110,13 @@ For revisions in Pull Requests (PR):
 20:13-20:44: @8[23]: _23 = (_21.0: &amp;u32)
 20:13-20:44: @8[26]: _25 = &amp;(*_23)
 20:13-20:44: @8[28]: _26 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-20:13-20:44: @8.Call: _24 = ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
+20:13-20:44: @8.Call: _24 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
 20:13-20:44: @9[2]: _20 = [move _24]
 20:13-20:44: @9[5]: _19 = &amp;_20
 20:13-20:44: @9[6]: _18 = &amp;(*_19)
 20:13-20:44: @9[7]: _17 = move _18 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-20:13-20:44: @9.Call: _12 = Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
-20:13-20:44: @10.Call: _11 = _print(move _12) -&gt; [return: bb11, unwind: bb21]
+20:13-20:44: @9.Call: _12 = std::fmt::Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
+20:13-20:44: @10.Call: _11 = std::io::_print(move _12) -&gt; [return: bb11, unwind: bb21]
 20:13-20:44: @11[6]: _10 = const ()
 18:27-21:10: @11[8]: _6 = const ()">            let result = might_overflow(10);</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="19:26-19:44: @6.Call: _9 = might_overflow(const 10_u32) -&gt; [return: bb8, unwind: bb21]
@@ -131,13 +131,13 @@ For revisions in Pull Requests (PR):
 20:13-20:44: @8[23]: _23 = (_21.0: &amp;u32)
 20:13-20:44: @8[26]: _25 = &amp;(*_23)
 20:13-20:44: @8[28]: _26 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-20:13-20:44: @8.Call: _24 = ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
+20:13-20:44: @8.Call: _24 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
 20:13-20:44: @9[2]: _20 = [move _24]
 20:13-20:44: @9[5]: _19 = &amp;_20
 20:13-20:44: @9[6]: _18 = &amp;(*_19)
 20:13-20:44: @9[7]: _17 = move _18 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-20:13-20:44: @9.Call: _12 = Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
-20:13-20:44: @10.Call: _11 = _print(move _12) -&gt; [return: bb11, unwind: bb21]
+20:13-20:44: @9.Call: _12 = std::fmt::Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
+20:13-20:44: @10.Call: _11 = std::io::_print(move _12) -&gt; [return: bb11, unwind: bb21]
 20:13-20:44: @11[6]: _10 = const ()
 18:27-21:10: @11[8]: _6 = const ()">            println!("Result: {}", result);</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="19:26-19:44: @6.Call: _9 = might_overflow(const 10_u32) -&gt; [return: bb8, unwind: bb21]
@@ -152,13 +152,13 @@ For revisions in Pull Requests (PR):
 20:13-20:44: @8[23]: _23 = (_21.0: &amp;u32)
 20:13-20:44: @8[26]: _25 = &amp;(*_23)
 20:13-20:44: @8[28]: _26 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-20:13-20:44: @8.Call: _24 = ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
+20:13-20:44: @8.Call: _24 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _25, move _26) -&gt; [return: bb9, unwind: bb21]
 20:13-20:44: @9[2]: _20 = [move _24]
 20:13-20:44: @9[5]: _19 = &amp;_20
 20:13-20:44: @9[6]: _18 = &amp;(*_19)
 20:13-20:44: @9[7]: _17 = move _18 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-20:13-20:44: @9.Call: _12 = Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
-20:13-20:44: @10.Call: _11 = _print(move _12) -&gt; [return: bb11, unwind: bb21]
+20:13-20:44: @9.Call: _12 = std::fmt::Arguments::new_v1(move _13, move _17) -&gt; [return: bb10, unwind: bb21]
+20:13-20:44: @10.Call: _11 = std::io::_print(move _12) -&gt; [return: bb11, unwind: bb21]
 20:13-20:44: @11[6]: _10 = const ()
 18:27-21:10: @11[8]: _6 = const ()">        }<span class="annotation">⦉@6,8,9,10,11</span></span></span><span class="code" style="--layer: 0"> else if </span><span><span class="code even" style="--layer: 1" title="21:19-21:28: @7[2]: _28 = _1
 21:19-21:32: @7[3]: _27 = Lt(move _28, const 5_i32)"><span class="annotation">@7⦊</span>countdown &lt; 5<span class="annotation">⦉@7</span></span></span><span class="code" style="--layer: 0"> </span><span><span class="code odd" style="--layer: 1" title="22:26-22:43: @12.Call: _29 = might_overflow(const 1_u32) -&gt; [return: bb14, unwind: bb21]
@@ -173,13 +173,13 @@ For revisions in Pull Requests (PR):
 23:13-23:44: @14[23]: _43 = (_41.0: &amp;u32)
 23:13-23:44: @14[26]: _45 = &amp;(*_43)
 23:13-23:44: @14[28]: _46 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-23:13-23:44: @14.Call: _44 = ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
+23:13-23:44: @14.Call: _44 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
 23:13-23:44: @15[2]: _40 = [move _44]
 23:13-23:44: @15[5]: _39 = &amp;_40
 23:13-23:44: @15[6]: _38 = &amp;(*_39)
 23:13-23:44: @15[7]: _37 = move _38 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-23:13-23:44: @15.Call: _32 = Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
-23:13-23:44: @16.Call: _31 = _print(move _32) -&gt; [return: bb17, unwind: bb21]
+23:13-23:44: @15.Call: _32 = std::fmt::Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
+23:13-23:44: @16.Call: _31 = std::io::_print(move _32) -&gt; [return: bb17, unwind: bb21]
 23:13-23:44: @17[6]: _30 = const ()
 21:33-24:10: @17[8]: _6 = const ()"><span class="annotation">@12,14,15,16,17⦊</span>{</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="22:26-22:43: @12.Call: _29 = might_overflow(const 1_u32) -&gt; [return: bb14, unwind: bb21]
@@ -194,13 +194,13 @@ For revisions in Pull Requests (PR):
 23:13-23:44: @14[23]: _43 = (_41.0: &amp;u32)
 23:13-23:44: @14[26]: _45 = &amp;(*_43)
 23:13-23:44: @14[28]: _46 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-23:13-23:44: @14.Call: _44 = ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
+23:13-23:44: @14.Call: _44 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
 23:13-23:44: @15[2]: _40 = [move _44]
 23:13-23:44: @15[5]: _39 = &amp;_40
 23:13-23:44: @15[6]: _38 = &amp;(*_39)
 23:13-23:44: @15[7]: _37 = move _38 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-23:13-23:44: @15.Call: _32 = Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
-23:13-23:44: @16.Call: _31 = _print(move _32) -&gt; [return: bb17, unwind: bb21]
+23:13-23:44: @15.Call: _32 = std::fmt::Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
+23:13-23:44: @16.Call: _31 = std::io::_print(move _32) -&gt; [return: bb17, unwind: bb21]
 23:13-23:44: @17[6]: _30 = const ()
 21:33-24:10: @17[8]: _6 = const ()">            let result = might_overflow(1);</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="22:26-22:43: @12.Call: _29 = might_overflow(const 1_u32) -&gt; [return: bb14, unwind: bb21]
@@ -215,13 +215,13 @@ For revisions in Pull Requests (PR):
 23:13-23:44: @14[23]: _43 = (_41.0: &amp;u32)
 23:13-23:44: @14[26]: _45 = &amp;(*_43)
 23:13-23:44: @14[28]: _46 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-23:13-23:44: @14.Call: _44 = ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
+23:13-23:44: @14.Call: _44 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
 23:13-23:44: @15[2]: _40 = [move _44]
 23:13-23:44: @15[5]: _39 = &amp;_40
 23:13-23:44: @15[6]: _38 = &amp;(*_39)
 23:13-23:44: @15[7]: _37 = move _38 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-23:13-23:44: @15.Call: _32 = Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
-23:13-23:44: @16.Call: _31 = _print(move _32) -&gt; [return: bb17, unwind: bb21]
+23:13-23:44: @15.Call: _32 = std::fmt::Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
+23:13-23:44: @16.Call: _31 = std::io::_print(move _32) -&gt; [return: bb17, unwind: bb21]
 23:13-23:44: @17[6]: _30 = const ()
 21:33-24:10: @17[8]: _6 = const ()">            println!("Result: {}", result);</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="22:26-22:43: @12.Call: _29 = might_overflow(const 1_u32) -&gt; [return: bb14, unwind: bb21]
@@ -236,13 +236,13 @@ For revisions in Pull Requests (PR):
 23:13-23:44: @14[23]: _43 = (_41.0: &amp;u32)
 23:13-23:44: @14[26]: _45 = &amp;(*_43)
 23:13-23:44: @14[28]: _46 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-23:13-23:44: @14.Call: _44 = ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
+23:13-23:44: @14.Call: _44 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _45, move _46) -&gt; [return: bb15, unwind: bb21]
 23:13-23:44: @15[2]: _40 = [move _44]
 23:13-23:44: @15[5]: _39 = &amp;_40
 23:13-23:44: @15[6]: _38 = &amp;(*_39)
 23:13-23:44: @15[7]: _37 = move _38 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-23:13-23:44: @15.Call: _32 = Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
-23:13-23:44: @16.Call: _31 = _print(move _32) -&gt; [return: bb17, unwind: bb21]
+23:13-23:44: @15.Call: _32 = std::fmt::Arguments::new_v1(move _33, move _37) -&gt; [return: bb16, unwind: bb21]
+23:13-23:44: @16.Call: _31 = std::io::_print(move _32) -&gt; [return: bb17, unwind: bb21]
 23:13-23:44: @17[6]: _30 = const ()
 21:33-24:10: @17[8]: _6 = const ()">        }<span class="annotation">⦉@12,14,15,16,17</span></span></span><span><span class="code even" style="--layer: 1" title="24:10-24:10: @13[0]: _6 = const ()"><span class="annotation">@13⦊</span>‸<span class="annotation">⦉@13</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code odd" style="--layer: 1" title="25:9-25:23: @19[2]: _47 = CheckedSub(_1, const 1_i32)
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.might_overflow.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.might_overflow.-------.InstrumentCoverage.0.html
index f86cc4b2d2a..c6043f0bd07 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.might_overflow.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.overflow/overflow.might_overflow.-------.InstrumentCoverage.0.html
@@ -82,8 +82,8 @@ For revisions in Pull Requests (PR):
 6:9-6:49: @1[18]: _14 = &amp;(*_60)
 6:9-6:49: @1[19]: _13 = &amp;(*_14)
 6:9-6:49: @1[20]: _12 = move _13 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-6:9-6:49: @1.Call: _7 = Arguments::new_v1(move _8, move _12) -&gt; [return: bb3, unwind: bb14]
-6:9-6:49: @3.Call: _6 = _print(move _7) -&gt; [return: bb4, unwind: bb14]
+6:9-6:49: @1.Call: _7 = std::fmt::Arguments::new_v1(move _8, move _12) -&gt; [return: bb3, unwind: bb14]
+6:9-6:49: @3.Call: _6 = std::io::_print(move _7) -&gt; [return: bb4, unwind: bb14]
 6:9-6:49: @4[5]: _5 = const ()
 5:19-7:6: @4[7]: _2 = const ()"><span class="annotation">@1,3,4⦊</span>{</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="6:18-6:47: @1[6]: _61 = const might_overflow::promoted[4]
@@ -96,8 +96,8 @@ For revisions in Pull Requests (PR):
 6:9-6:49: @1[18]: _14 = &amp;(*_60)
 6:9-6:49: @1[19]: _13 = &amp;(*_14)
 6:9-6:49: @1[20]: _12 = move _13 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-6:9-6:49: @1.Call: _7 = Arguments::new_v1(move _8, move _12) -&gt; [return: bb3, unwind: bb14]
-6:9-6:49: @3.Call: _6 = _print(move _7) -&gt; [return: bb4, unwind: bb14]
+6:9-6:49: @1.Call: _7 = std::fmt::Arguments::new_v1(move _8, move _12) -&gt; [return: bb3, unwind: bb14]
+6:9-6:49: @3.Call: _6 = std::io::_print(move _7) -&gt; [return: bb4, unwind: bb14]
 6:9-6:49: @4[5]: _5 = const ()
 5:19-7:6: @4[7]: _2 = const ()">        println!("this will probably overflow");</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="6:18-6:47: @1[6]: _61 = const might_overflow::promoted[4]
@@ -110,8 +110,8 @@ For revisions in Pull Requests (PR):
 6:9-6:49: @1[18]: _14 = &amp;(*_60)
 6:9-6:49: @1[19]: _13 = &amp;(*_14)
 6:9-6:49: @1[20]: _12 = move _13 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-6:9-6:49: @1.Call: _7 = Arguments::new_v1(move _8, move _12) -&gt; [return: bb3, unwind: bb14]
-6:9-6:49: @3.Call: _6 = _print(move _7) -&gt; [return: bb4, unwind: bb14]
+6:9-6:49: @1.Call: _7 = std::fmt::Arguments::new_v1(move _8, move _12) -&gt; [return: bb3, unwind: bb14]
+6:9-6:49: @3.Call: _6 = std::io::_print(move _7) -&gt; [return: bb4, unwind: bb14]
 6:9-6:49: @4[5]: _5 = const ()
 5:19-7:6: @4[7]: _2 = const ()">    }<span class="annotation">⦉@1,3,4</span></span></span><span><span class="code even" style="--layer: 1" title="7:6-7:6: @2[0]: _2 = const ()"><span class="annotation">@2⦊</span>‸<span class="annotation">⦉@2</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code odd" style="--layer: 1" title="8:18-8:30: @5[3]: _18 = CheckedSub(const core::num::&lt;impl u32&gt;::MAX, const 5_u32)
@@ -129,16 +129,16 @@ For revisions in Pull Requests (PR):
 9:5-9:56: @6[29]: _34 = (_30.1: &amp;u32)
 9:5-9:56: @6[32]: _36 = &amp;(*_33)
 9:5-9:56: @6[34]: _37 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @6.Call: _35 = ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
+9:5-9:56: @6.Call: _35 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
 9:5-9:56: @7[4]: _39 = &amp;(*_34)
 9:5-9:56: @7[6]: _40 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @7.Call: _38 = ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
+9:5-9:56: @7.Call: _38 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
 9:5-9:56: @8[2]: _29 = [move _35, move _38]
 9:5-9:56: @8[7]: _28 = &amp;_29
 9:5-9:56: @8[8]: _27 = &amp;(*_28)
 9:5-9:56: @8[9]: _26 = move _27 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:5-9:56: @8.Call: _21 = Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
-9:5-9:56: @9.Call: _20 = _print(move _21) -&gt; [return: bb10, unwind: bb14]
+9:5-9:56: @8.Call: _21 = std::fmt::Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
+9:5-9:56: @9.Call: _20 = std::io::_print(move _21) -&gt; [return: bb10, unwind: bb14]
 9:5-9:56: @10[6]: _19 = const ()
 10:18-10:24: @10[10]: _42 = _1
 10:27-10:33: @10[12]: _43 = _17
@@ -155,8 +155,8 @@ For revisions in Pull Requests (PR):
 11:5-11:49: @11[22]: _54 = &amp;(*_57)
 11:5-11:49: @11[23]: _53 = &amp;(*_54)
 11:5-11:49: @11[24]: _52 = move _53 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-11:49: @11.Call: _47 = Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
-11:5-11:49: @12.Call: _46 = _print(move _47) -&gt; [return: bb13, unwind: bb14]
+11:5-11:49: @11.Call: _47 = std::fmt::Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
+11:5-11:49: @12.Call: _46 = std::io::_print(move _47) -&gt; [return: bb13, unwind: bb14]
 11:5-11:49: @13[5]: _45 = const ()
 12:5-12:11: @13[7]: _0 = _41
 13:2-13:2: @13.Return: return"><span class="annotation">@5,6,7,8,9,10,11,12,13⦊</span>add_to = u32::MAX - 5;</span></span>
@@ -175,16 +175,16 @@ For revisions in Pull Requests (PR):
 9:5-9:56: @6[29]: _34 = (_30.1: &amp;u32)
 9:5-9:56: @6[32]: _36 = &amp;(*_33)
 9:5-9:56: @6[34]: _37 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @6.Call: _35 = ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
+9:5-9:56: @6.Call: _35 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
 9:5-9:56: @7[4]: _39 = &amp;(*_34)
 9:5-9:56: @7[6]: _40 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @7.Call: _38 = ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
+9:5-9:56: @7.Call: _38 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
 9:5-9:56: @8[2]: _29 = [move _35, move _38]
 9:5-9:56: @8[7]: _28 = &amp;_29
 9:5-9:56: @8[8]: _27 = &amp;(*_28)
 9:5-9:56: @8[9]: _26 = move _27 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:5-9:56: @8.Call: _21 = Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
-9:5-9:56: @9.Call: _20 = _print(move _21) -&gt; [return: bb10, unwind: bb14]
+9:5-9:56: @8.Call: _21 = std::fmt::Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
+9:5-9:56: @9.Call: _20 = std::io::_print(move _21) -&gt; [return: bb10, unwind: bb14]
 9:5-9:56: @10[6]: _19 = const ()
 10:18-10:24: @10[10]: _42 = _1
 10:27-10:33: @10[12]: _43 = _17
@@ -201,8 +201,8 @@ For revisions in Pull Requests (PR):
 11:5-11:49: @11[22]: _54 = &amp;(*_57)
 11:5-11:49: @11[23]: _53 = &amp;(*_54)
 11:5-11:49: @11[24]: _52 = move _53 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-11:49: @11.Call: _47 = Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
-11:5-11:49: @12.Call: _46 = _print(move _47) -&gt; [return: bb13, unwind: bb14]
+11:5-11:49: @11.Call: _47 = std::fmt::Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
+11:5-11:49: @12.Call: _46 = std::io::_print(move _47) -&gt; [return: bb13, unwind: bb14]
 11:5-11:49: @13[5]: _45 = const ()
 12:5-12:11: @13[7]: _0 = _41
 13:2-13:2: @13.Return: return">    println!("does {} + {} overflow?", add_to, to_add);</span></span>
@@ -221,16 +221,16 @@ For revisions in Pull Requests (PR):
 9:5-9:56: @6[29]: _34 = (_30.1: &amp;u32)
 9:5-9:56: @6[32]: _36 = &amp;(*_33)
 9:5-9:56: @6[34]: _37 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @6.Call: _35 = ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
+9:5-9:56: @6.Call: _35 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
 9:5-9:56: @7[4]: _39 = &amp;(*_34)
 9:5-9:56: @7[6]: _40 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @7.Call: _38 = ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
+9:5-9:56: @7.Call: _38 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
 9:5-9:56: @8[2]: _29 = [move _35, move _38]
 9:5-9:56: @8[7]: _28 = &amp;_29
 9:5-9:56: @8[8]: _27 = &amp;(*_28)
 9:5-9:56: @8[9]: _26 = move _27 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:5-9:56: @8.Call: _21 = Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
-9:5-9:56: @9.Call: _20 = _print(move _21) -&gt; [return: bb10, unwind: bb14]
+9:5-9:56: @8.Call: _21 = std::fmt::Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
+9:5-9:56: @9.Call: _20 = std::io::_print(move _21) -&gt; [return: bb10, unwind: bb14]
 9:5-9:56: @10[6]: _19 = const ()
 10:18-10:24: @10[10]: _42 = _1
 10:27-10:33: @10[12]: _43 = _17
@@ -247,8 +247,8 @@ For revisions in Pull Requests (PR):
 11:5-11:49: @11[22]: _54 = &amp;(*_57)
 11:5-11:49: @11[23]: _53 = &amp;(*_54)
 11:5-11:49: @11[24]: _52 = move _53 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-11:49: @11.Call: _47 = Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
-11:5-11:49: @12.Call: _46 = _print(move _47) -&gt; [return: bb13, unwind: bb14]
+11:5-11:49: @11.Call: _47 = std::fmt::Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
+11:5-11:49: @12.Call: _46 = std::io::_print(move _47) -&gt; [return: bb13, unwind: bb14]
 11:5-11:49: @13[5]: _45 = const ()
 12:5-12:11: @13[7]: _0 = _41
 13:2-13:2: @13.Return: return">    let result = to_add + add_to;</span></span>
@@ -267,16 +267,16 @@ For revisions in Pull Requests (PR):
 9:5-9:56: @6[29]: _34 = (_30.1: &amp;u32)
 9:5-9:56: @6[32]: _36 = &amp;(*_33)
 9:5-9:56: @6[34]: _37 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @6.Call: _35 = ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
+9:5-9:56: @6.Call: _35 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
 9:5-9:56: @7[4]: _39 = &amp;(*_34)
 9:5-9:56: @7[6]: _40 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @7.Call: _38 = ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
+9:5-9:56: @7.Call: _38 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
 9:5-9:56: @8[2]: _29 = [move _35, move _38]
 9:5-9:56: @8[7]: _28 = &amp;_29
 9:5-9:56: @8[8]: _27 = &amp;(*_28)
 9:5-9:56: @8[9]: _26 = move _27 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:5-9:56: @8.Call: _21 = Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
-9:5-9:56: @9.Call: _20 = _print(move _21) -&gt; [return: bb10, unwind: bb14]
+9:5-9:56: @8.Call: _21 = std::fmt::Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
+9:5-9:56: @9.Call: _20 = std::io::_print(move _21) -&gt; [return: bb10, unwind: bb14]
 9:5-9:56: @10[6]: _19 = const ()
 10:18-10:24: @10[10]: _42 = _1
 10:27-10:33: @10[12]: _43 = _17
@@ -293,8 +293,8 @@ For revisions in Pull Requests (PR):
 11:5-11:49: @11[22]: _54 = &amp;(*_57)
 11:5-11:49: @11[23]: _53 = &amp;(*_54)
 11:5-11:49: @11[24]: _52 = move _53 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-11:49: @11.Call: _47 = Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
-11:5-11:49: @12.Call: _46 = _print(move _47) -&gt; [return: bb13, unwind: bb14]
+11:5-11:49: @11.Call: _47 = std::fmt::Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
+11:5-11:49: @12.Call: _46 = std::io::_print(move _47) -&gt; [return: bb13, unwind: bb14]
 11:5-11:49: @13[5]: _45 = const ()
 12:5-12:11: @13[7]: _0 = _41
 13:2-13:2: @13.Return: return">    println!("continuing after overflow check");</span></span>
@@ -313,16 +313,16 @@ For revisions in Pull Requests (PR):
 9:5-9:56: @6[29]: _34 = (_30.1: &amp;u32)
 9:5-9:56: @6[32]: _36 = &amp;(*_33)
 9:5-9:56: @6[34]: _37 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @6.Call: _35 = ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
+9:5-9:56: @6.Call: _35 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
 9:5-9:56: @7[4]: _39 = &amp;(*_34)
 9:5-9:56: @7[6]: _40 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @7.Call: _38 = ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
+9:5-9:56: @7.Call: _38 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
 9:5-9:56: @8[2]: _29 = [move _35, move _38]
 9:5-9:56: @8[7]: _28 = &amp;_29
 9:5-9:56: @8[8]: _27 = &amp;(*_28)
 9:5-9:56: @8[9]: _26 = move _27 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:5-9:56: @8.Call: _21 = Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
-9:5-9:56: @9.Call: _20 = _print(move _21) -&gt; [return: bb10, unwind: bb14]
+9:5-9:56: @8.Call: _21 = std::fmt::Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
+9:5-9:56: @9.Call: _20 = std::io::_print(move _21) -&gt; [return: bb10, unwind: bb14]
 9:5-9:56: @10[6]: _19 = const ()
 10:18-10:24: @10[10]: _42 = _1
 10:27-10:33: @10[12]: _43 = _17
@@ -339,8 +339,8 @@ For revisions in Pull Requests (PR):
 11:5-11:49: @11[22]: _54 = &amp;(*_57)
 11:5-11:49: @11[23]: _53 = &amp;(*_54)
 11:5-11:49: @11[24]: _52 = move _53 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-11:49: @11.Call: _47 = Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
-11:5-11:49: @12.Call: _46 = _print(move _47) -&gt; [return: bb13, unwind: bb14]
+11:5-11:49: @11.Call: _47 = std::fmt::Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
+11:5-11:49: @12.Call: _46 = std::io::_print(move _47) -&gt; [return: bb13, unwind: bb14]
 11:5-11:49: @13[5]: _45 = const ()
 12:5-12:11: @13[7]: _0 = _41
 13:2-13:2: @13.Return: return">    result</span></span>
@@ -359,16 +359,16 @@ For revisions in Pull Requests (PR):
 9:5-9:56: @6[29]: _34 = (_30.1: &amp;u32)
 9:5-9:56: @6[32]: _36 = &amp;(*_33)
 9:5-9:56: @6[34]: _37 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @6.Call: _35 = ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
+9:5-9:56: @6.Call: _35 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _36, move _37) -&gt; [return: bb7, unwind: bb14]
 9:5-9:56: @7[4]: _39 = &amp;(*_34)
 9:5-9:56: @7[6]: _40 = &lt;u32 as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r u32, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-9:5-9:56: @7.Call: _38 = ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
+9:5-9:56: @7.Call: _38 = std::fmt::ArgumentV1::new::&lt;u32&gt;(move _39, move _40) -&gt; [return: bb8, unwind: bb14]
 9:5-9:56: @8[2]: _29 = [move _35, move _38]
 9:5-9:56: @8[7]: _28 = &amp;_29
 9:5-9:56: @8[8]: _27 = &amp;(*_28)
 9:5-9:56: @8[9]: _26 = move _27 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:5-9:56: @8.Call: _21 = Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
-9:5-9:56: @9.Call: _20 = _print(move _21) -&gt; [return: bb10, unwind: bb14]
+9:5-9:56: @8.Call: _21 = std::fmt::Arguments::new_v1(move _22, move _26) -&gt; [return: bb9, unwind: bb14]
+9:5-9:56: @9.Call: _20 = std::io::_print(move _21) -&gt; [return: bb10, unwind: bb14]
 9:5-9:56: @10[6]: _19 = const ()
 10:18-10:24: @10[10]: _42 = _1
 10:27-10:33: @10[12]: _43 = _17
@@ -385,8 +385,8 @@ For revisions in Pull Requests (PR):
 11:5-11:49: @11[22]: _54 = &amp;(*_57)
 11:5-11:49: @11[23]: _53 = &amp;(*_54)
 11:5-11:49: @11[24]: _52 = move _53 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-11:5-11:49: @11.Call: _47 = Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
-11:5-11:49: @12.Call: _46 = _print(move _47) -&gt; [return: bb13, unwind: bb14]
+11:5-11:49: @11.Call: _47 = std::fmt::Arguments::new_v1(move _48, move _52) -&gt; [return: bb12, unwind: bb14]
+11:5-11:49: @12.Call: _46 = std::io::_print(move _47) -&gt; [return: bb13, unwind: bb14]
 11:5-11:49: @13[5]: _45 = const ()
 12:5-12:11: @13[7]: _0 = _41
 13:2-13:2: @13.Return: return">}<span class="annotation">⦉@5,6,7,8,9,10,11,12,13</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.panic_unwind/panic_unwind.might_panic.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.panic_unwind/panic_unwind.might_panic.-------.InstrumentCoverage.0.html
index 86d9875b47c..32988629ba0 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.panic_unwind/panic_unwind.might_panic.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.panic_unwind/panic_unwind.might_panic.-------.InstrumentCoverage.0.html
@@ -81,10 +81,10 @@ For revisions in Pull Requests (PR):
 6:9-6:34: @1[18]: _13 = &amp;(*_32)
 6:9-6:34: @1[19]: _12 = &amp;(*_13)
 6:9-6:34: @1[20]: _11 = move _12 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-6:9-6:34: @1.Call: _6 = Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
-6:9-6:34: @3.Call: _5 = _print(move _6) -&gt; [return: bb4, unwind: bb7]
+6:9-6:34: @1.Call: _6 = std::fmt::Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
+6:9-6:34: @3.Call: _5 = std::io::_print(move _6) -&gt; [return: bb4, unwind: bb7]
 6:9-6:34: @4[5]: _4 = const ()
-7:9-7:26: @4.Call: begin_panic::&lt;&amp;str&gt;(const &quot;panics&quot;) -&gt; bb7"><span class="annotation">@1,3,4⦊</span>println!("panicking...");</span></span>
+7:9-7:26: @4.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;panics&quot;) -&gt; bb7"><span class="annotation">@1,3,4⦊</span>println!("panicking...");</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="6:18-6:32: @1[6]: _33 = const might_panic::promoted[3]
 6:18-6:32: @1[7]: _9 = &amp;(*_33)
 6:18-6:32: @1[8]: _8 = &amp;(*_9)
@@ -95,10 +95,10 @@ For revisions in Pull Requests (PR):
 6:9-6:34: @1[18]: _13 = &amp;(*_32)
 6:9-6:34: @1[19]: _12 = &amp;(*_13)
 6:9-6:34: @1[20]: _11 = move _12 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-6:9-6:34: @1.Call: _6 = Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
-6:9-6:34: @3.Call: _5 = _print(move _6) -&gt; [return: bb4, unwind: bb7]
+6:9-6:34: @1.Call: _6 = std::fmt::Arguments::new_v1(move _7, move _11) -&gt; [return: bb3, unwind: bb7]
+6:9-6:34: @3.Call: _5 = std::io::_print(move _6) -&gt; [return: bb4, unwind: bb7]
 6:9-6:34: @4[5]: _4 = const ()
-7:9-7:26: @4.Call: begin_panic::&lt;&amp;str&gt;(const &quot;panics&quot;) -&gt; bb7">        panic!("panics");<span class="annotation">⦉@1,3,4</span></span></span><span class="code" style="--layer: 0"></span></span>
+7:9-7:26: @4.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;panics&quot;) -&gt; bb7">        panic!("panics");<span class="annotation">⦉@1,3,4</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    } else </span><span><span class="code even" style="--layer: 1" title="9:18-9:31: @2[6]: _31 = const might_panic::promoted[1]
 9:18-9:31: @2[7]: _23 = &amp;(*_31)
 9:18-9:31: @2[8]: _22 = &amp;(*_23)
@@ -109,8 +109,8 @@ For revisions in Pull Requests (PR):
 9:9-9:33: @2[18]: _27 = &amp;(*_30)
 9:9-9:33: @2[19]: _26 = &amp;(*_27)
 9:9-9:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:9-9:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-9:9-9:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+9:9-9:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+9:9-9:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 9:9-9:33: @6[5]: _18 = const ()
 8:12-10:6: @6[7]: _0 = const ()
 11:2-11:2: @6.Return: return"><span class="annotation">@2,5,6⦊</span>{</span></span>
@@ -124,8 +124,8 @@ For revisions in Pull Requests (PR):
 9:9-9:33: @2[18]: _27 = &amp;(*_30)
 9:9-9:33: @2[19]: _26 = &amp;(*_27)
 9:9-9:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:9-9:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-9:9-9:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+9:9-9:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+9:9-9:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 9:9-9:33: @6[5]: _18 = const ()
 8:12-10:6: @6[7]: _0 = const ()
 11:2-11:2: @6.Return: return">        println!("Don't Panic");</span></span>
@@ -139,8 +139,8 @@ For revisions in Pull Requests (PR):
 9:9-9:33: @2[18]: _27 = &amp;(*_30)
 9:9-9:33: @2[19]: _26 = &amp;(*_27)
 9:9-9:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:9-9:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-9:9-9:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+9:9-9:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+9:9-9:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 9:9-9:33: @6[5]: _18 = const ()
 8:12-10:6: @6[7]: _0 = const ()
 11:2-11:2: @6.Return: return">    }</span></span>
@@ -154,8 +154,8 @@ For revisions in Pull Requests (PR):
 9:9-9:33: @2[18]: _27 = &amp;(*_30)
 9:9-9:33: @2[19]: _26 = &amp;(*_27)
 9:9-9:33: @2[20]: _25 = move _26 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-9:9-9:33: @2.Call: _20 = Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
-9:9-9:33: @5.Call: _19 = _print(move _20) -&gt; [return: bb6, unwind: bb7]
+9:9-9:33: @2.Call: _20 = std::fmt::Arguments::new_v1(move _21, move _25) -&gt; [return: bb5, unwind: bb7]
+9:9-9:33: @5.Call: _19 = std::io::_print(move _20) -&gt; [return: bb6, unwind: bb7]
 9:9-9:33: @6[5]: _18 = const ()
 8:12-10:6: @6[7]: _0 = const ()
 11:2-11:2: @6.Return: return">}<span class="annotation">⦉@2,5,6</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.main.-------.InstrumentCoverage.0.html
index 6d9d63deccf..3e307c4f460 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.main.-------.InstrumentCoverage.0.html
@@ -81,7 +81,7 @@ For revisions in Pull Requests (PR):
 25:49-25:62: @2[20]: _16 = &amp;_2
 25:64-25:77: @2[24]: _19 = &amp;_1
 25:80-25:93: @2[26]: _20 = &amp;_2
-25:64-25:93: @2.Call: _18 = &lt;Version as PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
+25:64-25:93: @2.Call: _18 = &lt;Version as std::cmp::PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
 25:64-25:93: @3[2]: _17 = &amp;_18
 25:5-25:95: @3[3]: _14 = (move _15, move _16, move _17)
 25:5-25:95: @3[7]: FakeRead(ForMatchedPlace, _14)
@@ -89,20 +89,20 @@ For revisions in Pull Requests (PR):
 25:5-25:95: @3[11]: _22 = (_14.1: &amp;Version)
 25:5-25:95: @3[13]: _23 = (_14.2: &amp;bool)
 25:5-25:95: @3[16]: _25 = &amp;(*_21)
-25:5-25:95: @3[18]: _26 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @3.Call: _24 = ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
+25:5-25:95: @3[18]: _26 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @3.Call: _24 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
 25:5-25:95: @4[4]: _28 = &amp;(*_22)
-25:5-25:95: @4[6]: _29 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @4.Call: _27 = ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
+25:5-25:95: @4[6]: _29 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @4.Call: _27 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
 25:5-25:95: @5[4]: _31 = &amp;(*_23)
 25:5-25:95: @5[6]: _32 = &lt;bool as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r bool, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @5.Call: _30 = ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
+25:5-25:95: @5.Call: _30 = std::fmt::ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
 25:5-25:95: @6[2]: _13 = [move _24, move _27, move _30]
 25:5-25:95: @6[9]: _12 = &amp;_13
 25:5-25:95: @6[10]: _11 = &amp;(*_12)
 25:5-25:95: @6[11]: _10 = move _11 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-25:5-25:95: @6.Call: _5 = Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
-25:5-25:95: @7.Call: _4 = _print(move _5) -&gt; [return: bb8, unwind: bb9]
+25:5-25:95: @6.Call: _5 = std::fmt::Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
+25:5-25:95: @7.Call: _4 = std::io::_print(move _5) -&gt; [return: bb8, unwind: bb9]
 25:5-25:95: @8[7]: _3 = const ()
 21:11-26:2: @8[9]: _0 = const ()
 26:2-26:2: @8.Return: return"><span class="annotation">@0,1,2,3,4,5,6,7,8⦊</span>fn main() {</span></span>
@@ -118,7 +118,7 @@ For revisions in Pull Requests (PR):
 25:49-25:62: @2[20]: _16 = &amp;_2
 25:64-25:77: @2[24]: _19 = &amp;_1
 25:80-25:93: @2[26]: _20 = &amp;_2
-25:64-25:93: @2.Call: _18 = &lt;Version as PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
+25:64-25:93: @2.Call: _18 = &lt;Version as std::cmp::PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
 25:64-25:93: @3[2]: _17 = &amp;_18
 25:5-25:95: @3[3]: _14 = (move _15, move _16, move _17)
 25:5-25:95: @3[7]: FakeRead(ForMatchedPlace, _14)
@@ -126,20 +126,20 @@ For revisions in Pull Requests (PR):
 25:5-25:95: @3[11]: _22 = (_14.1: &amp;Version)
 25:5-25:95: @3[13]: _23 = (_14.2: &amp;bool)
 25:5-25:95: @3[16]: _25 = &amp;(*_21)
-25:5-25:95: @3[18]: _26 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @3.Call: _24 = ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
+25:5-25:95: @3[18]: _26 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @3.Call: _24 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
 25:5-25:95: @4[4]: _28 = &amp;(*_22)
-25:5-25:95: @4[6]: _29 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @4.Call: _27 = ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
+25:5-25:95: @4[6]: _29 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @4.Call: _27 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
 25:5-25:95: @5[4]: _31 = &amp;(*_23)
 25:5-25:95: @5[6]: _32 = &lt;bool as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r bool, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @5.Call: _30 = ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
+25:5-25:95: @5.Call: _30 = std::fmt::ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
 25:5-25:95: @6[2]: _13 = [move _24, move _27, move _30]
 25:5-25:95: @6[9]: _12 = &amp;_13
 25:5-25:95: @6[10]: _11 = &amp;(*_12)
 25:5-25:95: @6[11]: _10 = move _11 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-25:5-25:95: @6.Call: _5 = Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
-25:5-25:95: @7.Call: _4 = _print(move _5) -&gt; [return: bb8, unwind: bb9]
+25:5-25:95: @6.Call: _5 = std::fmt::Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
+25:5-25:95: @7.Call: _4 = std::io::_print(move _5) -&gt; [return: bb8, unwind: bb9]
 25:5-25:95: @8[7]: _3 = const ()
 21:11-26:2: @8[9]: _0 = const ()
 26:2-26:2: @8.Return: return">    let version_3_2_1 = Version::new(3, 2, 1);</span></span>
@@ -155,7 +155,7 @@ For revisions in Pull Requests (PR):
 25:49-25:62: @2[20]: _16 = &amp;_2
 25:64-25:77: @2[24]: _19 = &amp;_1
 25:80-25:93: @2[26]: _20 = &amp;_2
-25:64-25:93: @2.Call: _18 = &lt;Version as PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
+25:64-25:93: @2.Call: _18 = &lt;Version as std::cmp::PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
 25:64-25:93: @3[2]: _17 = &amp;_18
 25:5-25:95: @3[3]: _14 = (move _15, move _16, move _17)
 25:5-25:95: @3[7]: FakeRead(ForMatchedPlace, _14)
@@ -163,20 +163,20 @@ For revisions in Pull Requests (PR):
 25:5-25:95: @3[11]: _22 = (_14.1: &amp;Version)
 25:5-25:95: @3[13]: _23 = (_14.2: &amp;bool)
 25:5-25:95: @3[16]: _25 = &amp;(*_21)
-25:5-25:95: @3[18]: _26 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @3.Call: _24 = ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
+25:5-25:95: @3[18]: _26 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @3.Call: _24 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
 25:5-25:95: @4[4]: _28 = &amp;(*_22)
-25:5-25:95: @4[6]: _29 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @4.Call: _27 = ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
+25:5-25:95: @4[6]: _29 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @4.Call: _27 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
 25:5-25:95: @5[4]: _31 = &amp;(*_23)
 25:5-25:95: @5[6]: _32 = &lt;bool as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r bool, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @5.Call: _30 = ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
+25:5-25:95: @5.Call: _30 = std::fmt::ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
 25:5-25:95: @6[2]: _13 = [move _24, move _27, move _30]
 25:5-25:95: @6[9]: _12 = &amp;_13
 25:5-25:95: @6[10]: _11 = &amp;(*_12)
 25:5-25:95: @6[11]: _10 = move _11 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-25:5-25:95: @6.Call: _5 = Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
-25:5-25:95: @7.Call: _4 = _print(move _5) -&gt; [return: bb8, unwind: bb9]
+25:5-25:95: @6.Call: _5 = std::fmt::Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
+25:5-25:95: @7.Call: _4 = std::io::_print(move _5) -&gt; [return: bb8, unwind: bb9]
 25:5-25:95: @8[7]: _3 = const ()
 21:11-26:2: @8[9]: _0 = const ()
 26:2-26:2: @8.Return: return">    let version_3_3_0 = Version::new(3, 3, 0);</span></span>
@@ -192,7 +192,7 @@ For revisions in Pull Requests (PR):
 25:49-25:62: @2[20]: _16 = &amp;_2
 25:64-25:77: @2[24]: _19 = &amp;_1
 25:80-25:93: @2[26]: _20 = &amp;_2
-25:64-25:93: @2.Call: _18 = &lt;Version as PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
+25:64-25:93: @2.Call: _18 = &lt;Version as std::cmp::PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
 25:64-25:93: @3[2]: _17 = &amp;_18
 25:5-25:95: @3[3]: _14 = (move _15, move _16, move _17)
 25:5-25:95: @3[7]: FakeRead(ForMatchedPlace, _14)
@@ -200,20 +200,20 @@ For revisions in Pull Requests (PR):
 25:5-25:95: @3[11]: _22 = (_14.1: &amp;Version)
 25:5-25:95: @3[13]: _23 = (_14.2: &amp;bool)
 25:5-25:95: @3[16]: _25 = &amp;(*_21)
-25:5-25:95: @3[18]: _26 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @3.Call: _24 = ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
+25:5-25:95: @3[18]: _26 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @3.Call: _24 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
 25:5-25:95: @4[4]: _28 = &amp;(*_22)
-25:5-25:95: @4[6]: _29 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @4.Call: _27 = ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
+25:5-25:95: @4[6]: _29 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @4.Call: _27 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
