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authorbors <bors@rust-lang.org>2023-07-14 17:32:59 +0000
committerbors <bors@rust-lang.org>2023-07-14 17:32:59 +0000
commit079e544174b79c372b4b4b473a01d699f128c2de (patch)
tree3e61f67d695553329d8f042e8d5a0227185e8618
parent5767cad9b8b58a5c0521c5ddd652a24d0c65f466 (diff)
parentf993c6d73e3edfd362620b72799a53e4a96ae775 (diff)
downloadrust-079e544174b79c372b4b4b473a01d699f128c2de.tar.gz
rust-079e544174b79c372b4b4b473a01d699f128c2de.zip
Auto merge of #109025 - cjgillot:refprop-dbg, r=JakobDegen
Enable MIR reference propagation by default
-rw-r--r--compiler/rustc_mir_transform/src/lib.rs2
-rw-r--r--compiler/rustc_mir_transform/src/ref_prop.rs42
-rw-r--r--tests/codegen/iter-repeat-n-trivial-drop.rs2
-rw-r--r--tests/codegen/slice-init.rs16
-rw-r--r--tests/codegen/slice-ref-equality.rs32
-rw-r--r--tests/incremental/hashes/call_expressions.rs2
-rw-r--r--tests/mir-opt/casts.redundant.InstSimplify.diff2
-rw-r--r--tests/mir-opt/copy-prop/mutate_through_pointer.rs2
-rw-r--r--tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-abort.diff11
-rw-r--r--tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-unwind.diff11
-rw-r--r--tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-abort.mir5
-rw-r--r--tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-unwind.mir5
-rw-r--r--tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-abort.diff40
-rw-r--r--tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-unwind.diff40
-rw-r--r--tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-abort.mir34
-rw-r--r--tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-unwind.mir34
-rw-r--r--tests/mir-opt/pre-codegen/checked_ops.step_forward.PreCodegen.after.mir40
-rw-r--r--tests/mir-opt/pre-codegen/loops.filter_mapped.PreCodegen.after.mir42
-rw-r--r--tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir98
-rw-r--r--tests/mir-opt/pre-codegen/loops.mapped.PreCodegen.after.mir4
-rw-r--r--tests/mir-opt/pre-codegen/loops.vec_move.PreCodegen.after.mir4
-rw-r--r--tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir20
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-abort.mir112
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-unwind.mir112
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-abort.mir2
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-unwind.mir2
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-abort.mir52
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-unwind.mir52
-rw-r--r--tests/mir-opt/pre-codegen/slice_filter.variant_a-{closure#0}.PreCodegen.after.mir248
-rw-r--r--tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-abort.mir60
-rw-r--r--tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-unwind.mir60
-rw-r--r--tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir2
-rw-r--r--tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir2
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-abort.mir4
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-unwind.mir4
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-abort.mir4
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-unwind.mir4
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-abort.mir133
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-unwind.mir133
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-abort.mir60
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-unwind.mir60
-rw-r--r--tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-abort.mir6
-rw-r--r--tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-unwind.mir6
43 files changed, 704 insertions, 902 deletions
diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs
index fa8257cf984..d419329f2d6 100644
--- a/compiler/rustc_mir_transform/src/lib.rs
+++ b/compiler/rustc_mir_transform/src/lib.rs
@@ -553,6 +553,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
             &normalize_array_len::NormalizeArrayLen, // has to run after `slice::len` lowering
             &const_goto::ConstGoto,
             &remove_unneeded_drops::RemoveUnneededDrops,
+            &ref_prop::ReferencePropagation,
             &sroa::ScalarReplacementOfAggregates,
             &match_branches::MatchBranchSimplification,
             // inst combine is after MatchBranchSimplification to clean up Ne(_1, false)
@@ -560,7 +561,6 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
             &instsimplify::InstSimplify,
             &simplify::SimplifyLocals::BeforeConstProp,
             &copy_prop::CopyProp,
-            &ref_prop::ReferencePropagation,
             // Perform `SeparateConstSwitch` after SSA-based analyses, as cloning blocks may
             // destroy the SSA property. It should still happen before const-propagation, so the
             // latter pass will leverage the created opportunities.
diff --git a/compiler/rustc_mir_transform/src/ref_prop.rs b/compiler/rustc_mir_transform/src/ref_prop.rs
index bbd9f76ba5c..c17c791f9c3 100644
--- a/compiler/rustc_mir_transform/src/ref_prop.rs
+++ b/compiler/rustc_mir_transform/src/ref_prop.rs
@@ -71,7 +71,7 @@ pub struct ReferencePropagation;
 
 impl<'tcx> MirPass<'tcx> for ReferencePropagation {
     fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
-        sess.mir_opt_level() >= 4
+        sess.mir_opt_level() >= 2
     }
 
