Auto merge of #125378 - lcnr:tracing-no-lines, r=oli-obk

remove tracing tree indent lines

This allows vscode to collapse nested spans without having to manually remove the indent lines. This is incredibly useful when logging the new solver. I don't mind making them optional depending on some environment flag if you prefer using indent lines

For a gist of the new output, see https://gist.github.com/lcnr/bb4360ddbc5cd4631f2fbc569057e5eb#file-example-output-L181

r? `@oli-obk`

12 files changed, 48 insertions, 43 deletions

diff --git a/compiler/rustc_log/src/lib.rs b/compiler/rustc_log/src/lib.rs
index e11c45b66e6..41b26ecce3c 100644
--- a/compiler/rustc_log/src/lib.rs
+++ b/compiler/rustc_log/src/lib.rs
@@ -103,7 +103,6 @@ pub fn init_logger(cfg: LoggerConfig) -> Result<(), Error> {
 
     let mut layer = tracing_tree::HierarchicalLayer::default()
         .with_writer(io::stderr)
-        .with_indent_lines(true)
         .with_ansi(color_logs)
         .with_targets(true)
         .with_verbose_exit(verbose_entry_exit)
diff --git a/compiler/rustc_pattern_analysis/tests/common/mod.rs b/compiler/rustc_pattern_analysis/tests/common/mod.rs
index e72fddb9e9a..6e8bb505005 100644
--- a/compiler/rustc_pattern_analysis/tests/common/mod.rs
+++ b/compiler/rustc_pattern_analysis/tests/common/mod.rs
@@ -13,7 +13,6 @@ pub fn init_tracing() {
     use tracing_subscriber::Layer;
     let _ = tracing_tree::HierarchicalLayer::default()
         .with_writer(std::io::stderr)
-        .with_indent_lines(true)
         .with_ansi(true)
         .with_targets(true)
         .with_indent_amount(2)
diff --git a/compiler/rustc_trait_selection/src/solve/search_graph.rs b/compiler/rustc_trait_selection/src/solve/search_graph.rs
index f1b8bf4676e..84878fea101 100644
--- a/compiler/rustc_trait_selection/src/solve/search_graph.rs
+++ b/compiler/rustc_trait_selection/src/solve/search_graph.rs
@@ -281,6 +281,7 @@ impl<'tcx> SearchGraph<TyCtxt<'tcx>> {
         };
 
         if let Some(result) = self.lookup_global_cache(tcx, input, available_depth, inspect) {
+            debug!("global cache hit");
             return result;
         }
 
@@ -365,7 +366,7 @@ impl<'tcx> SearchGraph<TyCtxt<'tcx>> {
                 for _ in 0..FIXPOINT_STEP_LIMIT {
                     match self.fixpoint_step_in_task(tcx, input, inspect, &mut prove_goal) {
                         StepResult::Done(final_entry, result) => return (final_entry, result),
-                        StepResult::HasChanged => {}
+                        StepResult::HasChanged => debug!("fixpoint changed provisional results"),
                     }
                 }
 
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 55346c768b6..c0d2f9cfaf9 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -200,7 +200,6 @@ fn init_logging(early_dcx: &EarlyDiagCtxt) {
     let filter = tracing_subscriber::EnvFilter::from_env("RUSTDOC_LOG");
     let layer = tracing_tree::HierarchicalLayer::default()
         .with_writer(io::stderr)
-        .with_indent_lines(true)
         .with_ansi(color_logs)
         .with_targets(true)
         .with_wraparound(10)
diff --git a/tests/run-make/rust-lld-by-default/rmake.rs b/tests/run-make/rust-lld-by-default/rmake.rs
index 6a8dae1043e..8ab16394a91 100644
--- a/tests/run-make/rust-lld-by-default/rmake.rs
+++ b/tests/run-make/rust-lld-by-default/rmake.rs
@@ -17,8 +17,9 @@ fn main() {
         .input("main.rs")
         .run();
     assert!(
-        find_lld_version_in_logs(output),
-        "the LLD version string should be present in the output logs"
+        find_lld_version_in_logs(&output),
+        "the LLD version string should be present in the output logs:\n{}",
+        std::str::from_utf8(&output.stderr).unwrap()
     );
 