 25:5-25:95: @5[4]: _31 = &amp;(*_23)
 25:5-25:95: @5[6]: _32 = &lt;bool as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r bool, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @5.Call: _30 = ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
+25:5-25:95: @5.Call: _30 = std::fmt::ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
 25:5-25:95: @6[2]: _13 = [move _24, move _27, move _30]
 25:5-25:95: @6[9]: _12 = &amp;_13
 25:5-25:95: @6[10]: _11 = &amp;(*_12)
 25:5-25:95: @6[11]: _10 = move _11 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-25:5-25:95: @6.Call: _5 = Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
-25:5-25:95: @7.Call: _4 = _print(move _5) -&gt; [return: bb8, unwind: bb9]
+25:5-25:95: @6.Call: _5 = std::fmt::Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
+25:5-25:95: @7.Call: _4 = std::io::_print(move _5) -&gt; [return: bb8, unwind: bb9]
 25:5-25:95: @8[7]: _3 = const ()
 21:11-26:2: @8[9]: _0 = const ()
 26:2-26:2: @8.Return: return"></span></span>
@@ -229,7 +229,7 @@ For revisions in Pull Requests (PR):
 25:49-25:62: @2[20]: _16 = &amp;_2
 25:64-25:77: @2[24]: _19 = &amp;_1
 25:80-25:93: @2[26]: _20 = &amp;_2
-25:64-25:93: @2.Call: _18 = &lt;Version as PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
+25:64-25:93: @2.Call: _18 = &lt;Version as std::cmp::PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
 25:64-25:93: @3[2]: _17 = &amp;_18
 25:5-25:95: @3[3]: _14 = (move _15, move _16, move _17)
 25:5-25:95: @3[7]: FakeRead(ForMatchedPlace, _14)
@@ -237,20 +237,20 @@ For revisions in Pull Requests (PR):
 25:5-25:95: @3[11]: _22 = (_14.1: &amp;Version)
 25:5-25:95: @3[13]: _23 = (_14.2: &amp;bool)
 25:5-25:95: @3[16]: _25 = &amp;(*_21)
-25:5-25:95: @3[18]: _26 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @3.Call: _24 = ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
+25:5-25:95: @3[18]: _26 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @3.Call: _24 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
 25:5-25:95: @4[4]: _28 = &amp;(*_22)
-25:5-25:95: @4[6]: _29 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @4.Call: _27 = ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
+25:5-25:95: @4[6]: _29 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @4.Call: _27 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
 25:5-25:95: @5[4]: _31 = &amp;(*_23)
 25:5-25:95: @5[6]: _32 = &lt;bool as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r bool, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @5.Call: _30 = ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
+25:5-25:95: @5.Call: _30 = std::fmt::ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
 25:5-25:95: @6[2]: _13 = [move _24, move _27, move _30]
 25:5-25:95: @6[9]: _12 = &amp;_13
 25:5-25:95: @6[10]: _11 = &amp;(*_12)
 25:5-25:95: @6[11]: _10 = move _11 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-25:5-25:95: @6.Call: _5 = Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
-25:5-25:95: @7.Call: _4 = _print(move _5) -&gt; [return: bb8, unwind: bb9]
+25:5-25:95: @6.Call: _5 = std::fmt::Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
+25:5-25:95: @7.Call: _4 = std::io::_print(move _5) -&gt; [return: bb8, unwind: bb9]
 25:5-25:95: @8[7]: _3 = const ()
 21:11-26:2: @8[9]: _0 = const ()
 26:2-26:2: @8.Return: return">    println!("{:?} &lt; {:?} = {}", version_3_2_1, version_3_3_0, version_3_2_1 &lt; version_3_3_0);</span></span>
@@ -266,7 +266,7 @@ For revisions in Pull Requests (PR):
 25:49-25:62: @2[20]: _16 = &amp;_2
 25:64-25:77: @2[24]: _19 = &amp;_1
 25:80-25:93: @2[26]: _20 = &amp;_2
-25:64-25:93: @2.Call: _18 = &lt;Version as PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
+25:64-25:93: @2.Call: _18 = &lt;Version as std::cmp::PartialOrd&gt;::lt(move _19, move _20) -&gt; [return: bb3, unwind: bb9]
 25:64-25:93: @3[2]: _17 = &amp;_18
 25:5-25:95: @3[3]: _14 = (move _15, move _16, move _17)
 25:5-25:95: @3[7]: FakeRead(ForMatchedPlace, _14)
@@ -274,20 +274,20 @@ For revisions in Pull Requests (PR):
 25:5-25:95: @3[11]: _22 = (_14.1: &amp;Version)
 25:5-25:95: @3[13]: _23 = (_14.2: &amp;bool)
 25:5-25:95: @3[16]: _25 = &amp;(*_21)
-25:5-25:95: @3[18]: _26 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @3.Call: _24 = ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
+25:5-25:95: @3[18]: _26 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @3.Call: _24 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _25, move _26) -&gt; [return: bb4, unwind: bb9]
 25:5-25:95: @4[4]: _28 = &amp;(*_22)
-25:5-25:95: @4[6]: _29 = &lt;Version as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @4.Call: _27 = ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
+25:5-25:95: @4[6]: _29 = &lt;Version as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r Version, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+25:5-25:95: @4.Call: _27 = std::fmt::ArgumentV1::new::&lt;Version&gt;(move _28, move _29) -&gt; [return: bb5, unwind: bb9]
 25:5-25:95: @5[4]: _31 = &amp;(*_23)
 25:5-25:95: @5[6]: _32 = &lt;bool as std::fmt::Display&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r bool, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-25:5-25:95: @5.Call: _30 = ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
+25:5-25:95: @5.Call: _30 = std::fmt::ArgumentV1::new::&lt;bool&gt;(move _31, move _32) -&gt; [return: bb6, unwind: bb9]
 25:5-25:95: @6[2]: _13 = [move _24, move _27, move _30]
 25:5-25:95: @6[9]: _12 = &amp;_13
 25:5-25:95: @6[10]: _11 = &amp;(*_12)
 25:5-25:95: @6[11]: _10 = move _11 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-25:5-25:95: @6.Call: _5 = Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
-25:5-25:95: @7.Call: _4 = _print(move _5) -&gt; [return: bb8, unwind: bb9]
+25:5-25:95: @6.Call: _5 = std::fmt::Arguments::new_v1(move _6, move _10) -&gt; [return: bb7, unwind: bb9]
+25:5-25:95: @7.Call: _4 = std::io::_print(move _5) -&gt; [return: bb8, unwind: bb9]
 25:5-25:95: @8[7]: _3 = const ()
 21:11-26:2: @8[9]: _0 = const ()
 26:2-26:2: @8.Return: return">}<span class="annotation">⦉@0,1,2,3,4,5,6,7,8</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
index 47f9ab2bd5e..3954fc3d0bd 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 8:5-8:17: @0[4]: _3 = &amp;(*_4)
 8:5-8:17: @0[7]: _6 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 8:5-8:17: @0[8]: _5 = &amp;(*_6)
-8:5-8:17: @0.Call: _2 = &lt;usize as PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
-8:5-8:17: @1[3]: _7 = Less
-8:5-8:17: @1.Call: _0 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
+8:5-8:17: @0.Call: _2 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
+8:5-8:17: @1[3]: _7 = std::cmp::Ordering::Less
+8:5-8:17: @1.Call: _0 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
 8:5-8:17: @2.Return: return"><span class="annotation">@0,1,2⦊</span>patch: usize<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}.-------.InstrumentCoverage.0.html
index 9f0c29c50bf..86e18b3dbfd 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 7:5-7:17: @0[5]: _4 = &amp;(*_5)
 7:5-7:17: @0[8]: _7 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 7:5-7:17: @0[9]: _6 = &amp;(*_7)
-7:5-7:17: @0.Call: _3 = &lt;usize as PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
-7:5-7:17: @1[3]: _8 = Equal
-7:5-7:17: @1.Call: _2 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
+7:5-7:17: @0.Call: _3 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
+7:5-7:17: @1[3]: _8 = std::cmp::Ordering::Equal
+7:5-7:17: @1.Call: _2 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
 7:5-7:17: @2[4]: _10 = &amp;(*(_1.2: &amp;&amp;usize))
 7:5-7:17: @2[6]: _11 = &amp;(*(_1.3: &amp;&amp;usize))"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">minor: usize</span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge.-------.InstrumentCoverage.0.html
index 60a832b2e2a..652dc277081 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-ge.-------.InstrumentCoverage.0.html
@@ -81,9 +81,9 @@ For revisions in Pull Requests (PR):
 4:39-4:49: @0[21]: _13 = &amp;(*_14)
 4:39-4:49: @0[24]: _16 = &amp;(*_3)
 4:39-4:49: @0[25]: _15 = &amp;(*_16)
-4:39-4:49: @0.Call: _12 = &lt;usize as PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
-4:39-4:49: @1[3]: _17 = Equal
-4:39-4:49: @1.Call: _11 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
+4:39-4:49: @0.Call: _12 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
+4:39-4:49: @1[3]: _17 = std::cmp::Ordering::Equal
+4:39-4:49: @1.Call: _11 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
 4:39-4:49: @2[4]: _19 = &amp;_7
 4:39-4:49: @2[6]: _20 = &amp;_4
 4:39-4:49: @2[8]: _21 = &amp;_8
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
index 2b9a13fe060..57fc5d8d6de 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 8:5-8:17: @0[4]: _3 = &amp;(*_4)
 8:5-8:17: @0[7]: _6 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 8:5-8:17: @0[8]: _5 = &amp;(*_6)
-8:5-8:17: @0.Call: _2 = &lt;usize as PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
-8:5-8:17: @1[3]: _7 = Less
-8:5-8:17: @1.Call: _0 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
+8:5-8:17: @0.Call: _2 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
+8:5-8:17: @1[3]: _7 = std::cmp::Ordering::Less
+8:5-8:17: @1.Call: _0 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
 8:5-8:17: @2.Return: return"><span class="annotation">@0,1,2⦊</span>patch: usize<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}.-------.InstrumentCoverage.0.html
index ff7e783dd68..6fbcdff5ab7 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 7:5-7:17: @0[5]: _4 = &amp;(*_5)
 7:5-7:17: @0[8]: _7 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 7:5-7:17: @0[9]: _6 = &amp;(*_7)
-7:5-7:17: @0.Call: _3 = &lt;usize as PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
-7:5-7:17: @1[3]: _8 = Equal
-7:5-7:17: @1.Call: _2 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
+7:5-7:17: @0.Call: _3 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
+7:5-7:17: @1[3]: _8 = std::cmp::Ordering::Equal
+7:5-7:17: @1.Call: _2 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
 7:5-7:17: @2[4]: _10 = &amp;(*(_1.2: &amp;&amp;usize))
 7:5-7:17: @2[6]: _11 = &amp;(*(_1.3: &amp;&amp;usize))"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">minor: usize</span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt.-------.InstrumentCoverage.0.html
index f6b9dc9776f..37f2661cf18 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-gt.-------.InstrumentCoverage.0.html
@@ -81,9 +81,9 @@ For revisions in Pull Requests (PR):
 4:39-4:49: @0[21]: _13 = &amp;(*_14)
 4:39-4:49: @0[24]: _16 = &amp;(*_3)
 4:39-4:49: @0[25]: _15 = &amp;(*_16)
-4:39-4:49: @0.Call: _12 = &lt;usize as PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
-4:39-4:49: @1[3]: _17 = Equal
-4:39-4:49: @1.Call: _11 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
+4:39-4:49: @0.Call: _12 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
+4:39-4:49: @1[3]: _17 = std::cmp::Ordering::Equal
+4:39-4:49: @1.Call: _11 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
 4:39-4:49: @2[4]: _19 = &amp;_7
 4:39-4:49: @2[6]: _20 = &amp;_4
 4:39-4:49: @2[8]: _21 = &amp;_8
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
index 5c95a635f07..5789988c991 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 8:5-8:17: @0[4]: _3 = &amp;(*_4)
 8:5-8:17: @0[7]: _6 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 8:5-8:17: @0[8]: _5 = &amp;(*_6)
-8:5-8:17: @0.Call: _2 = &lt;usize as PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
-8:5-8:17: @1[3]: _7 = Greater
-8:5-8:17: @1.Call: _0 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
+8:5-8:17: @0.Call: _2 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
+8:5-8:17: @1[3]: _7 = std::cmp::Ordering::Greater
+8:5-8:17: @1.Call: _0 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
 8:5-8:17: @2.Return: return"><span class="annotation">@0,1,2⦊</span>patch: usize<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}.-------.InstrumentCoverage.0.html
index 6eb894a166a..de7c38bc9c4 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 7:5-7:17: @0[5]: _4 = &amp;(*_5)
 7:5-7:17: @0[8]: _7 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 7:5-7:17: @0[9]: _6 = &amp;(*_7)
-7:5-7:17: @0.Call: _3 = &lt;usize as PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
-7:5-7:17: @1[3]: _8 = Equal
-7:5-7:17: @1.Call: _2 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
+7:5-7:17: @0.Call: _3 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
+7:5-7:17: @1[3]: _8 = std::cmp::Ordering::Equal
+7:5-7:17: @1.Call: _2 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
 7:5-7:17: @2[4]: _10 = &amp;(*(_1.2: &amp;&amp;usize))
 7:5-7:17: @2[6]: _11 = &amp;(*(_1.3: &amp;&amp;usize))"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">minor: usize</span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le.-------.InstrumentCoverage.0.html
index fb7e520faf1..1f3068868f6 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-le.-------.InstrumentCoverage.0.html
@@ -81,9 +81,9 @@ For revisions in Pull Requests (PR):
 4:39-4:49: @0[21]: _13 = &amp;(*_14)
 4:39-4:49: @0[24]: _16 = &amp;(*_3)
 4:39-4:49: @0[25]: _15 = &amp;(*_16)
-4:39-4:49: @0.Call: _12 = &lt;usize as PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
-4:39-4:49: @1[3]: _17 = Equal
-4:39-4:49: @1.Call: _11 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
+4:39-4:49: @0.Call: _12 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
+4:39-4:49: @1[3]: _17 = std::cmp::Ordering::Equal
+4:39-4:49: @1.Call: _11 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
 4:39-4:49: @2[4]: _19 = &amp;_7
 4:39-4:49: @2[6]: _20 = &amp;_4
 4:39-4:49: @2[8]: _21 = &amp;_8
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
index b2b3e172d53..746daab5ac1 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 8:5-8:17: @0[4]: _3 = &amp;(*_4)
 8:5-8:17: @0[7]: _6 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 8:5-8:17: @0[8]: _5 = &amp;(*_6)
-8:5-8:17: @0.Call: _2 = &lt;usize as PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
-8:5-8:17: @1[3]: _7 = Greater
-8:5-8:17: @1.Call: _0 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
+8:5-8:17: @0.Call: _2 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _3, move _5) -&gt; [return: bb1, unwind: bb3]
+8:5-8:17: @1[3]: _7 = std::cmp::Ordering::Greater
+8:5-8:17: @1.Call: _0 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _2, move _7) -&gt; [return: bb2, unwind: bb3]
 8:5-8:17: @2.Return: return"><span class="annotation">@0,1,2⦊</span>patch: usize<span class="annotation">⦉@0,1,2</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}.-------.InstrumentCoverage.0.html
index e54849345b7..0867a7ad364 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt-{closure#0}.-------.InstrumentCoverage.0.html
@@ -74,9 +74,9 @@ For revisions in Pull Requests (PR):
 7:5-7:17: @0[5]: _4 = &amp;(*_5)
 7:5-7:17: @0[8]: _7 = &amp;(*(*(_1.1: &amp;&amp;usize)))
 7:5-7:17: @0[9]: _6 = &amp;(*_7)
-7:5-7:17: @0.Call: _3 = &lt;usize as PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
-7:5-7:17: @1[3]: _8 = Equal
-7:5-7:17: @1.Call: _2 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
+7:5-7:17: @0.Call: _3 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _4, move _6) -&gt; [return: bb1, unwind: bb4]
+7:5-7:17: @1[3]: _8 = std::cmp::Ordering::Equal
+7:5-7:17: @1.Call: _2 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _3, move _8) -&gt; [return: bb2, unwind: bb4]
 7:5-7:17: @2[4]: _10 = &amp;(*(_1.2: &amp;&amp;usize))
 7:5-7:17: @2[6]: _11 = &amp;(*(_1.3: &amp;&amp;usize))"><span class="annotation">@0,1,2,3⦊</span>‸<span class="annotation">⦉@0,1,2,3</span></span></span><span class="code" style="--layer: 0">minor: usize</span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt.-------.InstrumentCoverage.0.html
index f111ad0045a..abcd7147c6f 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#2}-lt.-------.InstrumentCoverage.0.html
@@ -81,9 +81,9 @@ For revisions in Pull Requests (PR):
 4:39-4:49: @0[21]: _13 = &amp;(*_14)
 4:39-4:49: @0[24]: _16 = &amp;(*_3)
 4:39-4:49: @0[25]: _15 = &amp;(*_16)
-4:39-4:49: @0.Call: _12 = &lt;usize as PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
-4:39-4:49: @1[3]: _17 = Equal
-4:39-4:49: @1.Call: _11 = Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
+4:39-4:49: @0.Call: _12 = &lt;usize as std::cmp::PartialOrd&gt;::partial_cmp(move _13, move _15) -&gt; [return: bb1, unwind: bb5]
+4:39-4:49: @1[3]: _17 = std::cmp::Ordering::Equal
+4:39-4:49: @1.Call: _11 = std::option::Option::&lt;std::cmp::Ordering&gt;::unwrap_or(move _12, move _17) -&gt; [return: bb2, unwind: bb5]
 4:39-4:49: @2[4]: _19 = &amp;_7
 4:39-4:49: @2[6]: _20 = &amp;_4
 4:39-4:49: @2[8]: _21 = &amp;_8
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#7}-fmt.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#7}-fmt.-------.InstrumentCoverage.0.html
index 94c77025ecf..5b9e070864b 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#7}-fmt.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#7}-fmt.-------.InstrumentCoverage.0.html
@@ -76,7 +76,7 @@ For revisions in Pull Requests (PR):
 4:17-4:22: @0[9]: _7 = &amp;mut (*_2)
 4:17-4:22: @0[12]: _9 = const &quot;Version&quot;
 4:17-4:22: @0[13]: _8 = &amp;(*_9)
-4:17-4:22: @0.Call: _6 = Formatter::debug_struct(move _7, move _8) -&gt; [return: bb1, unwind: bb6]
+4:17-4:22: @0.Call: _6 = std::fmt::Formatter::debug_struct(move _7, move _8) -&gt; [return: bb1, unwind: bb6]
 4:17-4:22: @1[2]: FakeRead(ForLet, _6)
 4:17-4:22: @1[7]: _12 = &amp;mut _6
 4:17-4:22: @1[8]: _11 = &amp;mut (*_12)
@@ -86,7 +86,7 @@ For revisions in Pull Requests (PR):
 4:17-4:22: @1[18]: _17 = &amp;_18
 4:17-4:22: @1[19]: _16 = &amp;(*_17)
 4:17-4:22: @1[20]: _15 = move _16 as &amp;dyn std::fmt::Debug (Pointer(Unsize))
-4:17-4:22: @1.Call: _10 = DebugStruct::field(move _11, move _13, move _15) -&gt; [return: bb2, unwind: bb6]
+4:17-4:22: @1.Call: _10 = std::fmt::DebugStruct::field(move _11, move _13, move _15) -&gt; [return: bb2, unwind: bb6]
 4:17-4:22: @2[11]: _21 = &amp;mut _6
 4:17-4:22: @2[12]: _20 = &amp;mut (*_21)
 4:17-4:22: @2[15]: _23 = const &quot;minor&quot;
@@ -95,7 +95,7 @@ For revisions in Pull Requests (PR):
 4:17-4:22: @2[22]: _26 = &amp;_27
 4:17-4:22: @2[23]: _25 = &amp;(*_26)
 4:17-4:22: @2[24]: _24 = move _25 as &amp;dyn std::fmt::Debug (Pointer(Unsize))
-4:17-4:22: @2.Call: _19 = DebugStruct::field(move _20, move _22, move _24) -&gt; [return: bb3, unwind: bb6]
+4:17-4:22: @2.Call: _19 = std::fmt::DebugStruct::field(move _20, move _22, move _24) -&gt; [return: bb3, unwind: bb6]
 4:17-4:22: @3[11]: _30 = &amp;mut _6
 4:17-4:22: @3[12]: _29 = &amp;mut (*_30)
 4:17-4:22: @3[15]: _32 = const &quot;patch&quot;
@@ -104,10 +104,10 @@ For revisions in Pull Requests (PR):
 4:17-4:22: @3[22]: _35 = &amp;_36
 4:17-4:22: @3[23]: _34 = &amp;(*_35)
 4:17-4:22: @3[24]: _33 = move _34 as &amp;dyn std::fmt::Debug (Pointer(Unsize))
-4:17-4:22: @3.Call: _28 = DebugStruct::field(move _29, move _31, move _33) -&gt; [return: bb4, unwind: bb6]
+4:17-4:22: @3.Call: _28 = std::fmt::DebugStruct::field(move _29, move _31, move _33) -&gt; [return: bb4, unwind: bb6]
 4:17-4:22: @4[10]: _38 = &amp;mut _6
 4:17-4:22: @4[11]: _37 = &amp;mut (*_38)
-4:17-4:22: @4.Call: _0 = DebugStruct::finish(move _37) -&gt; [return: bb5, unwind: bb6]
+4:17-4:22: @4.Call: _0 = std::fmt::DebugStruct::finish(move _37) -&gt; [return: bb5, unwind: bb6]
 4:22-4:22: @5.Return: return"><span class="annotation">@0,1,2,3,4,5⦊</span>Debug<span class="annotation">⦉@0,1,2,3,4,5</span></span></span></span></div>
 </body>
 </html>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#8}-clone.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#8}-clone.-------.InstrumentCoverage.0.html
index 27a2ab71827..f1c98393343 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#8}-clone.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.partial_eq/partial_eq.{impl#8}-clone.-------.InstrumentCoverage.0.html
@@ -75,13 +75,13 @@ For revisions in Pull Requests (PR):
 4:10-4:15: @0[6]: _4 = &amp;((*_1).2: usize)
 4:10-4:15: @0[10]: _7 = &amp;(*_2)
 4:10-4:15: @0[11]: _6 = &amp;(*_7)
-4:10-4:15: @0.Call: _5 = &lt;usize as Clone&gt;::clone(move _6) -&gt; [return: bb1, unwind: bb4]
+4:10-4:15: @0.Call: _5 = &lt;usize as std::clone::Clone&gt;::clone(move _6) -&gt; [return: bb1, unwind: bb4]
 4:10-4:15: @1[4]: _10 = &amp;(*_3)
 4:10-4:15: @1[5]: _9 = &amp;(*_10)
-4:10-4:15: @1.Call: _8 = &lt;usize as Clone&gt;::clone(move _9) -&gt; [return: bb2, unwind: bb4]
+4:10-4:15: @1.Call: _8 = &lt;usize as std::clone::Clone&gt;::clone(move _9) -&gt; [return: bb2, unwind: bb4]
 4:10-4:15: @2[4]: _13 = &amp;(*_4)
 4:10-4:15: @2[5]: _12 = &amp;(*_13)
-4:10-4:15: @2.Call: _11 = &lt;usize as Clone&gt;::clone(move _12) -&gt; [return: bb3, unwind: bb4]
+4:10-4:15: @2.Call: _11 = &lt;usize as std::clone::Clone&gt;::clone(move _12) -&gt; [return: bb3, unwind: bb4]
 4:10-4:15: @3[1]: _0 = Version { major: move _5, minor: move _8, patch: move _11 }
 4:15-4:15: @3.Return: return"><span class="annotation">@0,1,2,3⦊</span>Clone<span class="annotation">⦉@0,1,2,3</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_loop/simple_loop.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_loop/simple_loop.main.-------.InstrumentCoverage.0.html
index f528b698d44..6b911eea341 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_loop/simple_loop.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_loop/simple_loop.main.-------.InstrumentCoverage.0.html
@@ -69,81 +69,81 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1">    let mut countdown = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 12:9-12:16: @3[6]: _7 = _1">    if</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb13]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb13]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb12]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 0_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_match/simple_match.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_match/simple_match.main.-------.InstrumentCoverage.0.html
index 8e49e45b86e..a56692d9c2a 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_match/simple_match.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.simple_match/simple_match.main.-------.InstrumentCoverage.0.html
@@ -69,65 +69,65 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<div class="code" style="counter-reset: line 2"><span class="line"><span><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1"><span class="annotation">@0,1,2,3⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1">    // dependent conditions.</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1"></span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
 9:9-9:22: @3[3]: FakeRead(ForLet, _5)
 10:8-10:15: @3[6]: _7 = _1">    let mut countdown = 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb21]
+<span class="line"><span class="code even" style="--layer: 1" title="7:19-7:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb21]
 7:19-7:35: @1[0]: _3 = &amp;_4
-7:19-7:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
+7:19-7:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb20]
 7:19-7:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 7:9-7:16: @2[3]: FakeRead(ForLet, _1)
 9:25-9:26: @3[2]: _5 = const 1_i32
@@ -147,7 +147,7 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">    in</span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code even" style="--layer: 1" title="17:9-17:13: @9[5]: _16 = &amp;mut _10
 17:9-17:13: @9[6]: _15 = &amp;mut (*_16)
-17:9-17:13: @9.Call: _14 = &lt;std::ops::Range&lt;i32&gt; as Iterator&gt;::next(move _15) -&gt; [return: bb10, unwind: bb21]
+17:9-17:13: @9.Call: _14 = &lt;std::ops::Range&lt;i32&gt; as std::iter::Iterator&gt;::next(move _15) -&gt; [return: bb10, unwind: bb21]
 17:9-17:13: @10[1]: FakeRead(ForMatchedPlace, _14)"><span class="annotation">@8,9,10⦊</span>0..2<span class="annotation">⦉@8,9,10</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    {</span></span>
 <span class="line"><span class="code" style="--layer: 0">        let z</span></span>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.try_error_result/try_error_result.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.try_error_result/try_error_result.main.-------.InstrumentCoverage.0.html
index 41404759c3d..5b0c5cb072f 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.try_error_result/try_error_result.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.try_error_result/try_error_result.main.-------.InstrumentCoverage.0.html
@@ -84,7 +84,7 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">    in</span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code even" style="--layer: 1" title="19:9-19:14: @3[5]: _11 = &amp;mut _5
 19:9-19:14: @3[6]: _10 = &amp;mut (*_11)
-19:9-19:14: @3.Call: _9 = &lt;std::ops::Range&lt;i32&gt; as Iterator&gt;::next(move _10) -&gt; [return: bb4, unwind: bb39]
+19:9-19:14: @3.Call: _9 = &lt;std::ops::Range&lt;i32&gt; as std::iter::Iterator&gt;::next(move _10) -&gt; [return: bb4, unwind: bb39]
 19:9-19:14: @4[1]: FakeRead(ForMatchedPlace, _9)"><span class="annotation">@2,3,4⦊</span>0..10<span class="annotation">⦉@2,3,4</span></span></span><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    {</span></span>
 <span class="line"><span class="code" style="--layer: 0">        </span><span><span class="code odd" style="--layer: 1" title="21:9-22:17: @8[12]: _17 = CheckedSub(_1, const 1_i32)
@@ -110,16 +110,16 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">        {</span></span>
 <span class="line"><span class="code" style="--layer: 0">            </span><span><span class="code even" style="--layer: 1" title="27:13-27:41: @10.Call: _22 = call(const true) -&gt; [return: bb12, unwind: bb39]"><span class="annotation">@10,12,13⦊</span>call(/*return_error=*/ true)<span class="annotation">⦉@10,12,13</span></span></span><span><span class="code odd" style="--layer: 1" title="27:41-27:42: @17[1]: _24 = ((_21 as Err).0: ())
 27:41-27:42: @17[4]: _27 = _24
-27:41-27:42: @17.Call: _26 = &lt;() as From&lt;()&gt;&gt;::from(move _27) -&gt; [return: bb18, unwind: bb39]"><span class="annotation">@15,17,18,19⦊</span>?<span class="annotation">⦉@15,17,18,19</span></span></span><span class="code" style="--layer: 0">;</span></span>
+27:41-27:42: @17.Call: _26 = &lt;() as std::convert::From&lt;()&gt;&gt;::from(move _27) -&gt; [return: bb18, unwind: bb39]"><span class="annotation">@15,17,18,19⦊</span>?<span class="annotation">⦉@15,17,18,19</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">            </span><span><span class="code even" style="--layer: 1" title="28:13-28:42: @14.Call: _31 = call(const false) -&gt; [return: bb20, unwind: bb39]"><span class="annotation">@14,20,21⦊</span>call(/*return_error=*/ false)<span class="annotation">⦉@14,20,21</span></span></span><span><span class="code odd" style="--layer: 1" title="28:42-28:43: @25[1]: _33 = ((_30 as Err).0: ())
 28:42-28:43: @25[4]: _36 = _33
-28:42-28:43: @25.Call: _35 = &lt;() as From&lt;()&gt;&gt;::from(move _36) -&gt; [return: bb26, unwind: bb39]"><span class="annotation">@23,25,26,27⦊</span>?<span class="annotation">⦉@23,25,26,27</span></span></span><span class="code" style="--layer: 0">;</span></span>
+28:42-28:43: @25.Call: _35 = &lt;() as std::convert::From&lt;()&gt;&gt;::from(move _36) -&gt; [return: bb26, unwind: bb39]"><span class="annotation">@23,25,26,27⦊</span>?<span class="annotation">⦉@23,25,26,27</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">        }</span></span>
 <span class="line"><span class="code" style="--layer: 0">        else</span></span>
 <span class="line"><span class="code" style="--layer: 0">        {</span></span>
 <span class="line"><span class="code" style="--layer: 0">            </span><span><span class="code even" style="--layer: 1" title="32:13-32:42: @11.Call: _40 = call(const false) -&gt; [return: bb28, unwind: bb39]"><span class="annotation">@11,28,29⦊</span>call(/*return_error=*/ false)<span class="annotation">⦉@11,28,29</span></span></span><span><span class="code odd" style="--layer: 1" title="32:42-32:43: @33[1]: _42 = ((_39 as Err).0: ())
 32:42-32:43: @33[4]: _45 = _42
-32:42-32:43: @33.Call: _44 = &lt;() as From&lt;()&gt;&gt;::from(move _45) -&gt; [return: bb34, unwind: bb39]"><span class="annotation">@31,33,34,35⦊</span>?<span class="annotation">⦉@31,33,34,35</span></span></span><span class="code" style="--layer: 0">;</span></span>
+32:42-32:43: @33.Call: _44 = &lt;() as std::convert::From&lt;()&gt;&gt;::from(move _45) -&gt; [return: bb34, unwind: bb39]"><span class="annotation">@31,33,34,35⦊</span>?<span class="annotation">⦉@31,33,34,35</span></span></span><span class="code" style="--layer: 0">;</span></span>
 <span class="line"><span class="code" style="--layer: 0">        }</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span></span>
 <span class="line"><span class="code" style="--layer: 0">    </span><span><span class="code even" style="--layer: 1" title="35:8-35:10: @5[9]: _47 = ()
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_function.-------.InstrumentCoverage.0.html
index 4af7b179866..65e21ecef13 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_function.-------.InstrumentCoverage.0.html
@@ -69,36 +69,36 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 36"><span class="line"><span><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<div class="code" style="counter-reset: line 36"><span class="line"><span><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 38:19-38:35: @1[0]: _3 = &amp;_4
-38:19-38:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+38:19-38:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 38:19-38:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 38:9-38:16: @2[3]: FakeRead(ForLet, _1)
 39:25-39:26: @3[2]: _5 = const 2_i32
 39:9-39:22: @3[3]: FakeRead(ForLet, _5)
 40:9-40:16: @3[6]: _7 = _1
 40:8-40:16: @3[7]: _6 = Not(move _7)"><span class="annotation">@0,1,2,3⦊</span>pub fn unused_function() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 38:19-38:35: @1[0]: _3 = &amp;_4
-38:19-38:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+38:19-38:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 38:19-38:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 38:9-38:16: @2[3]: FakeRead(ForLet, _1)
 39:25-39:26: @3[2]: _5 = const 2_i32
 39:9-39:22: @3[3]: FakeRead(ForLet, _5)
 40:9-40:16: @3[6]: _7 = _1
 40:8-40:16: @3[7]: _6 = Not(move _7)">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 38:19-38:35: @1[0]: _3 = &amp;_4
-38:19-38:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+38:19-38:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 38:19-38:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 38:9-38:16: @2[3]: FakeRead(ForLet, _1)
 39:25-39:26: @3[2]: _5 = const 2_i32
 39:9-39:22: @3[3]: FakeRead(ForLet, _5)
 40:9-40:16: @3[6]: _7 = _1
 40:8-40:16: @3[7]: _6 = Not(move _7)">    let mut countdown = 2;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="38:19-38:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 38:19-38:35: @1[0]: _3 = &amp;_4
-38:19-38:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+38:19-38:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 38:19-38:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 38:9-38:16: @2[3]: FakeRead(ForLet, _1)
 39:25-39:26: @3[2]: _5 = const 2_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_generic_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_generic_function.-------.InstrumentCoverage.0.html
index 6b0ce85c460..02154a2268b 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_generic_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_generic_function.-------.InstrumentCoverage.0.html
@@ -78,14 +78,14 @@ For revisions in Pull Requests (PR):
 34:5-34:56: @0[20]: FakeRead(ForMatchedPlace, _13)
 34:5-34:56: @0[22]: _15 = (_13.0: &amp;T)
 34:5-34:56: @0[25]: _17 = &amp;(*_15)
-34:5-34:56: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-34:5-34:56: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+34:5-34:56: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+34:5-34:56: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 34:5-34:56: @1[2]: _12 = [move _16]
 34:5-34:56: @1[5]: _11 = &amp;_12
 34:5-34:56: @1[6]: _10 = &amp;(*_11)
 34:5-34:56: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-34:5-34:56: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-34:5-34:56: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+34:5-34:56: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+34:5-34:56: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 34:5-34:56: @3[6]: _2 = const ()
 33:50-35:2: @3[8]: _0 = const ()
 35:2-35:2: @4.Return: return"><span class="annotation">@0,1,2,3,4⦊</span>pub fn unused_generic_function&lt;T: Debug&gt;(arg: T) {</span></span>
@@ -98,14 +98,14 @@ For revisions in Pull Requests (PR):
 34:5-34:56: @0[20]: FakeRead(ForMatchedPlace, _13)
 34:5-34:56: @0[22]: _15 = (_13.0: &amp;T)
 34:5-34:56: @0[25]: _17 = &amp;(*_15)
-34:5-34:56: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-34:5-34:56: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+34:5-34:56: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+34:5-34:56: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 34:5-34:56: @1[2]: _12 = [move _16]
 34:5-34:56: @1[5]: _11 = &amp;_12
 34:5-34:56: @1[6]: _10 = &amp;(*_11)
 34:5-34:56: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-34:5-34:56: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-34:5-34:56: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+34:5-34:56: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+34:5-34:56: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 34:5-34:56: @3[6]: _2 = const ()
 33:50-35:2: @3[8]: _0 = const ()
 35:2-35:2: @4.Return: return">    println!("unused_generic_function with {:?}", arg);</span></span>
@@ -118,14 +118,14 @@ For revisions in Pull Requests (PR):
 34:5-34:56: @0[20]: FakeRead(ForMatchedPlace, _13)
 34:5-34:56: @0[22]: _15 = (_13.0: &amp;T)
 34:5-34:56: @0[25]: _17 = &amp;(*_15)
-34:5-34:56: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-34:5-34:56: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+34:5-34:56: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+34:5-34:56: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 34:5-34:56: @1[2]: _12 = [move _16]
 34:5-34:56: @1[5]: _11 = &amp;_12
 34:5-34:56: @1[6]: _10 = &amp;(*_11)
 34:5-34:56: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-34:5-34:56: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-34:5-34:56: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+34:5-34:56: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+34:5-34:56: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 34:5-34:56: @3[6]: _2 = const ()
 33:50-35:2: @3[8]: _0 = const ()
 35:2-35:2: @4.Return: return">}<span class="annotation">⦉@0,1,2,3,4</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_private_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_private_function.-------.InstrumentCoverage.0.html
index 6424e03fc71..78228594e37 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_private_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.unused_private_function.-------.InstrumentCoverage.0.html
@@ -69,36 +69,36 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 44"><span class="line"><span><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<div class="code" style="counter-reset: line 44"><span class="line"><span><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 46:19-46:35: @1[0]: _3 = &amp;_4
-46:19-46:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+46:19-46:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 46:19-46:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 46:9-46:16: @2[3]: FakeRead(ForLet, _1)
 47:25-47:26: @3[2]: _5 = const 2_i32
 47:9-47:22: @3[3]: FakeRead(ForLet, _5)
 48:9-48:16: @3[6]: _7 = _1
 48:8-48:16: @3[7]: _6 = Not(move _7)"><span class="annotation">@0,1,2,3⦊</span>fn unused_private_function() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 46:19-46:35: @1[0]: _3 = &amp;_4
-46:19-46:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+46:19-46:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 46:19-46:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 46:9-46:16: @2[3]: FakeRead(ForLet, _1)
 47:25-47:26: @3[2]: _5 = const 2_i32
 47:9-47:22: @3[3]: FakeRead(ForLet, _5)
 48:9-48:16: @3[6]: _7 = _1
 48:8-48:16: @3[7]: _6 = Not(move _7)">    let is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 46:19-46:35: @1[0]: _3 = &amp;_4
-46:19-46:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+46:19-46:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 46:19-46:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 46:9-46:16: @2[3]: FakeRead(ForLet, _1)
 47:25-47:26: @3[2]: _5 = const 2_i32
 47:9-47:22: @3[3]: FakeRead(ForLet, _5)
 48:9-48:16: @3[6]: _7 = _1
 48:8-48:16: @3[7]: _6 = Not(move _7)">    let mut countdown = 2;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb8]
+<span class="line"><span class="code even" style="--layer: 1" title="46:19-46:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb8]
 46:19-46:35: @1[0]: _3 = &amp;_4
-46:19-46:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
+46:19-46:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb7]
 46:19-46:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 46:9-46:16: @2[3]: FakeRead(ForLet, _1)
 47:25-47:26: @3[2]: _5 = const 2_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.use_this_lib_crate.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.use_this_lib_crate.-------.InstrumentCoverage.0.html
index bed5e7bb7ce..8f618d2e249 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.use_this_lib_crate.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.use_this_lib_crate.-------.InstrumentCoverage.0.html