     #[instrument(level = "trace", skip(self, tcx, body))]
@@ -355,7 +355,10 @@ impl<'tcx> MutVisitor<'tcx> for Replacer<'tcx> {
     }
 
     fn visit_var_debug_info(&mut self, debuginfo: &mut VarDebugInfo<'tcx>) {
-        if let VarDebugInfoContents::Place(ref mut place) = debuginfo.value
+        // If the debuginfo is a pointer to another place:
+        // - if it's a reborrow, see through it;
+        // - if it's a direct borrow, increase `debuginfo.references`.
+        while let VarDebugInfoContents::Place(ref mut place) = debuginfo.value
             && place.projection.is_empty()
             && let Value::Pointer(target, _) = self.targets[place.local]
             && target.projection.iter().all(|p| p.can_use_in_debuginfo())
@@ -369,28 +372,37 @@ impl<'tcx> MutVisitor<'tcx> for Replacer<'tcx> {
                 debuginfo.references = references;
                 *place = target;
                 self.any_replacement = true;
+            } else {
+                break
             }
         }
+
+        // Simplify eventual projections left inside `debuginfo`.
+        self.super_var_debug_info(debuginfo);
     }
 
     fn visit_place(&mut self, place: &mut Place<'tcx>, ctxt: PlaceContext, loc: Location) {
-        if place.projection.first() != Some(&PlaceElem::Deref) {
-            return;
-        }
-
         loop {
-            if let Value::Pointer(target, _) = self.targets[place.local] {
-                let perform_opt = matches!(ctxt, PlaceContext::NonUse(_))
-                    || self.allowed_replacements.contains(&(target.local, loc));
-
-                if perform_opt {
-                    *place = target.project_deeper(&place.projection[1..], self.tcx);
-                    self.any_replacement = true;
-                    continue;
+            if place.projection.first() != Some(&PlaceElem::Deref) {
+                return;
+            }
+
+            let Value::Pointer(target, _) = self.targets[place.local] else { return };
+
+            let perform_opt = match ctxt {
+                PlaceContext::NonUse(NonUseContext::VarDebugInfo) => {
+                    target.projection.iter().all(|p| p.can_use_in_debuginfo())
                 }
+                PlaceContext::NonUse(_) => true,
+                _ => self.allowed_replacements.contains(&(target.local, loc)),
+            };
+
+            if !perform_opt {
+                return;
             }
 
-            break;
+            *place = target.project_deeper(&place.projection[1..], self.tcx);
+            self.any_replacement = true;
         }
     }
 
diff --git a/tests/codegen/iter-repeat-n-trivial-drop.rs b/tests/codegen/iter-repeat-n-trivial-drop.rs
index 24059f190ac..65a0f7e7ffb 100644
--- a/tests/codegen/iter-repeat-n-trivial-drop.rs
+++ b/tests/codegen/iter-repeat-n-trivial-drop.rs
@@ -33,7 +33,7 @@ pub fn iter_repeat_n_next(it: &mut std::iter::RepeatN<NotCopy>) -> Option<NotCop
 
     // CHECK: [[EMPTY]]:
     // CHECK-NOT: br
-    // CHECK: phi i16 [ undef, %start ], [ %[[VAL]], %[[NOT_EMPTY]] ]
+    // CHECK: phi i16 [ %[[VAL]], %[[NOT_EMPTY]] ], [ undef, %start ]
     // CHECK-NOT: br
     // CHECK: ret
 
diff --git a/tests/codegen/slice-init.rs b/tests/codegen/slice-init.rs
index 794b773a776..d80628cb1d4 100644
--- a/tests/codegen/slice-init.rs
+++ b/tests/codegen/slice-init.rs
@@ -8,7 +8,7 @@ pub fn zero_sized_elem() {
     // CHECK-NOT: br label %repeat_loop_header{{.*}}
     // CHECK-NOT: call void @llvm.memset.p0
     let x = [(); 4];
-    drop(&x);
+    opaque(&x);
 }
 