     // But it can still be disabled by turning the linker feature off.
@@ -29,13 +30,14 @@ fn main() {
         .input("main.rs")
         .run();
     assert!(
-        !find_lld_version_in_logs(output),
-        "the LLD version string should not be present in the output logs"
+        !find_lld_version_in_logs(&output),
+        "the LLD version string should not be present in the output logs:\n{}",
+        std::str::from_utf8(&output.stderr).unwrap()
     );
 }
 
-fn find_lld_version_in_logs(output: Output) -> bool {
+fn find_lld_version_in_logs(output: &Output) -> bool {
     let lld_version_re = Regex::new(r"^LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
     let stderr = std::str::from_utf8(&output.stderr).unwrap();
-    stderr.lines().any(|line| lld_version_re.is_match(line))
+    stderr.lines().any(|line| lld_version_re.is_match(line.trim()))
 }
diff --git a/tests/run-make/rust-lld-custom-target/rmake.rs b/tests/run-make/rust-lld-custom-target/rmake.rs
index 9bdb69f47d8..e6c4a321d00 100644
--- a/tests/run-make/rust-lld-custom-target/rmake.rs
+++ b/tests/run-make/rust-lld-custom-target/rmake.rs
@@ -23,8 +23,9 @@ fn main() {
         .input("lib.rs")
         .run();
     assert!(
-        find_lld_version_in_logs(output),
-        "the LLD version string should be present in the output logs"
+        find_lld_version_in_logs(&output),
+        "the LLD version string should be present in the output logs:\n{}",
+        std::str::from_utf8(&output.stderr).unwrap()
     );
 
     // But it can also be disabled via linker features.
@@ -37,13 +38,14 @@ fn main() {
         .input("lib.rs")
         .run();
     assert!(
-        !find_lld_version_in_logs(output),
-        "the LLD version string should not be present in the output logs"
+        !find_lld_version_in_logs(&output),
+        "the LLD version string should not be present in the output logs:\n{}",
+        std::str::from_utf8(&output.stderr).unwrap()
     );
 }
 
-fn find_lld_version_in_logs(output: Output) -> bool {
+fn find_lld_version_in_logs(output: &Output) -> bool {
     let lld_version_re = Regex::new(r"^LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
     let stderr = std::str::from_utf8(&output.stderr).unwrap();
-    stderr.lines().any(|line| lld_version_re.is_match(line))
+    stderr.lines().any(|line| lld_version_re.is_match(line.trim()))
 }
diff --git a/tests/run-make/rust-lld/rmake.rs b/tests/run-make/rust-lld/rmake.rs
index feeb82e709e..a74e858045d 100644
--- a/tests/run-make/rust-lld/rmake.rs
+++ b/tests/run-make/rust-lld/rmake.rs
@@ -21,8 +21,9 @@ fn main() {
         .input("main.rs")
         .run();
     assert!(
-        find_lld_version_in_logs(output),
-        "the LLD version string should be present in the output logs"
+        find_lld_version_in_logs(&output),
+        "the LLD version string should be present in the output logs:\n{}",
+        std::str::from_utf8(&output.stderr).unwrap()
     );
 
     // It should not be used when we explictly opt-out of lld.
@@ -33,8 +34,9 @@ fn main() {
         .input("main.rs")
         .run();
     assert!(
-        !find_lld_version_in_logs(output),
-        "the LLD version string should not be present in the output logs"
+        !find_lld_version_in_logs(&output),
+        "the LLD version string should not be present in the output logs:\n{}",
+        std::str::from_utf8(&output.stderr).unwrap()
     );
 
     // While we're here, also check that the last linker feature flag "wins" when passed multiple
@@ -50,13 +52,14 @@ fn main() {
         .input("main.rs")
         .run();
     assert!(
-        find_lld_version_in_logs(output),
-        "the LLD version string should be present in the output logs"
+        find_lld_version_in_logs(&output),
+        "the LLD version string should be present in the output logs:\n{}",
+        std::str::from_utf8(&output.stderr).unwrap()
     );
 }
 