@@ -75,10 +75,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return"><span class="annotation">@0,1,2,3,4,5,6,7,8⦊</span>fn use_this_lib_crate() {</span></span>
@@ -88,10 +88,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">    used_from_bin_crate_and_lib_crate_generic_function("used from library used_crate.rs");</span></span>
@@ -101,10 +101,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">    used_with_same_type_from_bin_crate_and_lib_crate_generic_function(</span></span>
@@ -114,10 +114,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">        "used from library used_crate.rs",</span></span>
@@ -127,10 +127,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">    );</span></span>
@@ -140,10 +140,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">    let some_vec = vec![5, 6, 7, 8];</span></span>
@@ -153,10 +153,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">    used_only_from_this_lib_crate_generic_function(some_vec);</span></span>
@@ -166,10 +166,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">    used_only_from_this_lib_crate_generic_function("used ONLY from library used_crate.rs");</span></span>
@@ -179,10 +179,10 @@ For revisions in Pull Requests (PR):
 58:20-58:36: @2[6]: (*_6) = [const 5_i32, const 6_i32, const 7_i32, const 8_i32]
 58:20-58:36: @2[7]: _5 = move _6
 58:20-58:36: @2[8]: _4 = move _5 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-58:20-58:36: @4.Call: _3 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
+58:20-58:36: @4.Call: _3 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _4) -&gt; [return: bb5, unwind: bb12]
 58:9-58:17: @5[1]: FakeRead(ForLet, _3)
 59:52-59:60: @5[4]: _8 = move _3
-59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
+59:5-59:61: @5.Call: _7 = used_only_from_this_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _8) -&gt; [return: bb6, unwind: bb9]
 60:5-60:91: @6.Call: _9 = used_only_from_this_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;used ONLY from library used_crate.rs&quot;) -&gt; [return: bb7, unwind: bb10]
 53:25-61:2: @7[1]: _0 = const ()
 61:2-61:2: @8.Return: return">}<span class="annotation">⦉@0,1,2,3,4,5,6,7,8</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html
index 8b994a6962b..61a709c4729 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html
@@ -78,14 +78,14 @@ For revisions in Pull Requests (PR):
 26:5-26:83: @0[20]: FakeRead(ForMatchedPlace, _13)
 26:5-26:83: @0[22]: _15 = (_13.0: &amp;T)
 26:5-26:83: @0[25]: _17 = &amp;(*_15)
-26:5-26:83: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-26:5-26:83: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+26:5-26:83: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+26:5-26:83: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 26:5-26:83: @1[2]: _12 = [move _16]
 26:5-26:83: @1[5]: _11 = &amp;_12
 26:5-26:83: @1[6]: _10 = &amp;(*_11)
 26:5-26:83: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-26:5-26:83: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-26:5-26:83: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+26:5-26:83: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+26:5-26:83: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 26:5-26:83: @3[6]: _2 = const ()
 25:77-27:2: @3[8]: _0 = const ()
 27:2-27:2: @4.Return: return"><span class="annotation">@0,1,2,3,4⦊</span>pub fn used_from_bin_crate_and_lib_crate_generic_function&lt;T: Debug&gt;(arg: T) {</span></span>
@@ -98,14 +98,14 @@ For revisions in Pull Requests (PR):
 26:5-26:83: @0[20]: FakeRead(ForMatchedPlace, _13)
 26:5-26:83: @0[22]: _15 = (_13.0: &amp;T)
 26:5-26:83: @0[25]: _17 = &amp;(*_15)
-26:5-26:83: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-26:5-26:83: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+26:5-26:83: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+26:5-26:83: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 26:5-26:83: @1[2]: _12 = [move _16]
 26:5-26:83: @1[5]: _11 = &amp;_12
 26:5-26:83: @1[6]: _10 = &amp;(*_11)
 26:5-26:83: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-26:5-26:83: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-26:5-26:83: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+26:5-26:83: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+26:5-26:83: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 26:5-26:83: @3[6]: _2 = const ()
 25:77-27:2: @3[8]: _0 = const ()
 27:2-27:2: @4.Return: return">    println!("used_from_bin_crate_and_lib_crate_generic_function with {:?}", arg);</span></span>
@@ -118,14 +118,14 @@ For revisions in Pull Requests (PR):
 26:5-26:83: @0[20]: FakeRead(ForMatchedPlace, _13)
 26:5-26:83: @0[22]: _15 = (_13.0: &amp;T)
 26:5-26:83: @0[25]: _17 = &amp;(*_15)
-26:5-26:83: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-26:5-26:83: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+26:5-26:83: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+26:5-26:83: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 26:5-26:83: @1[2]: _12 = [move _16]
 26:5-26:83: @1[5]: _11 = &amp;_12
 26:5-26:83: @1[6]: _10 = &amp;(*_11)
 26:5-26:83: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-26:5-26:83: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-26:5-26:83: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+26:5-26:83: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+26:5-26:83: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 26:5-26:83: @3[6]: _2 = const ()
 25:77-27:2: @3[8]: _0 = const ()
 27:2-27:2: @4.Return: return">}<span class="annotation">⦉@0,1,2,3,4</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_function.-------.InstrumentCoverage.0.html
index d35f191b64e..974a24b2c6d 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_function.-------.InstrumentCoverage.0.html
@@ -73,25 +73,25 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">    // Initialize test constants in a way that cannot be determined at compile time, to ensure</span></span>
 <span class="line"><span class="code" style="--layer: 0">    // rustc and LLVM cannot optimize out statements (or coverage counters) downstream from</span></span>
 <span class="line"><span class="code" style="--layer: 0">    // dependent conditions.</span></span>
-<span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code even" style="--layer: 1" title="9:19-9:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb9]
+<span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code even" style="--layer: 1" title="9:19-9:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb9]
 9:19-9:35: @1[0]: _3 = &amp;_4
-9:19-9:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb8]
+9:19-9:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb8]
 9:19-9:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 9:9-9:16: @2[3]: FakeRead(ForLet, _1)
 10:25-10:26: @3[2]: _5 = const 0_i32
 10:9-10:22: @3[3]: FakeRead(ForLet, _5)
 11:8-11:15: @3[6]: _7 = _1"><span class="annotation">@0,1,2,3⦊</span>is_true = std::env::args().len() == 1;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="9:19-9:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb9]
+<span class="line"><span class="code even" style="--layer: 1" title="9:19-9:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb9]
 9:19-9:35: @1[0]: _3 = &amp;_4
-9:19-9:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb8]
+9:19-9:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb8]
 9:19-9:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 9:9-9:16: @2[3]: FakeRead(ForLet, _1)
 10:25-10:26: @3[2]: _5 = const 0_i32
 10:9-10:22: @3[3]: FakeRead(ForLet, _5)
 11:8-11:15: @3[6]: _7 = _1">    let mut countdown = 0;</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="9:19-9:35: @0.Call: _4 = args() -&gt; [return: bb1, unwind: bb9]
+<span class="line"><span class="code even" style="--layer: 1" title="9:19-9:35: @0.Call: _4 = std::env::args() -&gt; [return: bb1, unwind: bb9]
 9:19-9:35: @1[0]: _3 = &amp;_4
-9:19-9:41: @1.Call: _2 = &lt;Args as ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb8]
+9:19-9:41: @1.Call: _2 = &lt;std::env::Args as std::iter::ExactSizeIterator&gt;::len(move _3) -&gt; [return: bb2, unwind: bb8]
 9:19-9:46: @2[1]: _1 = Eq(move _2, const 1_usize)
 9:9-9:16: @2[3]: FakeRead(ForLet, _1)
 10:25-10:26: @3[2]: _5 = const 0_i32
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_bin_crate_generic_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_bin_crate_generic_function.-------.InstrumentCoverage.0.html
index 29fe03382c7..68035339fe4 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_bin_crate_generic_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_bin_crate_generic_function.-------.InstrumentCoverage.0.html
@@ -78,14 +78,14 @@ For revisions in Pull Requests (PR):
 18:5-18:74: @0[20]: FakeRead(ForMatchedPlace, _13)
 18:5-18:74: @0[22]: _15 = (_13.0: &amp;T)
 18:5-18:74: @0[25]: _17 = &amp;(*_15)
-18:5-18:74: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-18:5-18:74: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+18:5-18:74: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+18:5-18:74: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 18:5-18:74: @1[2]: _12 = [move _16]
 18:5-18:74: @1[5]: _11 = &amp;_12
 18:5-18:74: @1[6]: _10 = &amp;(*_11)
 18:5-18:74: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-18:5-18:74: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-18:5-18:74: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+18:5-18:74: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+18:5-18:74: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 18:5-18:74: @3[6]: _2 = const ()
 17:68-19:2: @3[8]: _0 = const ()
 19:2-19:2: @4.Return: return"><span class="annotation">@0,1,2,3,4⦊</span>pub fn used_only_from_bin_crate_generic_function&lt;T: Debug&gt;(arg: T) {</span></span>
@@ -98,14 +98,14 @@ For revisions in Pull Requests (PR):
 18:5-18:74: @0[20]: FakeRead(ForMatchedPlace, _13)
 18:5-18:74: @0[22]: _15 = (_13.0: &amp;T)
 18:5-18:74: @0[25]: _17 = &amp;(*_15)
-18:5-18:74: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-18:5-18:74: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+18:5-18:74: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+18:5-18:74: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 18:5-18:74: @1[2]: _12 = [move _16]
 18:5-18:74: @1[5]: _11 = &amp;_12
 18:5-18:74: @1[6]: _10 = &amp;(*_11)
 18:5-18:74: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-18:5-18:74: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-18:5-18:74: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+18:5-18:74: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+18:5-18:74: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 18:5-18:74: @3[6]: _2 = const ()
 17:68-19:2: @3[8]: _0 = const ()
 19:2-19:2: @4.Return: return">    println!("used_only_from_bin_crate_generic_function with {:?}", arg);</span></span>
@@ -118,14 +118,14 @@ For revisions in Pull Requests (PR):
 18:5-18:74: @0[20]: FakeRead(ForMatchedPlace, _13)
 18:5-18:74: @0[22]: _15 = (_13.0: &amp;T)
 18:5-18:74: @0[25]: _17 = &amp;(*_15)
-18:5-18:74: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-18:5-18:74: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+18:5-18:74: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+18:5-18:74: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 18:5-18:74: @1[2]: _12 = [move _16]
 18:5-18:74: @1[5]: _11 = &amp;_12
 18:5-18:74: @1[6]: _10 = &amp;(*_11)
 18:5-18:74: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-18:5-18:74: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-18:5-18:74: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+18:5-18:74: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+18:5-18:74: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 18:5-18:74: @3[6]: _2 = const ()
 17:68-19:2: @3[8]: _0 = const ()
 19:2-19:2: @4.Return: return">}<span class="annotation">⦉@0,1,2,3,4</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_this_lib_crate_generic_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_this_lib_crate_generic_function.-------.InstrumentCoverage.0.html
index 76bc057dd00..63944eb9ab3 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_this_lib_crate_generic_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_only_from_this_lib_crate_generic_function.-------.InstrumentCoverage.0.html
@@ -78,14 +78,14 @@ For revisions in Pull Requests (PR):
 22:5-22:79: @0[20]: FakeRead(ForMatchedPlace, _13)
 22:5-22:79: @0[22]: _15 = (_13.0: &amp;T)
 22:5-22:79: @0[25]: _17 = &amp;(*_15)
-22:5-22:79: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-22:5-22:79: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+22:5-22:79: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+22:5-22:79: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 22:5-22:79: @1[2]: _12 = [move _16]
 22:5-22:79: @1[5]: _11 = &amp;_12
 22:5-22:79: @1[6]: _10 = &amp;(*_11)
 22:5-22:79: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-22:5-22:79: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-22:5-22:79: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+22:5-22:79: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+22:5-22:79: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 22:5-22:79: @3[6]: _2 = const ()
 21:73-23:2: @3[8]: _0 = const ()
 23:2-23:2: @4.Return: return"><span class="annotation">@0,1,2,3,4⦊</span>pub fn used_only_from_this_lib_crate_generic_function&lt;T: Debug&gt;(arg: T) {</span></span>
@@ -98,14 +98,14 @@ For revisions in Pull Requests (PR):
 22:5-22:79: @0[20]: FakeRead(ForMatchedPlace, _13)
 22:5-22:79: @0[22]: _15 = (_13.0: &amp;T)
 22:5-22:79: @0[25]: _17 = &amp;(*_15)
-22:5-22:79: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-22:5-22:79: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+22:5-22:79: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+22:5-22:79: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 22:5-22:79: @1[2]: _12 = [move _16]
 22:5-22:79: @1[5]: _11 = &amp;_12
 22:5-22:79: @1[6]: _10 = &amp;(*_11)
 22:5-22:79: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-22:5-22:79: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-22:5-22:79: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+22:5-22:79: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+22:5-22:79: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 22:5-22:79: @3[6]: _2 = const ()
 21:73-23:2: @3[8]: _0 = const ()
 23:2-23:2: @4.Return: return">    println!("used_only_from_this_lib_crate_generic_function with {:?}", arg);</span></span>
@@ -118,14 +118,14 @@ For revisions in Pull Requests (PR):
 22:5-22:79: @0[20]: FakeRead(ForMatchedPlace, _13)
 22:5-22:79: @0[22]: _15 = (_13.0: &amp;T)
 22:5-22:79: @0[25]: _17 = &amp;(*_15)
-22:5-22:79: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-22:5-22:79: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+22:5-22:79: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+22:5-22:79: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 22:5-22:79: @1[2]: _12 = [move _16]
 22:5-22:79: @1[5]: _11 = &amp;_12
 22:5-22:79: @1[6]: _10 = &amp;(*_11)
 22:5-22:79: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-22:5-22:79: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-22:5-22:79: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+22:5-22:79: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+22:5-22:79: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 22:5-22:79: @3[6]: _2 = const ()
 21:73-23:2: @3[8]: _0 = const ()
 23:2-23:2: @4.Return: return">}<span class="annotation">⦉@0,1,2,3,4</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_with_same_type_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_with_same_type_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html
index a2f4b7e19eb..b146180fbd1 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_with_same_type_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.used_crate/used_crate.used_with_same_type_from_bin_crate_and_lib_crate_generic_function.-------.InstrumentCoverage.0.html
@@ -78,14 +78,14 @@ For revisions in Pull Requests (PR):
 30:5-30:98: @0[20]: FakeRead(ForMatchedPlace, _13)
 30:5-30:98: @0[22]: _15 = (_13.0: &amp;T)
 30:5-30:98: @0[25]: _17 = &amp;(*_15)
-30:5-30:98: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-30:5-30:98: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+30:5-30:98: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+30:5-30:98: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 30:5-30:98: @1[2]: _12 = [move _16]
 30:5-30:98: @1[5]: _11 = &amp;_12
 30:5-30:98: @1[6]: _10 = &amp;(*_11)
 30:5-30:98: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-30:5-30:98: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-30:5-30:98: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+30:5-30:98: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+30:5-30:98: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 30:5-30:98: @3[6]: _2 = const ()
 29:92-31:2: @3[8]: _0 = const ()
 31:2-31:2: @4.Return: return"><span class="annotation">@0,1,2,3,4⦊</span>pub fn used_with_same_type_from_bin_crate_and_lib_crate_generic_function&lt;T: Debug&gt;(arg: T) {</span></span>
@@ -98,14 +98,14 @@ For revisions in Pull Requests (PR):
 30:5-30:98: @0[20]: FakeRead(ForMatchedPlace, _13)
 30:5-30:98: @0[22]: _15 = (_13.0: &amp;T)
 30:5-30:98: @0[25]: _17 = &amp;(*_15)
-30:5-30:98: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-30:5-30:98: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+30:5-30:98: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+30:5-30:98: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 30:5-30:98: @1[2]: _12 = [move _16]
 30:5-30:98: @1[5]: _11 = &amp;_12
 30:5-30:98: @1[6]: _10 = &amp;(*_11)
 30:5-30:98: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-30:5-30:98: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-30:5-30:98: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+30:5-30:98: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+30:5-30:98: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 30:5-30:98: @3[6]: _2 = const ()
 29:92-31:2: @3[8]: _0 = const ()
 31:2-31:2: @4.Return: return">    println!("used_with_same_type_from_bin_crate_and_lib_crate_generic_function with {:?}", arg);</span></span>
@@ -118,14 +118,14 @@ For revisions in Pull Requests (PR):
 30:5-30:98: @0[20]: FakeRead(ForMatchedPlace, _13)
 30:5-30:98: @0[22]: _15 = (_13.0: &amp;T)
 30:5-30:98: @0[25]: _17 = &amp;(*_15)
-30:5-30:98: @0[27]: _18 = &lt;T as Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
-30:5-30:98: @0.Call: _16 = ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
+30:5-30:98: @0[27]: _18 = &lt;T as std::fmt::Debug&gt;::fmt as for&lt;&#39;r, &#39;s, &#39;t0&gt; fn(&amp;&#39;r T, &amp;&#39;s mut std::fmt::Formatter&lt;&#39;t0&gt;) -&gt; std::result::Result&lt;(), std::fmt::Error&gt; (Pointer(ReifyFnPointer))
+30:5-30:98: @0.Call: _16 = std::fmt::ArgumentV1::new::&lt;T&gt;(move _17, move _18) -&gt; [return: bb1, unwind: bb5]
 30:5-30:98: @1[2]: _12 = [move _16]
 30:5-30:98: @1[5]: _11 = &amp;_12
 30:5-30:98: @1[6]: _10 = &amp;(*_11)
 30:5-30:98: @1[7]: _9 = move _10 as &amp;[std::fmt::ArgumentV1] (Pointer(Unsize))
-30:5-30:98: @1.Call: _4 = Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
-30:5-30:98: @2.Call: _3 = _print(move _4) -&gt; [return: bb3, unwind: bb5]
+30:5-30:98: @1.Call: _4 = std::fmt::Arguments::new_v1(move _5, move _9) -&gt; [return: bb2, unwind: bb5]
+30:5-30:98: @2.Call: _3 = std::io::_print(move _4) -&gt; [return: bb3, unwind: bb5]
 30:5-30:98: @3[6]: _2 = const ()
 29:92-31:2: @3[8]: _0 = const ()
 31:2-31:2: @4.Return: return">}<span class="annotation">⦉@0,1,2,3,4</span></span></span></span></div>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.uses_crate/uses_crate.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.uses_crate/uses_crate.main.-------.InstrumentCoverage.0.html
index acb2c7d63f5..28cf051ecf8 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.uses_crate/uses_crate.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.uses_crate/uses_crate.main.-------.InstrumentCoverage.0.html
@@ -69,124 +69,124 @@ For revisions in Pull Requests (PR):
 </style>
 </head>
 <body>
-<div class="code" style="counter-reset: line 4"><span class="line"><span><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<div class="code" style="counter-reset: line 4"><span class="line"><span><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return"><span class="annotation">@0,1,2,3,4,5,6,7,8,9⦊</span>fn main() {</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return">    used_crate::used_function();</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return">    let some_vec = vec![1, 2, 3, 4];</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return">    used_crate::used_only_from_bin_crate_generic_function(&amp;some_vec);</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return">    used_crate::used_only_from_bin_crate_generic_function("used from bin uses_crate.rs");</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return">    used_crate::used_from_bin_crate_and_lib_crate_generic_function(some_vec);</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return">    used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function("interesting?");</span></span>
-<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_function() -&gt; [return: bb1, unwind: bb14]
+<span class="line"><span class="code even" style="--layer: 1" title="6:5-6:32: @0.Call: _1 = used_crate::used_function() -&gt; [return: bb1, unwind: bb14]
 7:20-7:36: @1[5]: _5 = Box([i32; 4])
 7:20-7:36: @1[6]: (*_5) = [const 1_i32, const 2_i32, const 3_i32, const 4_i32]
 7:20-7:36: @1[7]: _4 = move _5
 7:20-7:36: @1[8]: _3 = move _4 as std::boxed::Box&lt;[i32]&gt; (Pointer(Unsize))
-7:20-7:36: @3.Call: _2 = slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
+7:20-7:36: @3.Call: _2 = std::slice::&lt;impl [i32]&gt;::into_vec::&lt;std::alloc::Global&gt;(move _3) -&gt; [return: bb4, unwind: bb13]
 7:9-7:17: @4[1]: FakeRead(ForLet, _2)
 8:59-8:68: @4[4]: _7 = &amp;_2
-8:5-8:69: @4.Call: _6 = used_only_from_bin_crate_generic_function::&lt;&amp;Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
-9:5-9:89: @5.Call: _8 = used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
+8:5-8:69: @4.Call: _6 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;std::vec::Vec&lt;i32&gt;&gt;(move _7) -&gt; [return: bb5, unwind: bb11]
+9:5-9:89: @5.Call: _8 = used_crate::used_only_from_bin_crate_generic_function::&lt;&amp;str&gt;(const &quot;used from bin uses_crate.rs&quot;) -&gt; [return: bb6, unwind: bb11]
 10:68-10:76: @6[3]: _10 = move _2
-10:5-10:77: @6.Call: _9 = used_from_bin_crate_and_lib_crate_generic_function::&lt;Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
-11:5-11:98: @7.Call: _11 = used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
+10:5-10:77: @6.Call: _9 = used_crate::used_from_bin_crate_and_lib_crate_generic_function::&lt;std::vec::Vec&lt;i32&gt;&gt;(move _10) -&gt; [return: bb7, unwind: bb10]
+11:5-11:98: @7.Call: _11 = used_crate::used_with_same_type_from_bin_crate_and_lib_crate_generic_function::&lt;&amp;str&gt;(const &quot;interesting?&quot;) -&gt; [return: bb8, unwind: bb11]
 5:11-12:2: @8[1]: _0 = const ()
 12:2-12:2: @9.Return: return">}<span class="annotation">⦉@0,1,2,3,4,5,6,7,8,9</span></span></span></span></div>
 </body>
diff --git a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.yield/yield.main.-------.InstrumentCoverage.0.html b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.yield/yield.main.-------.InstrumentCoverage.0.html
index 99e56393ea5..4c0c0d562b8 100644
--- a/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.yield/yield.main.-------.InstrumentCoverage.0.html
+++ b/src/test/run-make-fulldeps/coverage-spanview/expected_mir_dump.yield/yield.main.-------.InstrumentCoverage.0.html
@@ -76,26 +76,26 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">    };</span></span>
 <span class="line"><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    match </span><span><span class="code even" style="--layer: 1" title="13:20-13:34: @0[7]: _5 = &amp;mut _1
-13:11-13:35: @0.Call: _4 = Pin::&lt;&amp;mut [generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}]&gt;::new(move _5) -&gt; [return: bb1, unwind: bb26]
+13:11-13:35: @0.Call: _4 = std::pin::Pin::&lt;&amp;mut [generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}]&gt;::new(move _5) -&gt; [return: bb1, unwind: bb26]
 13:43-13:45: @1[2]: _6 = ()
-13:11-13:46: @1.Call: _3 = &lt;[generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}] as Generator&gt;::resume(move _4, move _6) -&gt; [return: bb2, unwind: bb26]
+13:11-13:46: @1.Call: _3 = &lt;[generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}] as std::ops::Generator&gt;::resume(move _4, move _6) -&gt; [return: bb2, unwind: bb26]
 13:11-13:46: @2[2]: FakeRead(ForMatchedPlace, _3)
 14:9-14:35: @2[3]: _7 = discriminant(_3)"><span class="annotation">@0,1,2⦊</span>Pin::new(&amp;mut generator).resume(()) {</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="13:20-13:34: @0[7]: _5 = &amp;mut _1
-13:11-13:35: @0.Call: _4 = Pin::&lt;&amp;mut [generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}]&gt;::new(move _5) -&gt; [return: bb1, unwind: bb26]
+13:11-13:35: @0.Call: _4 = std::pin::Pin::&lt;&amp;mut [generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}]&gt;::new(move _5) -&gt; [return: bb1, unwind: bb26]
 13:43-13:45: @1[2]: _6 = ()
-13:11-13:46: @1.Call: _3 = &lt;[generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}] as Generator&gt;::resume(move _4, move _6) -&gt; [return: bb2, unwind: bb26]
+13:11-13:46: @1.Call: _3 = &lt;[generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}] as std::ops::Generator&gt;::resume(move _4, move _6) -&gt; [return: bb2, unwind: bb26]
 13:11-13:46: @2[2]: FakeRead(ForMatchedPlace, _3)
 14:9-14:35: @2[3]: _7 = discriminant(_3)">        GeneratorState::Yielded(1)<span class="annotation">⦉@0,1,2</span></span></span><span class="code" style="--layer: 0"> =&gt; </span><span><span class="code odd" style="--layer: 1" title="14:39-14:41: @6[0]: _2 = const ()"><span class="annotation">@4,6,7,8⦊</span>{}<span class="annotation">⦉@4,6,7,8</span></span></span><span class="code" style="--layer: 0"></span></span>
-<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code even" style="--layer: 1" title="15:14-15:52: @5.Call: begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@5⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@5</span></span></span><span class="code" style="--layer: 0">,</span></span>
+<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code even" style="--layer: 1" title="15:14-15:52: @5.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@5⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@5</span></span></span><span class="code" style="--layer: 0">,</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span></span>
 <span class="line"><span class="code" style="--layer: 0">    match </span><span><span class="code odd" style="--layer: 1" title="17:20-17:34: @6[7]: _12 = &amp;mut _1
-17:11-17:35: @6.Call: _11 = Pin::&lt;&amp;mut [generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}]&gt;::new(move _12) -&gt; [return: bb7, unwind: bb26]
+17:11-17:35: @6.Call: _11 = std::pin::Pin::&lt;&amp;mut [generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}]&gt;::new(move _12) -&gt; [return: bb7, unwind: bb26]
 17:43-17:45: @7[2]: _13 = ()
-17:11-17:46: @7.Call: _10 = &lt;[generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}] as Generator&gt;::resume(move _11, move _13) -&gt; [return: bb8, unwind: bb26]
+17:11-17:46: @7.Call: _10 = &lt;[generator@../coverage/yield.rs:8:25: 11:6 {i32, ()}] as std::ops::Generator&gt;::resume(move _11, move _13) -&gt; [return: bb8, unwind: bb26]
 17:11-17:46: @8[2]: FakeRead(ForMatchedPlace, _10)"><span class="annotation">@4,6,7,8⦊</span>Pin::new(&amp;mut generator).resume(())<span class="annotation">⦉@4,6,7,8</span></span></span><span class="code" style="--layer: 0"> {</span></span>
-<span class="line"><span class="code" style="--layer: 0">        GeneratorState::Complete(</span><span><span class="code even" style="--layer: 1" title="18:34-18:39: @10.Call: _14 = &lt;str as PartialEq&gt;::eq(((_10 as Complete).0: &amp;str), const &quot;foo&quot;) -&gt; [return: bb11, unwind: bb26]"><span class="annotation">@10,11⦊</span>"foo"<span class="annotation">⦉@10,11</span></span></span><span class="code" style="--layer: 0">) =&gt; </span><span><span class="code odd" style="--layer: 1" title="18:44-18:46: @13[0]: _9 = const ()"><span class="annotation">@12,13,14,15⦊</span>{}<span class="annotation">⦉@12,13,14,15</span></span></span><span class="code" style="--layer: 0"></span></span>
-<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code even" style="--layer: 1" title="19:14-19:52: @9.Call: begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@9⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@9</span></span></span><span class="code" style="--layer: 0">,</span></span>
+<span class="line"><span class="code" style="--layer: 0">        GeneratorState::Complete(</span><span><span class="code even" style="--layer: 1" title="18:34-18:39: @10.Call: _14 = &lt;str as std::cmp::PartialEq&gt;::eq(((_10 as Complete).0: &amp;str), const &quot;foo&quot;) -&gt; [return: bb11, unwind: bb26]"><span class="annotation">@10,11⦊</span>"foo"<span class="annotation">⦉@10,11</span></span></span><span class="code" style="--layer: 0">) =&gt; </span><span><span class="code odd" style="--layer: 1" title="18:44-18:46: @13[0]: _9 = const ()"><span class="annotation">@12,13,14,15⦊</span>{}<span class="annotation">⦉@12,13,14,15</span></span></span><span class="code" style="--layer: 0"></span></span>
+<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code even" style="--layer: 1" title="19:14-19:52: @9.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@9⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@9</span></span></span><span class="code" style="--layer: 0">,</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span></span>
 <span class="line"><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    let </span><span><span class="code odd" style="--layer: 1" title="22:9-22:22: @13[5]: FakeRead(ForLet, _17)"><span class="annotation">@12,13,14,15⦊</span>mut generator<span class="annotation">⦉@12,13,14,15</span></span></span><span class="code" style="--layer: 0"> = || {</span></span>
@@ -106,32 +106,32 @@ For revisions in Pull Requests (PR):
 <span class="line"><span class="code" style="--layer: 0">    };</span></span>
 <span class="line"><span class="code" style="--layer: 0"></span></span>
 <span class="line"><span class="code" style="--layer: 0">    match </span><span><span class="code odd" style="--layer: 1" title="29:20-29:34: @13[10]: _21 = &amp;mut _17
-29:11-29:35: @13.Call: _20 = Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _21) -&gt; [return: bb14, unwind: bb26]
+29:11-29:35: @13.Call: _20 = std::pin::Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _21) -&gt; [return: bb14, unwind: bb26]
 29:43-29:45: @14[2]: _22 = ()
-29:11-29:46: @14.Call: _19 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as Generator&gt;::resume(move _20, move _22) -&gt; [return: bb15, unwind: bb26]
+29:11-29:46: @14.Call: _19 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as std::ops::Generator&gt;::resume(move _20, move _22) -&gt; [return: bb15, unwind: bb26]
 29:11-29:46: @15[2]: FakeRead(ForMatchedPlace, _19)
 30:9-30:35: @15[3]: _23 = discriminant(_19)"><span class="annotation">@12,13,14,15⦊</span>Pin::new(&amp;mut generator).resume(()) {</span></span>
 <span class="line"><span class="code odd" style="--layer: 1" title="29:20-29:34: @13[10]: _21 = &amp;mut _17
-29:11-29:35: @13.Call: _20 = Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _21) -&gt; [return: bb14, unwind: bb26]
+29:11-29:35: @13.Call: _20 = std::pin::Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _21) -&gt; [return: bb14, unwind: bb26]
 29:43-29:45: @14[2]: _22 = ()
-29:11-29:46: @14.Call: _19 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as Generator&gt;::resume(move _20, move _22) -&gt; [return: bb15, unwind: bb26]
+29:11-29:46: @14.Call: _19 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as std::ops::Generator&gt;::resume(move _20, move _22) -&gt; [return: bb15, unwind: bb26]
 29:11-29:46: @15[2]: FakeRead(ForMatchedPlace, _19)
 30:9-30:35: @15[3]: _23 = discriminant(_19)">        GeneratorState::Yielded(1)<span class="annotation">⦉@12,13,14,15</span></span></span><span class="code" style="--layer: 0"> =&gt; </span><span><span class="code even" style="--layer: 1" title="30:39-30:41: @19[0]: _18 = const ()"><span class="annotation">@17,19,20,21⦊</span>{}<span class="annotation">⦉@17,19,20,21</span></span></span><span class="code" style="--layer: 0"></span></span>
-<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code odd" style="--layer: 1" title="31:14-31:52: @18.Call: begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@18⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@18</span></span></span><span class="code" style="--layer: 0">,</span></span>
+<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code odd" style="--layer: 1" title="31:14-31:52: @18.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@18⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@18</span></span></span><span class="code" style="--layer: 0">,</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span></span>
 <span class="line"><span class="code" style="--layer: 0">    match </span><span><span class="code even" style="--layer: 1" title="33:20-33:34: @19[6]: _27 = &amp;mut _17
-33:11-33:35: @19.Call: _26 = Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _27) -&gt; [return: bb20, unwind: bb26]
+33:11-33:35: @19.Call: _26 = std::pin::Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _27) -&gt; [return: bb20, unwind: bb26]
 33:43-33:45: @20[2]: _28 = ()
-33:11-33:46: @20.Call: _25 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as Generator&gt;::resume(move _26, move _28) -&gt; [return: bb21, unwind: bb26]
+33:11-33:46: @20.Call: _25 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as std::ops::Generator&gt;::resume(move _26, move _28) -&gt; [return: bb21, unwind: bb26]
 33:11-33:46: @21[2]: FakeRead(ForMatchedPlace, _25)
 34:9-34:35: @21[3]: _29 = discriminant(_25)"><span class="annotation">@17,19,20,21⦊</span>Pin::new(&amp;mut generator).resume(()) {</span></span>
 <span class="line"><span class="code even" style="--layer: 1" title="33:20-33:34: @19[6]: _27 = &amp;mut _17
-33:11-33:35: @19.Call: _26 = Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _27) -&gt; [return: bb20, unwind: bb26]
+33:11-33:35: @19.Call: _26 = std::pin::Pin::&lt;&amp;mut [generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}]&gt;::new(move _27) -&gt; [return: bb20, unwind: bb26]
 33:43-33:45: @20[2]: _28 = ()
-33:11-33:46: @20.Call: _25 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as Generator&gt;::resume(move _26, move _28) -&gt; [return: bb21, unwind: bb26]
+33:11-33:46: @20.Call: _25 = &lt;[generator@../coverage/yield.rs:22:25: 27:6 {i32, ()}] as std::ops::Generator&gt;::resume(move _26, move _28) -&gt; [return: bb21, unwind: bb26]
 33:11-33:46: @21[2]: FakeRead(ForMatchedPlace, _25)
 34:9-34:35: @21[3]: _29 = discriminant(_25)">        GeneratorState::Yielded(2)<span class="annotation">⦉@17,19,20,21</span></span></span><span class="code" style="--layer: 0"> =&gt; </span><span><span class="code odd" style="--layer: 1" title="34:39-34:41: @25[0]: _0 = const ()"><span class="annotation">@23,25⦊</span>{}<span class="annotation">⦉@23,25</span></span></span><span class="code" style="--layer: 0"></span></span>
-<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code even" style="--layer: 1" title="35:14-35:52: @24.Call: begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@24⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@24</span></span></span><span class="code" style="--layer: 0">,</span></span>
+<span class="line"><span class="code" style="--layer: 0">        _ =&gt; </span><span><span class="code even" style="--layer: 1" title="35:14-35:52: @24.Call: std::rt::begin_panic::&lt;&amp;str&gt;(const &quot;unexpected value from resume&quot;) -&gt; bb26"><span class="annotation">@24⦊</span>panic!("unexpected value from resume")<span class="annotation">⦉@24</span></span></span><span class="code" style="--layer: 0">,</span></span>
 <span class="line"><span class="code" style="--layer: 0">    }</span></span>
 <span class="line"><span class="code" style="--layer: 0">}</span><span><span class="code odd" style="--layer: 1" title="37:2-37:2: @25.Return: return"><span class="annotation">@23,25⦊</span>‸<span class="annotation">⦉@23,25</span></span></span></span></div>
 </body>
diff --git a/src/test/ui/async-await/async-block-control-flow-static-semantics.stderr b/src/test/ui/async-await/async-block-control-flow-static-semantics.stderr
index dbdfb2e71e0..919904ce3b6 100644
--- a/src/test/ui/async-await/async-block-control-flow-static-semantics.stderr
+++ b/src/test/ui/async-await/async-block-control-flow-static-semantics.stderr
@@ -59,22 +59,22 @@ error[E0308]: mismatched types
   --> $DIR/async-block-control-flow-static-semantics.rs:47:44
    |
 LL | fn rethrow_targets_async_block_not_fn() -> Result<u8, MyErr> {
-   |    ----------------------------------      ^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `()`
+   |    ----------------------------------      ^^^^^^^^^^^^^^^^^ expected enum `Result`, found `()`
    |    |
    |    implicitly returns `()` as its body has no tail or `return` expression
    |
-   = note:   expected enum `std::result::Result<u8, MyErr>`
+   = note:   expected enum `Result<u8, MyErr>`
            found unit type `()`
 
 error[E0308]: mismatched types
   --> $DIR/async-block-control-flow-static-semantics.rs:56:50
    |
 LL | fn rethrow_targets_async_block_not_async_fn() -> Result<u8, MyErr> {
-   |    ----------------------------------------      ^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `()`
+   |    ----------------------------------------      ^^^^^^^^^^^^^^^^^ expected enum `Result`, found `()`
    |    |
    |    implicitly returns `()` as its body has no tail or `return` expression
    |
-   = note:   expected enum `std::result::Result<u8, MyErr>`
+   = note:   expected enum `Result<u8, MyErr>`
            found unit type `()`
 
 error: aborting due to 8 previous errors
diff --git a/src/test/ui/async-await/issues/issue-67893.stderr b/src/test/ui/async-await/issues/issue-67893.stderr
index af09f0a27bf..aee2ae0e2e4 100644
--- a/src/test/ui/async-await/issues/issue-67893.stderr
+++ b/src/test/ui/async-await/issues/issue-67893.stderr
@@ -13,9 +13,9 @@ LL | pub async fn run() {
    |                    - within this `impl Future`
    |
    = help: within `impl Future`, the trait `Send` is not implemented for `MutexGuard<'_, ()>`
-   = note: required because it appears within the type `for<'r, 's, 't0, 't1, 't2, 't3> {ResumeTy, Arc<Mutex<()>>, &'r Mutex<()>, std::result::Result<MutexGuard<'s, ()>, PoisonError<MutexGuard<'t0, ()>>>, &'t1 MutexGuard<'t2, ()>, MutexGuard<'t3, ()>, (), impl Future}`
-   = note: required because it appears within the type `[static generator@run::{closure#0} for<'r, 's, 't0, 't1, 't2, 't3> {ResumeTy, Arc<Mutex<()>>, &'r Mutex<()>, std::result::Result<MutexGuard<'s, ()>, PoisonError<MutexGuard<'t0, ()>>>, &'t1 MutexGuard<'t2, ()>, MutexGuard<'t3, ()>, (), impl Future}]`
-   = note: required because it appears within the type `from_generator::GenFuture<[static generator@run::{closure#0} for<'r, 's, 't0, 't1, 't2, 't3> {ResumeTy, Arc<Mutex<()>>, &'r Mutex<()>, std::result::Result<MutexGuard<'s, ()>, PoisonError<MutexGuard<'t0, ()>>>, &'t1 MutexGuard<'t2, ()>, MutexGuard<'t3, ()>, (), impl Future}]>`
+   = note: required because it appears within the type `for<'r, 's, 't0, 't1, 't2, 't3> {ResumeTy, Arc<Mutex<()>>, &'r Mutex<()>, Result<MutexGuard<'s, ()>, PoisonError<MutexGuard<'t0, ()>>>, &'t1 MutexGuard<'t2, ()>, MutexGuard<'t3, ()>, (), impl Future}`
+   = note: required because it appears within the type `[static generator@run::{closure#0} for<'r, 's, 't0, 't1, 't2, 't3> {ResumeTy, Arc<Mutex<()>>, &'r Mutex<()>, Result<MutexGuard<'s, ()>, PoisonError<MutexGuard<'t0, ()>>>, &'t1 MutexGuard<'t2, ()>, MutexGuard<'t3, ()>, (), impl Future}]`
+   = note: required because it appears within the type `from_generator::GenFuture<[static generator@run::{closure#0} for<'r, 's, 't0, 't1, 't2, 't3> {ResumeTy, Arc<Mutex<()>>, &'r Mutex<()>, Result<MutexGuard<'s, ()>, PoisonError<MutexGuard<'t0, ()>>>, &'t1 MutexGuard<'t2, ()>, MutexGuard<'t3, ()>, (), impl Future}]>`
    = note: required because it appears within the type `impl Future`
    = note: required because it appears within the type `impl Future`
 