-fn find_lld_version_in_logs(output: Output) -> bool {
+fn find_lld_version_in_logs(output: &Output) -> bool {
     let lld_version_re = Regex::new(r"^LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
     let stderr = std::str::from_utf8(&output.stderr).unwrap();
-    stderr.lines().any(|line| lld_version_re.is_match(line))
+    stderr.lines().any(|line| lld_version_re.is_match(line.trim()))
 }
diff --git a/tests/ui/coherence/occurs-check/associated-type.next.stderr b/tests/ui/coherence/occurs-check/associated-type.next.stderr
index 7443459b830..d809a6948f3 100644
--- a/tests/ui/coherence/occurs-check/associated-type.next.stderr
+++ b/tests/ui/coherence/occurs-check/associated-type.next.stderr
@@ -1,7 +1,7 @@
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
 error[E0119]: conflicting implementations of trait `Overlap<for<'a> fn(&'a (), ())>` for type `for<'a> fn(&'a (), ())`
   --> $DIR/associated-type.rs:31:1
    |
diff --git a/tests/ui/coherence/occurs-check/associated-type.old.stderr b/tests/ui/coherence/occurs-check/associated-type.old.stderr
index 38a02c906d4..329086ab7df 100644
--- a/tests/ui/coherence/occurs-check/associated-type.old.stderr
+++ b/tests/ui/coherence/occurs-check/associated-type.old.stderr
@@ -1,11 +1,11 @@
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, '^0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [*const ?1t, !2_0.Named(DefId(0:27 ~ associated_type[f554]::{impl#3}::'a#1), "'a")], def_id: DefId(0:5 ~ associated_type[f554]::ToUnit::Unit) }
 error[E0119]: conflicting implementations of trait `Overlap<for<'a> fn(&'a (), _)>` for type `for<'a> fn(&'a (), _)`
   --> $DIR/associated-type.rs:31:1
    |
diff --git a/tests/ui/higher-ranked/structually-relate-aliases.stderr b/tests/ui/higher-ranked/structually-relate-aliases.stderr
index 59fab52b221..2f1dfd19c48 100644
--- a/tests/ui/higher-ranked/structually-relate-aliases.stderr
+++ b/tests/ui/higher-ranked/structually-relate-aliases.stderr
@@ -1,5 +1,5 @@
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, '^0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, !2_0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, '^0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: [?1t, !2_0.Named(DefId(0:15 ~ structually_relate_aliases[de75]::{impl#1}::'a), "'a")], def_id: DefId(0:5 ~ structually_relate_aliases[de75]::ToUnit::Unit) }
 error[E0277]: the trait bound `for<'a> T: ToUnit<'a>` is not satisfied
   --> $DIR/structually-relate-aliases.rs:13:36
    |
diff --git a/tests/ui/self/arbitrary-self-from-method-substs.default.stderr b/tests/ui/self/arbitrary-self-from-method-substs.default.stderr
index bd0519f66c0..6fff086a89c 100644
--- a/tests/ui/self/arbitrary-self-from-method-substs.default.stderr
+++ b/tests/ui/self/arbitrary-self-from-method-substs.default.stderr
@@ -9,7 +9,7 @@ LL |     fn get<R: Deref<Target = Self>>(self: R) -> u32 {
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = help: consider changing to `self`, `&self`, `&mut self`, `self: Box<Self>`, `self: Rc<Self>`, `self: Arc<Self>`, or `self: Pin<P>` (where P is one of the previous types except `Self`)
 
-ERROR rustc_hir_typeck::method::confirm Foo was a subtype of &Foo but now is not?
+ ERROR rustc_hir_typeck::method::confirm Foo was a subtype of &Foo but now is not?
 error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0658`.
diff --git a/tests/ui/traits/next-solver/issue-118950-root-region.stderr b/tests/ui/traits/next-solver/issue-118950-root-region.stderr
index 2e0566cad08..17da1f52479 100644
--- a/tests/ui/traits/next-solver/issue-118950-root-region.stderr
+++ b/tests/ui/traits/next-solver/issue-118950-root-region.stderr
@@ -25,10 +25,10 @@ help: this trait has no implementations, consider adding one
 LL | trait ToUnit<'a> {
    | ^^^^^^^^^^^^^^^^
 
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
-WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
+ WARN rustc_infer::infer::relate::generalize may incompletely handle alias type: AliasTy { args: ['^0.Named(DefId(0:15 ~ issue_118950_root_region[d54f]::{impl#1}::'a), "'a"), ?1t], def_id: DefId(0:8 ~ issue_118950_root_region[d54f]::Assoc) }
 error[E0119]: conflicting implementations of trait `Overlap<fn(_)>` for type `fn(_)`
   --> $DIR/issue-118950-root-region.rs:19:1
    |