diff --git a/src/test/ui/coercion/coercion-missing-tail-expected-type.stderr b/src/test/ui/coercion/coercion-missing-tail-expected-type.stderr
index da8db4331df..df1fb58e25a 100644
--- a/src/test/ui/coercion/coercion-missing-tail-expected-type.stderr
+++ b/src/test/ui/coercion/coercion-missing-tail-expected-type.stderr
@@ -12,13 +12,13 @@ error[E0308]: mismatched types
   --> $DIR/coercion-missing-tail-expected-type.rs:8:13
    |
 LL | fn foo() -> Result<u8, u64> {
-   |    ---      ^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `()`
+   |    ---      ^^^^^^^^^^^^^^^ expected enum `Result`, found `()`
    |    |
    |    implicitly returns `()` as its body has no tail or `return` expression
 LL |     Ok(1);
    |          - help: consider removing this semicolon
    |
-   = note:   expected enum `std::result::Result<u8, u64>`
+   = note:   expected enum `Result<u8, u64>`
            found unit type `()`
 
 error: aborting due to 2 previous errors
diff --git a/src/test/ui/feature-gates/feature-gate-exhaustive-patterns.stderr b/src/test/ui/feature-gates/feature-gate-exhaustive-patterns.stderr
index 05547595234..e079c2ddcee 100644
--- a/src/test/ui/feature-gates/feature-gate-exhaustive-patterns.stderr
+++ b/src/test/ui/feature-gates/feature-gate-exhaustive-patterns.stderr
@@ -11,7 +11,7 @@ LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
    |
    = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
    = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
-   = note: the matched value is of type `std::result::Result<u32, !>`
+   = note: the matched value is of type `Result<u32, !>`
 help: you might want to use `if let` to ignore the variant that isn't matched
    |
 LL |     if let Ok(_x) = foo() { /* */ }
diff --git a/src/test/ui/generator/type-mismatch-signature-deduction.stderr b/src/test/ui/generator/type-mismatch-signature-deduction.stderr
index 4abc0542c51..30e23ea8f65 100644
--- a/src/test/ui/generator/type-mismatch-signature-deduction.stderr
+++ b/src/test/ui/generator/type-mismatch-signature-deduction.stderr
@@ -2,11 +2,11 @@ error[E0308]: mismatched types
   --> $DIR/type-mismatch-signature-deduction.rs:13:9
    |
 LL |         5
-   |         ^ expected enum `std::result::Result`, found integer
+   |         ^ expected enum `Result`, found integer
    |
-   = note: expected type `std::result::Result<{integer}, _>`
+   = note: expected type `Result<{integer}, _>`
               found type `{integer}`
-note: return type inferred to be `std::result::Result<{integer}, _>` here
+note: return type inferred to be `Result<{integer}, _>` here
   --> $DIR/type-mismatch-signature-deduction.rs:8:20
    |
 LL |             return Ok(6);
@@ -16,9 +16,9 @@ error[E0271]: type mismatch resolving `<[generator@$DIR/type-mismatch-signature-
   --> $DIR/type-mismatch-signature-deduction.rs:5:13
    |
 LL | fn foo() -> impl Generator<Return = i32> {
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `i32`
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `Result`, found `i32`
    |
-   = note: expected enum `std::result::Result<{integer}, _>`
+   = note: expected enum `Result<{integer}, _>`
               found type `i32`
 
 error: aborting due to 2 previous errors
diff --git a/src/test/ui/generics/wrong-number-of-args.rs b/src/test/ui/generics/wrong-number-of-args.rs
index 6b99865202e..2994ca3c759 100644
--- a/src/test/ui/generics/wrong-number-of-args.rs
+++ b/src/test/ui/generics/wrong-number-of-args.rs
@@ -139,7 +139,7 @@ mod stdlib {
 
     mod result {
         type A = Result;
-        //~^ ERROR missing generics for enum `std::result::Result`
+        //~^ ERROR missing generics for enum `Result`
         //~| HELP use angle brackets
 
         type B = Result<String>;
diff --git a/src/test/ui/generics/wrong-number-of-args.stderr b/src/test/ui/generics/wrong-number-of-args.stderr
index 2a34fba2c48..73bd76aa5fa 100644
--- a/src/test/ui/generics/wrong-number-of-args.stderr
+++ b/src/test/ui/generics/wrong-number-of-args.stderr
@@ -365,7 +365,7 @@ note: struct defined here, with at most 3 type parameters: `K`, `V`, `S`
 LL | pub struct HashMap<K, V, S = RandomState> {
    |            ^^^^^^^ -  -  -
 
-error[E0107]: missing generics for enum `std::result::Result`
+error[E0107]: missing generics for enum `Result`
   --> $DIR/wrong-number-of-args.rs:141:18
    |
 LL |         type A = Result;
diff --git a/src/test/ui/impl-trait/trait_type.stderr b/src/test/ui/impl-trait/trait_type.stderr
index e94f2c70215..961bb735118 100644
--- a/src/test/ui/impl-trait/trait_type.stderr
+++ b/src/test/ui/impl-trait/trait_type.stderr
@@ -4,7 +4,7 @@ error[E0053]: method `fmt` has an incompatible type for trait
 LL |    fn fmt(&self, x: &str) -> () { }
    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ types differ in mutability
    |
-   = note: expected fn pointer `fn(&MyType, &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error>`
+   = note: expected fn pointer `fn(&MyType, &mut Formatter<'_>) -> Result<(), std::fmt::Error>`
               found fn pointer `fn(&MyType, &str)`
 
 error[E0050]: method `fmt` has 1 parameter but the declaration in trait `std::fmt::Display::fmt` has 2
@@ -13,7 +13,7 @@ error[E0050]: method `fmt` has 1 parameter but the declaration in trait `std::fm
 LL |    fn fmt(&self) -> () { }
    |           ^^^^^ expected 2 parameters, found 1
    |
-   = note: `fmt` from trait: `fn(&Self, &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error>`
+   = note: `fmt` from trait: `fn(&Self, &mut Formatter<'_>) -> Result<(), std::fmt::Error>`
 
 error[E0186]: method `fmt` has a `&self` declaration in the trait, but not in the impl
   --> $DIR/trait_type.rs:17:4
@@ -21,7 +21,7 @@ error[E0186]: method `fmt` has a `&self` declaration in the trait, but not in th
 LL |    fn fmt() -> () { }
    |    ^^^^^^^^^^^^^^ expected `&self` in impl
    |
-   = note: `fmt` from trait: `fn(&Self, &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error>`
+   = note: `fmt` from trait: `fn(&Self, &mut Formatter<'_>) -> Result<(), std::fmt::Error>`
 
 error[E0046]: not all trait items implemented, missing: `fmt`
   --> $DIR/trait_type.rs:21:1
@@ -29,7 +29,7 @@ error[E0046]: not all trait items implemented, missing: `fmt`
 LL | impl std::fmt::Display for MyType4 {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `fmt` in implementation
    |
-   = help: implement the missing item: `fn fmt(&self, _: &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error> { todo!() }`
+   = help: implement the missing item: `fn fmt(&self, _: &mut Formatter<'_>) -> Result<(), std::fmt::Error> { todo!() }`
 
 error: aborting due to 4 previous errors
 
diff --git a/src/test/ui/inference/cannot-infer-closure-circular.stderr b/src/test/ui/inference/cannot-infer-closure-circular.stderr
index 5efb400a4c7..211ae13e46d 100644
--- a/src/test/ui/inference/cannot-infer-closure-circular.stderr
+++ b/src/test/ui/inference/cannot-infer-closure-circular.stderr
@@ -1,8 +1,8 @@
-error[E0282]: type annotations needed for `std::result::Result<(), E>`
+error[E0282]: type annotations needed for `Result<(), E>`
   --> $DIR/cannot-infer-closure-circular.rs:7:14
    |
 LL |     let x = |r| {
-   |              ^ consider giving this closure parameter the explicit type `std::result::Result<(), E>`, with the type parameters specified
+   |              ^ consider giving this closure parameter the explicit type `Result<(), E>`, with the type parameters specified
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/inference/cannot-infer-closure.stderr b/src/test/ui/inference/cannot-infer-closure.stderr
index 475ed00d107..0dcce9e990b 100644
--- a/src/test/ui/inference/cannot-infer-closure.stderr
+++ b/src/test/ui/inference/cannot-infer-closure.stderr
@@ -1,4 +1,4 @@
-error[E0282]: type annotations needed for the closure `fn((), ()) -> std::result::Result<(), _>`
+error[E0282]: type annotations needed for the closure `fn((), ()) -> Result<(), _>`
   --> $DIR/cannot-infer-closure.rs:3:15
    |
 LL |         Err(a)?;
@@ -7,8 +7,8 @@ LL |         Err(a)?;
    = note: `?` implicitly converts the error value into a type implementing `From<()>`
 help: give this closure an explicit return type without `_` placeholders
    |
-LL |     let x = |a: (), b: ()| -> std::result::Result<(), _> {
-   |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     let x = |a: (), b: ()| -> Result<(), _> {
+   |                            ^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/inference/cannot-infer-partial-try-return.stderr b/src/test/ui/inference/cannot-infer-partial-try-return.stderr
index a64503fa667..86e2126e1ae 100644
--- a/src/test/ui/inference/cannot-infer-partial-try-return.stderr
+++ b/src/test/ui/inference/cannot-infer-partial-try-return.stderr
@@ -1,4 +1,4 @@
-error[E0282]: type annotations needed for the closure `fn() -> std::result::Result<(), QualifiedError<_>>`
+error[E0282]: type annotations needed for the closure `fn() -> Result<(), QualifiedError<_>>`
   --> $DIR/cannot-infer-partial-try-return.rs:19:9
    |
 LL |         infallible()?;
@@ -7,8 +7,8 @@ LL |         infallible()?;
    = note: `?` implicitly converts the error value into `QualifiedError<_>` using its implementation of `From<Infallible>`
 help: give this closure an explicit return type without `_` placeholders
    |
-LL |     let x = || -> std::result::Result<(), QualifiedError<_>> {
-   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL |     let x = || -> Result<(), QualifiedError<_>> {
+   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/inference/issue-72616.stderr b/src/test/ui/inference/issue-72616.stderr
index d811988c9c1..3c9d864c426 100644
--- a/src/test/ui/inference/issue-72616.stderr
+++ b/src/test/ui/inference/issue-72616.stderr
@@ -2,7 +2,7 @@ error[E0283]: type annotations needed
   --> $DIR/issue-72616.rs:20:30
    |
 LL |         if String::from("a") == "a".try_into().unwrap() {}
-   |                              ^^ -------------- this method call resolves to `std::result::Result<T, <Self as TryInto<T>>::Error>`
+   |                              ^^ -------------- this method call resolves to `Result<T, <Self as TryInto<T>>::Error>`
    |                              |
    |                              cannot infer type
    |
diff --git a/src/test/ui/issue-74047.stderr b/src/test/ui/issue-74047.stderr
index 8f7c91a78d8..28174825d8b 100644
--- a/src/test/ui/issue-74047.stderr
+++ b/src/test/ui/issue-74047.stderr
@@ -5,7 +5,7 @@ LL | impl TryFrom<OtherStream> for MyStream {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Error`, `try_from` in implementation
    |
    = help: implement the missing item: `type Error = Type;`
-   = help: implement the missing item: `fn try_from(_: T) -> std::result::Result<Self, <Self as TryFrom<T>>::Error> { todo!() }`
+   = help: implement the missing item: `fn try_from(_: T) -> Result<Self, <Self as TryFrom<T>>::Error> { todo!() }`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-11844.stderr b/src/test/ui/issues/issue-11844.stderr
index 00eecbc9a98..9d7470e7af9 100644
--- a/src/test/ui/issues/issue-11844.stderr
+++ b/src/test/ui/issues/issue-11844.stderr
@@ -4,10 +4,10 @@ error[E0308]: mismatched types
 LL |     match a {
    |           - this expression has type `Option<Box<{integer}>>`
 LL |         Ok(a) =>
-   |         ^^^^^ expected enum `Option`, found enum `std::result::Result`
+   |         ^^^^^ expected enum `Option`, found enum `Result`
    |
    = note: expected enum `Option<Box<{integer}>>`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-12552.stderr b/src/test/ui/issues/issue-12552.stderr
index 1594c9f503a..3d8852ca748 100644
--- a/src/test/ui/issues/issue-12552.stderr
+++ b/src/test/ui/issues/issue-12552.stderr
@@ -2,23 +2,23 @@ error[E0308]: mismatched types
   --> $DIR/issue-12552.rs:6:5
    |
 LL |   match t {
-   |         - this expression has type `std::result::Result<_, {integer}>`
+   |         - this expression has type `Result<_, {integer}>`
 LL |     Some(k) => match k {
-   |     ^^^^^^^ expected enum `std::result::Result`, found enum `Option`
+   |     ^^^^^^^ expected enum `Result`, found enum `Option`
    |
-   = note: expected enum `std::result::Result<_, {integer}>`
+   = note: expected enum `Result<_, {integer}>`
               found enum `Option<_>`
 
 error[E0308]: mismatched types
   --> $DIR/issue-12552.rs:9:5
    |
 LL |   match t {
-   |         - this expression has type `std::result::Result<_, {integer}>`
+   |         - this expression has type `Result<_, {integer}>`
 ...
 LL |     None => ()
-   |     ^^^^ expected enum `std::result::Result`, found enum `Option`
+   |     ^^^^ expected enum `Result`, found enum `Option`
    |
-   = note: expected enum `std::result::Result<_, {integer}>`
+   = note: expected enum `Result<_, {integer}>`
               found enum `Option<_>`
 
 error: aborting due to 2 previous errors
diff --git a/src/test/ui/issues/issue-13466.rs b/src/test/ui/issues/issue-13466.rs
index 8048dae1239..a420c7704af 100644
--- a/src/test/ui/issues/issue-13466.rs
+++ b/src/test/ui/issues/issue-13466.rs
@@ -8,13 +8,13 @@ pub fn main() {
         Ok(u) => u,
         //~^ ERROR mismatched types
         //~| expected enum `Option<{integer}>`
-        //~| found enum `std::result::Result<_, _>`
-        //~| expected enum `Option`, found enum `std::result::Result`
+        //~| found enum `Result<_, _>`
+        //~| expected enum `Option`, found enum `Result`
 
         Err(e) => panic!(e)
         //~^ ERROR mismatched types
         //~| expected enum `Option<{integer}>`
-        //~| found enum `std::result::Result<_, _>`
-        //~| expected enum `Option`, found enum `std::result::Result`
+        //~| found enum `Result<_, _>`
+        //~| expected enum `Option`, found enum `Result`
     };
 }
diff --git a/src/test/ui/issues/issue-13466.stderr b/src/test/ui/issues/issue-13466.stderr
index 792cc398bb8..c78466f4e8c 100644
--- a/src/test/ui/issues/issue-13466.stderr
+++ b/src/test/ui/issues/issue-13466.stderr
@@ -4,10 +4,10 @@ error[E0308]: mismatched types
 LL |     let _x: usize = match Some(1) {
    |                           ------- this expression has type `Option<{integer}>`
 LL |         Ok(u) => u,
-   |         ^^^^^ expected enum `Option`, found enum `std::result::Result`
+   |         ^^^^^ expected enum `Option`, found enum `Result`
    |
    = note: expected enum `Option<{integer}>`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error[E0308]: mismatched types
   --> $DIR/issue-13466.rs:14:9
@@ -16,10 +16,10 @@ LL |     let _x: usize = match Some(1) {
    |                           ------- this expression has type `Option<{integer}>`
 ...
 LL |         Err(e) => panic!(e)
-   |         ^^^^^^ expected enum `Option`, found enum `std::result::Result`
+   |         ^^^^^^ expected enum `Option`, found enum `Result`
    |
    = note: expected enum `Option<{integer}>`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/issues/issue-21332.rs b/src/test/ui/issues/issue-21332.rs
index 1b13f000b8c..6547f3a9b19 100644
--- a/src/test/ui/issues/issue-21332.rs
+++ b/src/test/ui/issues/issue-21332.rs
@@ -4,7 +4,7 @@ impl Iterator for S {
     type Item = i32;
     fn next(&mut self) -> Result<i32, i32> { Ok(7) }
     //~^ ERROR method `next` has an incompatible type for trait
-    //~| expected enum `Option`, found enum `std::result::Result`
+    //~| expected enum `Option`, found enum `Result`
 }
 
 fn main() {}
diff --git a/src/test/ui/issues/issue-21332.stderr b/src/test/ui/issues/issue-21332.stderr
index 1d6ddd2660e..35863fbebe3 100644
--- a/src/test/ui/issues/issue-21332.stderr
+++ b/src/test/ui/issues/issue-21332.stderr
@@ -2,10 +2,10 @@ error[E0053]: method `next` has an incompatible type for trait
   --> $DIR/issue-21332.rs:5:5
    |
 LL |     fn next(&mut self) -> Result<i32, i32> { Ok(7) }
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `Option`, found enum `std::result::Result`
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected enum `Option`, found enum `Result`
    |
    = note: expected fn pointer `fn(&mut S) -> Option<i32>`
-              found fn pointer `fn(&mut S) -> std::result::Result<i32, i32>`
+              found fn pointer `fn(&mut S) -> Result<i32, i32>`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-3680.rs b/src/test/ui/issues/issue-3680.rs
index 8912e7a18ac..37c9000c043 100644
--- a/src/test/ui/issues/issue-3680.rs
+++ b/src/test/ui/issues/issue-3680.rs
@@ -3,7 +3,7 @@ fn main() {
         Err(_) => ()
         //~^ ERROR mismatched types
         //~| expected enum `Option<_>`
-        //~| found enum `std::result::Result<_, _>`
-        //~| expected enum `Option`, found enum `std::result::Result`
+        //~| found enum `Result<_, _>`
+        //~| expected enum `Option`, found enum `Result`
     }
 }
diff --git a/src/test/ui/issues/issue-3680.stderr b/src/test/ui/issues/issue-3680.stderr
index 479942b8e2c..e8fafa76b91 100644
--- a/src/test/ui/issues/issue-3680.stderr
+++ b/src/test/ui/issues/issue-3680.stderr
@@ -4,10 +4,10 @@ error[E0308]: mismatched types
 LL |     match None {
    |           ---- this expression has type `Option<_>`
 LL |         Err(_) => ()
-   |         ^^^^^^ expected enum `Option`, found enum `std::result::Result`
+   |         ^^^^^^ expected enum `Option`, found enum `Result`
    |
    = note: expected enum `Option<_>`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr
index e41c04ee89e..9711e27d8a8 100644
--- a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr
+++ b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr
@@ -1,4 +1,4 @@
-error[E0599]: the method `as_deref` exists for enum `std::result::Result<{integer}, _>`, but its trait bounds were not satisfied
+error[E0599]: the method `as_deref` exists for enum `Result<{integer}, _>`, but its trait bounds were not satisfied
   --> $DIR/result-as_deref.rs:2:27
    |
 LL |     let _result = &Ok(42).as_deref();
diff --git a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr
index 372d056fc19..ee7ea1e6a02 100644
--- a/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr
+++ b/src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr
@@ -1,8 +1,8 @@
-error[E0599]: the method `as_deref_mut` exists for enum `std::result::Result<{integer}, _>`, but its trait bounds were not satisfied
+error[E0599]: the method `as_deref_mut` exists for enum `Result<{integer}, _>`, but its trait bounds were not satisfied
   --> $DIR/result-as_deref_mut.rs:2:31
    |
 LL |     let _result = &mut Ok(42).as_deref_mut();
-   |                               ^^^^^^^^^^^^ method cannot be called on `std::result::Result<{integer}, _>` due to unsatisfied trait bounds
+   |                               ^^^^^^^^^^^^ method cannot be called on `Result<{integer}, _>` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `{integer}: DerefMut`
diff --git a/src/test/ui/issues/issue-51632-try-desugar-incompatible-types.stderr b/src/test/ui/issues/issue-51632-try-desugar-incompatible-types.stderr
index 9ca983df30a..554ac7e7c75 100644
--- a/src/test/ui/issues/issue-51632-try-desugar-incompatible-types.stderr
+++ b/src/test/ui/issues/issue-51632-try-desugar-incompatible-types.stderr
@@ -2,9 +2,9 @@ error[E0308]: try expression alternatives have incompatible types
   --> $DIR/issue-51632-try-desugar-incompatible-types.rs:8:5
    |
 LL |     missing_discourses()?
-   |     ^^^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `isize`
+   |     ^^^^^^^^^^^^^^^^^^^^^ expected enum `Result`, found `isize`
    |
-   = note: expected enum `std::result::Result<isize, ()>`
+   = note: expected enum `Result<isize, ()>`
               found type `isize`
 help: try removing this `?`
    |
diff --git a/src/test/ui/issues/issue-6458-4.stderr b/src/test/ui/issues/issue-6458-4.stderr
index 00ebff9007d..0cf82d37d5d 100644
--- a/src/test/ui/issues/issue-6458-4.stderr
+++ b/src/test/ui/issues/issue-6458-4.stderr
@@ -2,13 +2,13 @@ error[E0308]: mismatched types
   --> $DIR/issue-6458-4.rs:1:20
    |
 LL | fn foo(b: bool) -> Result<bool,String> {
-   |    ---             ^^^^^^^^^^^^^^^^^^^ expected enum `std::result::Result`, found `()`
+   |    ---             ^^^^^^^^^^^^^^^^^^^ expected enum `Result`, found `()`
    |    |
    |    implicitly returns `()` as its body has no tail or `return` expression
 LL |     Err("bar".to_string());
    |                           - help: consider removing this semicolon
    |
-   = note:   expected enum `std::result::Result<bool, String>`
+   = note:   expected enum `Result<bool, String>`
            found unit type `()`
 
 error: aborting due to previous error
diff --git a/src/test/ui/lifetimes/lifetime-elision-return-type-trait.stderr b/src/test/ui/lifetimes/lifetime-elision-return-type-trait.stderr
index c3d597bec2e..ef1127c59ac 100644
--- a/src/test/ui/lifetimes/lifetime-elision-return-type-trait.stderr
+++ b/src/test/ui/lifetimes/lifetime-elision-return-type-trait.stderr
@@ -1,8 +1,8 @@
-error[E0277]: the trait bound `std::result::Result<(), _>: Future` is not satisfied
+error[E0277]: the trait bound `Result<(), _>: Future` is not satisfied
   --> $DIR/lifetime-elision-return-type-trait.rs:8:13
    |
 LL | fn foo() -> impl Future<Item=(), Error=Box<dyn Error>> {
-   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Future` is not implemented for `std::result::Result<(), _>`
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Future` is not implemented for `Result<(), _>`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/lint/lint-ctypes-enum.stderr b/src/test/ui/lint/lint-ctypes-enum.stderr
index 8917d309e60..f3991ab4177 100644
--- a/src/test/ui/lint/lint-ctypes-enum.stderr
+++ b/src/test/ui/lint/lint-ctypes-enum.stderr
@@ -97,7 +97,7 @@ LL |    fn repr_rust(x: Option<Rust<num::NonZeroU8>>);
    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
    = note: enum has no representation hint
 
-error: `extern` block uses type `std::result::Result<(), NonZeroI32>`, which is not FFI-safe
+error: `extern` block uses type `Result<(), NonZeroI32>`, which is not FFI-safe
   --> $DIR/lint-ctypes-enum.rs:90:20
    |
 LL |    fn no_result(x: Result<(), num::NonZeroI32>);
diff --git a/src/test/ui/lint/must_use-tuple.rs b/src/test/ui/lint/must_use-tuple.rs
index f6b579a7f35..0f0aa20253c 100644
--- a/src/test/ui/lint/must_use-tuple.rs
+++ b/src/test/ui/lint/must_use-tuple.rs
@@ -5,13 +5,13 @@ fn foo() -> (Result<(), ()>, ()) {
 }
 
 fn main() {
-    (Ok::<(), ()>(()),); //~ ERROR unused `std::result::Result`
+    (Ok::<(), ()>(()),); //~ ERROR unused `Result`
 
     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
-    //~^ ERROR unused `std::result::Result`
-    //~^^ ERROR unused `std::result::Result`
+    //~^ ERROR unused `Result`
+    //~^^ ERROR unused `Result`
 
-    foo(); //~ ERROR unused `std::result::Result`
+    foo(); //~ ERROR unused `Result`
 
-    ((Err::<(), ()>(()), ()), ()); //~ ERROR unused `std::result::Result`
+    ((Err::<(), ()>(()), ()), ()); //~ ERROR unused `Result`
 }
diff --git a/src/test/ui/lint/must_use-tuple.stderr b/src/test/ui/lint/must_use-tuple.stderr
index de3c6f46c68..0532d89e039 100644
--- a/src/test/ui/lint/must_use-tuple.stderr
+++ b/src/test/ui/lint/must_use-tuple.stderr
@@ -1,4 +1,4 @@
-error: unused `std::result::Result` in tuple element 0 that must be used
+error: unused `Result` in tuple element 0 that must be used
   --> $DIR/must_use-tuple.rs:8:6
    |
 LL |     (Ok::<(), ()>(()),);
@@ -11,7 +11,7 @@ LL | #![deny(unused_must_use)]
    |         ^^^^^^^^^^^^^^^
    = note: this `Result` may be an `Err` variant, which should be handled
 
-error: unused `std::result::Result` in tuple element 0 that must be used
+error: unused `Result` in tuple element 0 that must be used
   --> $DIR/must_use-tuple.rs:10:6
    |
 LL |     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
@@ -19,7 +19,7 @@ LL |     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
    |
    = note: this `Result` may be an `Err` variant, which should be handled
 
-error: unused `std::result::Result` in tuple element 2 that must be used
+error: unused `Result` in tuple element 2 that must be used
   --> $DIR/must_use-tuple.rs:10:27
    |
 LL |     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
@@ -27,7 +27,7 @@ LL |     (Ok::<(), ()>(()), 0, Ok::<(), ()>(()), 5);
    |
    = note: this `Result` may be an `Err` variant, which should be handled
 
-error: unused `std::result::Result` in tuple element 0 that must be used
+error: unused `Result` in tuple element 0 that must be used
   --> $DIR/must_use-tuple.rs:14:5
    |
 LL |     foo();
@@ -35,7 +35,7 @@ LL |     foo();
    |
    = note: this `Result` may be an `Err` variant, which should be handled
 
-error: unused `std::result::Result` in tuple element 0 that must be used
+error: unused `Result` in tuple element 0 that must be used
   --> $DIR/must_use-tuple.rs:16:6
    |
 LL |     ((Err::<(), ()>(()), ()), ());
diff --git a/src/test/ui/macros/must-use-in-macro-55516.stderr b/src/test/ui/macros/must-use-in-macro-55516.stderr
index a694c887085..b4072a1ad7e 100644
--- a/src/test/ui/macros/must-use-in-macro-55516.stderr
+++ b/src/test/ui/macros/must-use-in-macro-55516.stderr
@@ -1,4 +1,4 @@
-warning: unused `std::result::Result` that must be used
+warning: unused `Result` that must be used
   --> $DIR/must-use-in-macro-55516.rs:9:5
    |
 LL |     write!(&mut example, "{}", 42);
diff --git a/src/test/ui/mismatched_types/abridged.stderr b/src/test/ui/mismatched_types/abridged.stderr
index b7564686cd5..61994e5bfee 100644
--- a/src/test/ui/mismatched_types/abridged.stderr
+++ b/src/test/ui/mismatched_types/abridged.stderr
@@ -15,10 +15,10 @@ error[E0308]: mismatched types
 LL | fn a2() -> Foo {
    |            --- expected `Foo` because of return type
 LL |     Ok(Foo { bar: 1})
-   |     ^^^^^^^^^^^^^^^^^ expected struct `Foo`, found enum `std::result::Result`
+   |     ^^^^^^^^^^^^^^^^^ expected struct `Foo`, found enum `Result`
    |
    = note: expected struct `Foo`
-                found enum `std::result::Result<Foo, _>`
+                found enum `Result<Foo, _>`
 
 error[E0308]: mismatched types
   --> $DIR/abridged.rs:24:5
@@ -38,14 +38,14 @@ error[E0308]: mismatched types
   --> $DIR/abridged.rs:28:5
    |
 LL | fn c() -> Result<Foo, Bar> {
-   |           ---------------- expected `std::result::Result<Foo, Bar>` because of return type
+   |           ---------------- expected `Result<Foo, Bar>` because of return type
 LL |     Foo { bar: 1 }
    |     ^^^^^^^^^^^^^^
    |     |
-   |     expected enum `std::result::Result`, found struct `Foo`
+   |     expected enum `Result`, found struct `Foo`
    |     help: try using a variant of the expected enum: `Ok(Foo { bar: 1 })`
    |
-   = note: expected enum `std::result::Result<Foo, Bar>`
+   = note: expected enum `Result<Foo, Bar>`
             found struct `Foo`
 
 error[E0308]: mismatched types
diff --git a/src/test/ui/mismatched_types/binops.rs b/src/test/ui/mismatched_types/binops.rs
index 4be7420e33c..f359451dfb8 100644
--- a/src/test/ui/mismatched_types/binops.rs
+++ b/src/test/ui/mismatched_types/binops.rs
@@ -4,5 +4,5 @@ fn main() {
     3 * (); //~ ERROR cannot multiply `{integer}` by `()`
     4 / ""; //~ ERROR cannot divide `{integer}` by `&str`
     5 < String::new(); //~ ERROR can't compare `{integer}` with `String`
-    6 == Ok(1); //~ ERROR can't compare `{integer}` with `std::result::Result<{integer}, _>`
+    6 == Ok(1); //~ ERROR can't compare `{integer}` with `Result<{integer}, _>`
 }
diff --git a/src/test/ui/mismatched_types/binops.stderr b/src/test/ui/mismatched_types/binops.stderr
index f2bfb12ee9c..19e921dd04d 100644
--- a/src/test/ui/mismatched_types/binops.stderr
+++ b/src/test/ui/mismatched_types/binops.stderr
@@ -38,13 +38,13 @@ LL |     5 < String::new();
    |
    = help: the trait `PartialOrd<String>` is not implemented for `{integer}`
 
-error[E0277]: can't compare `{integer}` with `std::result::Result<{integer}, _>`
+error[E0277]: can't compare `{integer}` with `Result<{integer}, _>`
   --> $DIR/binops.rs:7:7
    |
 LL |     6 == Ok(1);
-   |       ^^ no implementation for `{integer} == std::result::Result<{integer}, _>`
+   |       ^^ no implementation for `{integer} == Result<{integer}, _>`
    |
-   = help: the trait `PartialEq<std::result::Result<{integer}, _>>` is not implemented for `{integer}`
+   = help: the trait `PartialEq<Result<{integer}, _>>` is not implemented for `{integer}`
 
 error: aborting due to 6 previous errors
 
diff --git a/src/test/ui/mismatched_types/method-help-unsatisfied-bound.stderr b/src/test/ui/mismatched_types/method-help-unsatisfied-bound.stderr
index 92a88cbdb34..1030061b2d1 100644
--- a/src/test/ui/mismatched_types/method-help-unsatisfied-bound.stderr
+++ b/src/test/ui/mismatched_types/method-help-unsatisfied-bound.stderr
@@ -1,11 +1,11 @@
-error[E0599]: the method `unwrap` exists for enum `std::result::Result<(), Foo>`, but its trait bounds were not satisfied
+error[E0599]: the method `unwrap` exists for enum `Result<(), Foo>`, but its trait bounds were not satisfied
   --> $DIR/method-help-unsatisfied-bound.rs:5:7
    |
 LL | struct Foo;
    | ----------- doesn't satisfy `Foo: Debug`
 ...
 LL |     a.unwrap();
-   |       ^^^^^^ method cannot be called on `std::result::Result<(), Foo>` due to unsatisfied trait bounds
+   |       ^^^^^^ method cannot be called on `Result<(), Foo>` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `Foo: Debug`
diff --git a/src/test/ui/nll/issue-54556-niconii.stderr b/src/test/ui/nll/issue-54556-niconii.stderr
index b4791fd22b4..1bfebd755b4 100644
--- a/src/test/ui/nll/issue-54556-niconii.stderr
+++ b/src/test/ui/nll/issue-54556-niconii.stderr
@@ -11,7 +11,7 @@ LL | }
    | -
    | |
    | `counter` dropped here while still borrowed
-   | ... and the borrow might be used here, when that temporary is dropped and runs the destructor for type `std::result::Result<MutexGuard<'_>, ()>`
+   | ... and the borrow might be used here, when that temporary is dropped and runs the destructor for type `Result<MutexGuard<'_>, ()>`
    |
 help: consider adding semicolon after the expression so its temporaries are dropped sooner, before the local variables declared by the block are dropped
    |
diff --git a/src/test/ui/or-patterns/inconsistent-modes.stderr b/src/test/ui/or-patterns/inconsistent-modes.stderr
index c5dcef36e05..15790771043 100644
--- a/src/test/ui/or-patterns/inconsistent-modes.stderr
+++ b/src/test/ui/or-patterns/inconsistent-modes.stderr
@@ -65,7 +65,7 @@ error[E0308]: mismatched types
   --> $DIR/inconsistent-modes.rs:14:31
    |
 LL |     let Ok((ref a, b)) | Err((ref mut a, ref b)) = Ok((0, &0));
-   |             -----             ^^^^^^^^^            ----------- this expression has type `std::result::Result<({integer}, &{integer}), (_, _)>`
+   |             -----             ^^^^^^^^^            ----------- this expression has type `Result<({integer}, &{integer}), (_, _)>`
    |             |                 |
    |             |                 types differ in mutability
    |             first introduced with type `&{integer}` here
diff --git a/src/test/ui/parser/unclosed-delimiter-in-dep.stderr b/src/test/ui/parser/unclosed-delimiter-in-dep.stderr
index d63a50034c5..00861a5a3d4 100644
--- a/src/test/ui/parser/unclosed-delimiter-in-dep.stderr
+++ b/src/test/ui/parser/unclosed-delimiter-in-dep.stderr
@@ -13,12 +13,12 @@ error[E0308]: mismatched types
   --> $DIR/unclosed-delimiter-in-dep.rs:4:20
    |
 LL |     let _: usize = unclosed_delim_mod::new();
-   |            -----   ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `usize`, found enum `std::result::Result`
+   |            -----   ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `usize`, found enum `Result`
    |            |
    |            expected due to this
    |
    = note: expected type `usize`
-              found enum `std::result::Result<Value, ()>`
+              found enum `Result<Value, ()>`
 
 error: aborting due to 2 previous errors
 
diff --git a/src/test/ui/pattern/bindings-after-at/borrowck-move-and-move.stderr b/src/test/ui/pattern/bindings-after-at/borrowck-move-and-move.stderr
index bfb7b479731..ff8183e8763 100644
--- a/src/test/ui/pattern/bindings-after-at/borrowck-move-and-move.stderr
+++ b/src/test/ui/pattern/bindings-after-at/borrowck-move-and-move.stderr
@@ -33,7 +33,7 @@ error[E0382]: use of moved value
   --> $DIR/borrowck-move-and-move.rs:20:16
    |
 LL |     match Ok(U) {
-   |           ----- move occurs because value has type `std::result::Result<U, U>`, which does not implement the `Copy` trait
+   |           ----- move occurs because value has type `Result<U, U>`, which does not implement the `Copy` trait
 LL |         a @ Ok(b) | a @ Err(b) => {}
    |         -------^-
    |         |      |
@@ -44,7 +44,7 @@ error[E0382]: use of moved value
   --> $DIR/borrowck-move-and-move.rs:20:29
    |
 LL |     match Ok(U) {
-   |           ----- move occurs because value has type `std::result::Result<U, U>`, which does not implement the `Copy` trait
+   |           ----- move occurs because value has type `Result<U, U>`, which does not implement the `Copy` trait
 LL |         a @ Ok(b) | a @ Err(b) => {}
    |                     --------^-
    |                     |       |
diff --git a/src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr b/src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr
index 00136c25764..13032c3838a 100644
--- a/src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr
+++ b/src/test/ui/pattern/bindings-after-at/borrowck-pat-ref-mut-and-ref.stderr
@@ -390,7 +390,7 @@ error[E0507]: cannot move out of `a` in pattern guard
   --> $DIR/borrowck-pat-ref-mut-and-ref.rs:111:66
    |
 LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
-   |                                                                  ^ move occurs because `a` has type `&mut std::result::Result<U, U>`, which does not implement the `Copy` trait
+   |                                                                  ^ move occurs because `a` has type `&mut Result<U, U>`, which does not implement the `Copy` trait
    |
    = note: variables bound in patterns cannot be moved from until after the end of the pattern guard
 
@@ -398,7 +398,7 @@ error[E0507]: cannot move out of `a` in pattern guard
   --> $DIR/borrowck-pat-ref-mut-and-ref.rs:111:66
    |
 LL |         ref mut a @ Ok(ref b) | ref mut a @ Err(ref b) if { drop(a); false } => {}
-   |                                                                  ^ move occurs because `a` has type `&mut std::result::Result<U, U>`, which does not implement the `Copy` trait
+   |                                                                  ^ move occurs because `a` has type `&mut Result<U, U>`, which does not implement the `Copy` trait
    |
    = note: variables bound in patterns cannot be moved from until after the end of the pattern guard
 
diff --git a/src/test/ui/pattern/pat-struct-field-expr-has-type.stderr b/src/test/ui/pattern/pat-struct-field-expr-has-type.stderr
index d57a8a0dbc1..3a61d4293b0 100644
--- a/src/test/ui/pattern/pat-struct-field-expr-has-type.stderr
+++ b/src/test/ui/pattern/pat-struct-field-expr-has-type.stderr
@@ -4,10 +4,10 @@ error[E0308]: mismatched types
 LL |     match (S { f: 42 }) {
    |           ------------- this expression has type `S`
 LL |         S { f: Ok(_) } => {}
-   |                ^^^^^ expected `u8`, found enum `std::result::Result`
+   |                ^^^^^ expected `u8`, found enum `Result`
    |
    = note: expected type `u8`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error: aborting due to previous error
 
diff --git a/src/test/ui/pattern/pat-type-err-let-stmt.stderr b/src/test/ui/pattern/pat-type-err-let-stmt.stderr
index 42258cfc1ae..4b4fb089283 100644
--- a/src/test/ui/pattern/pat-type-err-let-stmt.stderr
+++ b/src/test/ui/pattern/pat-type-err-let-stmt.stderr
@@ -17,10 +17,10 @@ error[E0308]: mismatched types
 LL |     let Ok(0): Option<u8> = 42u8;
    |         ^^^^^  ---------- expected due to this
    |         |
-   |         expected enum `Option`, found enum `std::result::Result`
+   |         expected enum `Option`, found enum `Result`
    |
    = note: expected enum `Option<u8>`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error[E0308]: mismatched types
   --> $DIR/pat-type-err-let-stmt.rs:11:9
@@ -28,10 +28,10 @@ error[E0308]: mismatched types
 LL |     let Ok(0): Option<u8>;
    |         ^^^^^  ---------- expected due to this
    |         |
-   |         expected enum `Option`, found enum `std::result::Result`
+   |         expected enum `Option`, found enum `Result`
    |
    = note: expected enum `Option<u8>`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error[E0308]: mismatched types
   --> $DIR/pat-type-err-let-stmt.rs:15:9
@@ -39,10 +39,10 @@ error[E0308]: mismatched types
 LL |     let Ok(0) = 42u8;
    |         ^^^^^   ---- this expression has type `u8`
    |         |
-   |         expected `u8`, found enum `std::result::Result`
+   |         expected `u8`, found enum `Result`
    |
    = note: expected type `u8`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error: aborting due to 4 previous errors
 
diff --git a/src/test/ui/pattern/usefulness/non-exhaustive-match-nested.stderr b/src/test/ui/pattern/usefulness/non-exhaustive-match-nested.stderr
index d1cab752102..928e9068266 100644
--- a/src/test/ui/pattern/usefulness/non-exhaustive-match-nested.stderr
+++ b/src/test/ui/pattern/usefulness/non-exhaustive-match-nested.stderr
@@ -5,7 +5,7 @@ LL |     match (l1, l2) {
    |           ^^^^^^^^ pattern `(Some(&[]), Err(_))` not covered
    |
    = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
-   = note: the matched value is of type `(Option<&[T]>, std::result::Result<&[T], ()>)`
+   = note: the matched value is of type `(Option<&[T]>, Result<&[T], ()>)`
 
 error[E0004]: non-exhaustive patterns: `A(C)` not covered
   --> $DIR/non-exhaustive-match-nested.rs:15:11
diff --git a/src/test/ui/recursion/recursive-types-are-not-uninhabited.stderr b/src/test/ui/recursion/recursive-types-are-not-uninhabited.stderr
index c6f500ec8cc..dfb69a3cc1b 100644
--- a/src/test/ui/recursion/recursive-types-are-not-uninhabited.stderr
+++ b/src/test/ui/recursion/recursive-types-are-not-uninhabited.stderr
@@ -11,7 +11,7 @@ LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
    |
    = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
    = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
-   = note: the matched value is of type `std::result::Result<u32, &R>`
+   = note: the matched value is of type `Result<u32, &R>`
 help: you might want to use `if let` to ignore the variant that isn't matched
    |
 LL |     if let Ok(x) = res { /* */ }
diff --git a/src/test/ui/rfc-1937-termination-trait/termination-trait-test-wrong-type.stderr b/src/test/ui/rfc-1937-termination-trait/termination-trait-test-wrong-type.stderr
index d015b72c5cf..45806201861 100644
--- a/src/test/ui/rfc-1937-termination-trait/termination-trait-test-wrong-type.stderr
+++ b/src/test/ui/rfc-1937-termination-trait/termination-trait-test-wrong-type.stderr
@@ -1,4 +1,4 @@
-error[E0277]: `main` has invalid return type `std::result::Result<f32, ParseFloatError>`
+error[E0277]: `main` has invalid return type `Result<f32, ParseFloatError>`
   --> $DIR/termination-trait-test-wrong-type.rs:6:1
    |
 LL | / fn can_parse_zero_as_f32() -> Result<f32, ParseFloatError> {
@@ -11,7 +11,7 @@ LL | | }
 LL |   pub fn assert_test_result<T: Termination>(result: T) {
    |                                ----------- required by this bound in `assert_test_result`
    |
-   = help: the trait `Termination` is not implemented for `std::result::Result<f32, ParseFloatError>`
+   = help: the trait `Termination` is not implemented for `Result<f32, ParseFloatError>`
    = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to previous error
diff --git a/src/test/ui/rfc-2294-if-let-guard/typeck.stderr b/src/test/ui/rfc-2294-if-let-guard/typeck.stderr
index 7ce93fe7348..6407128d8d8 100644
--- a/src/test/ui/rfc-2294-if-let-guard/typeck.stderr
+++ b/src/test/ui/rfc-2294-if-let-guard/typeck.stderr
@@ -2,10 +2,10 @@ error[E0308]: mismatched types
   --> $DIR/typeck.rs:10:22
    |
 LL |         Ok(x) if let Err(_) = x => {},
-   |                      ^^^^^^ expected enum `Option`, found enum `std::result::Result`
+   |                      ^^^^^^ expected enum `Option`, found enum `Result`
    |
    = note: expected enum `Option<bool>`
-              found enum `std::result::Result<_, _>`
+              found enum `Result<_, _>`
 
 error[E0308]: mismatched types
   --> $DIR/typeck.rs:12:22
diff --git a/src/test/ui/span/impl-wrong-item-for-trait.stderr b/src/test/ui/span/impl-wrong-item-for-trait.stderr
index 9b0aad28b0a..de200ca0721 100644
--- a/src/test/ui/span/impl-wrong-item-for-trait.stderr
+++ b/src/test/ui/span/impl-wrong-item-for-trait.stderr
@@ -64,7 +64,7 @@ error[E0046]: not all trait items implemented, missing: `fmt`
 LL | impl Debug for FooTypeForMethod {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `fmt` in implementation
    |
-   = help: implement the missing item: `fn fmt(&self, _: &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error> { todo!() }`
+   = help: implement the missing item: `fn fmt(&self, _: &mut Formatter<'_>) -> Result<(), std::fmt::Error> { todo!() }`
 
 error: aborting due to 8 previous errors
 
diff --git a/src/test/ui/suggestions/as-ref.stderr b/src/test/ui/suggestions/as-ref.stderr
index 4b5a9be7e5b..7e4d7fb3933 100644
--- a/src/test/ui/suggestions/as-ref.stderr
+++ b/src/test/ui/suggestions/as-ref.stderr
@@ -47,12 +47,12 @@ error[E0308]: mismatched types
   --> $DIR/as-ref.rs:19:35
    |
 LL |   let y: Result<&usize, &usize> = x;
-   |          ----------------------   ^ expected enum `std::result::Result`, found reference
+   |          ----------------------   ^ expected enum `Result`, found reference
    |          |
    |          expected due to this
    |
-   = note:   expected enum `std::result::Result<&usize, &usize>`
-           found reference `&std::result::Result<usize, usize>`
+   = note:   expected enum `Result<&usize, &usize>`
+           found reference `&Result<usize, usize>`
 help: you can convert from `&Result<T, E>` to `Result<&T, &E>` using `.as_ref()`
    |
 LL |   let y: Result<&usize, &usize> = x.as_ref();
@@ -62,12 +62,12 @@ error[E0308]: mismatched types
   --> $DIR/as-ref.rs:23:34
    |
 LL |   let y: Result<&usize, usize> = x;
-   |          ---------------------   ^ expected enum `std::result::Result`, found reference
+   |          ---------------------   ^ expected enum `Result`, found reference
    |          |
    |          expected due to this
    |
-   = note:   expected enum `std::result::Result<&usize, usize>`
-           found reference `&std::result::Result<usize, usize>`
+   = note:   expected enum `Result<&usize, usize>`
+           found reference `&Result<usize, usize>`
 
 error: aborting due to 7 previous errors
 
diff --git a/src/test/ui/suggestions/mut-ref-reassignment.stderr b/src/test/ui/suggestions/mut-ref-reassignment.stderr
index e31c4dc66c8..327bbee1968 100644
--- a/src/test/ui/suggestions/mut-ref-reassignment.stderr
+++ b/src/test/ui/suggestions/mut-ref-reassignment.stderr
@@ -17,7 +17,7 @@ error[E0308]: mismatched types
 LL |     opt = None
    |           ^^^^ expected mutable reference, found enum `Option`
    |
-   = note: expected mutable reference `&mut std::result::Result<String, ()>`
+   = note: expected mutable reference `&mut Result<String, ()>`
                            found enum `Option<_>`
 
 error[E0308]: mismatched types
diff --git a/src/test/ui/suggestions/option-content-move.stderr b/src/test/ui/suggestions/option-content-move.stderr
index 0f3dd346e85..c00a0f1700b 100644
--- a/src/test/ui/suggestions/option-content-move.stderr
+++ b/src/test/ui/suggestions/option-content-move.stderr
@@ -13,7 +13,7 @@ error[E0507]: cannot move out of `selection.1` which is behind a shared referenc
 LL |                 if selection.1.unwrap().contains(selection.0) {
    |                    ^^^^^^^^^^^
    |                    |
-   |                    move occurs because `selection.1` has type `std::result::Result<String, String>`, which does not implement the `Copy` trait
+   |                    move occurs because `selection.1` has type `Result<String, String>`, which does not implement the `Copy` trait
    |                    help: consider borrowing the `Result`'s content: `selection.1.as_ref()`
 
 error: aborting due to 2 previous errors
diff --git a/src/test/ui/suggestions/suggest-box.stderr b/src/test/ui/suggestions/suggest-box.stderr
index 57c83baf4f8..8107fd86212 100644
--- a/src/test/ui/suggestions/suggest-box.stderr
+++ b/src/test/ui/suggestions/suggest-box.stderr
@@ -10,7 +10,7 @@ LL | |         Ok(())
 LL | |     };
    | |_____^ expected struct `Box`, found closure
    |
-   = note: expected struct `Box<dyn Fn() -> std::result::Result<(), ()>>`
+   = note: expected struct `Box<dyn Fn() -> Result<(), ()>>`
              found closure `[closure@$DIR/suggest-box.rs:4:47: 7:6]`
    = note: for more on the distinction between the stack and the heap, read https://doc.rust-lang.org/book/ch15-01-box.html, https://doc.rust-lang.org/rust-by-example/std/box.html, and https://doc.rust-lang.org/std/boxed/index.html
 help: store this in the heap by calling `Box::new`
diff --git a/src/test/ui/traits/self-without-lifetime-constraint.stderr b/src/test/ui/traits/self-without-lifetime-constraint.stderr
index 6c7abe753e2..73b5aec022c 100644
--- a/src/test/ui/traits/self-without-lifetime-constraint.stderr
+++ b/src/test/ui/traits/self-without-lifetime-constraint.stderr
@@ -2,13 +2,13 @@ error: `impl` item signature doesn't match `trait` item signature
   --> $DIR/self-without-lifetime-constraint.rs:45:5
    |
 LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>;
-   |     -------------------------------------------------------------------- expected `fn(ValueRef<'_>) -> std::result::Result<(&str, &&str), FromSqlError>`
+   |     -------------------------------------------------------------------- expected `fn(ValueRef<'_>) -> Result<(&str, &&str), FromSqlError>`
 ...
 LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> {
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'_>) -> std::result::Result<(&str, &&str), FromSqlError>`
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'_>) -> Result<(&str, &&str), FromSqlError>`
    |
-   = note: expected `fn(ValueRef<'_>) -> std::result::Result<(&str, &&str), _>`
-              found `fn(ValueRef<'_>) -> std::result::Result<(&str, &&str), _>`
+   = note: expected `fn(ValueRef<'_>) -> Result<(&str, &&str), _>`
+              found `fn(ValueRef<'_>) -> Result<(&str, &&str), _>`
 help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
   --> $DIR/self-without-lifetime-constraint.rs:41:60
    |
diff --git a/src/test/ui/try-block/try-block-bad-type.stderr b/src/test/ui/try-block/try-block-bad-type.stderr
index cadf3a841c9..2d1313d7d0e 100644
--- a/src/test/ui/try-block/try-block-bad-type.stderr
+++ b/src/test/ui/try-block/try-block-bad-type.stderr
@@ -13,13 +13,13 @@ LL |         Err("")?;
            and 2 others
    = note: required by `from`
 
-error[E0271]: type mismatch resolving `<std::result::Result<i32, i32> as Try>::Ok == &str`
+error[E0271]: type mismatch resolving `<Result<i32, i32> as Try>::Ok == &str`
   --> $DIR/try-block-bad-type.rs:12:9
    |
 LL |         ""
    |         ^^ expected `i32`, found `&str`
 
-error[E0271]: type mismatch resolving `<std::result::Result<i32, i32> as Try>::Ok == ()`
+error[E0271]: type mismatch resolving `<Result<i32, i32> as Try>::Ok == ()`
   --> $DIR/try-block-bad-type.rs:15:39
    |
 LL |     let res: Result<i32, i32> = try { };
diff --git a/src/test/ui/uninhabited/uninhabited-matches-feature-gated.stderr b/src/test/ui/uninhabited/uninhabited-matches-feature-gated.stderr
index 7b999f50773..4f2f9e070fe 100644
--- a/src/test/ui/uninhabited/uninhabited-matches-feature-gated.stderr
+++ b/src/test/ui/uninhabited/uninhabited-matches-feature-gated.stderr
@@ -10,7 +10,7 @@ LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
    |     --- not covered
    |
    = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
-   = note: the matched value is of type `std::result::Result<u32, &Void>`
+   = note: the matched value is of type `Result<u32, &Void>`
 
 error[E0004]: non-exhaustive patterns: type `&Void` is non-empty
   --> $DIR/uninhabited-matches-feature-gated.rs:15:19
@@ -64,7 +64,7 @@ LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
    |     --- not covered
    |
    = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
-   = note: the matched value is of type `std::result::Result<u32, Void>`
+   = note: the matched value is of type `Result<u32, Void>`
 
 error[E0005]: refutable pattern in local binding: `Err(_)` not covered
   --> $DIR/uninhabited-matches-feature-gated.rs:37:9
@@ -79,7 +79,7 @@ LL |     Err(#[stable(feature = "rust1", since = "1.0.0")] E),
    |
    = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
    = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
-   = note: the matched value is of type `std::result::Result<u32, Void>`
+   = note: the matched value is of type `Result<u32, Void>`
 help: you might want to use `if let` to ignore the variant that isn't matched
    |
 LL |     if let Ok(x) = x { /* */ }