 // CHECK-LABEL: @zero_len_array
@@ -17,7 +17,7 @@ pub fn zero_len_array() {
     // CHECK-NOT: br label %repeat_loop_header{{.*}}
     // CHECK-NOT: call void @llvm.memset.p0
     let x = [4; 0];
-    drop(&x);
+    opaque(&x);
 }
 
 // CHECK-LABEL: @byte_array
@@ -26,7 +26,7 @@ pub fn byte_array() {
     // CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 7, i{{[0-9]+}} 4
     // CHECK-NOT: br label %repeat_loop_header{{.*}}
     let x = [7u8; 4];
-    drop(&x);
+    opaque(&x);
 }
 
 #[allow(dead_code)]
@@ -42,7 +42,7 @@ pub fn byte_enum_array() {
     // CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 {{.*}}, i{{[0-9]+}} 4
     // CHECK-NOT: br label %repeat_loop_header{{.*}}
     let x = [Init::Memset; 4];
-    drop(&x);
+    opaque(&x);
 }
 
 // CHECK-LABEL: @zeroed_integer_array
@@ -51,7 +51,7 @@ pub fn zeroed_integer_array() {
     // CHECK: call void @llvm.memset.{{.+}}({{i8\*|ptr}} {{.*}}, i8 0, i{{[0-9]+}} 16
     // CHECK-NOT: br label %repeat_loop_header{{.*}}
     let x = [0u32; 4];
-    drop(&x);
+    opaque(&x);
 }
 
 // CHECK-LABEL: @nonzero_integer_array
@@ -60,5 +60,9 @@ pub fn nonzero_integer_array() {
     // CHECK: br label %repeat_loop_header{{.*}}
     // CHECK-NOT: call void @llvm.memset.p0
     let x = [0x1a_2b_3c_4d_u32; 4];
-    drop(&x);
+    opaque(&x);
 }
+
+// Use an opaque function to prevent rustc from removing useless drops.
+#[inline(never)]
+pub fn opaque(_: impl Sized) {}
diff --git a/tests/codegen/slice-ref-equality.rs b/tests/codegen/slice-ref-equality.rs
index 8f0adab35e7..c91e5bc3cd0 100644
--- a/tests/codegen/slice-ref-equality.rs
+++ b/tests/codegen/slice-ref-equality.rs
@@ -44,48 +44,48 @@ pub fn is_zero_array(data: &[u8; 4]) -> bool {
 // equality for non-byte types also just emit a `bcmp`, not a loop.
 
 // CHECK-LABEL: @eq_slice_of_nested_u8(
-// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %1
-// CHECK-SAME: [[USIZE]] noundef %3
+// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
+// CHECK-SAME: [[USIZE]] noundef %y.1
 #[no_mangle]
 fn eq_slice_of_nested_u8(x: &[[u8; 3]], y: &[[u8; 3]]) -> bool {
-    // CHECK: icmp eq [[USIZE]] %1, %3
-    // CHECK: %[[BYTES:.+]] = mul nsw [[USIZE]] %1, 3
+    // CHECK: icmp eq [[USIZE]] %x.1, %y.1
+    // CHECK: %[[BYTES:.+]] = mul nsw [[USIZE]] %x.1, 3
     // CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}({{i8\*|ptr}}
     // CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
     x == y
 }
 
 // CHECK-LABEL: @eq_slice_of_i32(
-// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %1
-// CHECK-SAME: [[USIZE]] noundef %3
+// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
+// CHECK-SAME: [[USIZE]] noundef %y.1
 #[no_mangle]
 fn eq_slice_of_i32(x: &[i32], y: &[i32]) -> bool {
-    // CHECK: icmp eq [[USIZE]] %1, %3
-    // CHECK: %[[BYTES:.+]] = shl nsw [[USIZE]] %1, 2
+    // CHECK: icmp eq [[USIZE]] %x.1, %y.1
+    // CHECK: %[[BYTES:.+]] = shl nsw [[USIZE]] %x.1, 2
     // CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}({{i32\*|ptr}}
     // CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
     x == y
 }
 
 // CHECK-LABEL: @eq_slice_of_nonzero(
-// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %1
-// CHECK-SAME: [[USIZE]] noundef %3
+// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
+// CHECK-SAME: [[USIZE]] noundef %y.1
 #[no_mangle]
 fn eq_slice_of_nonzero(x: &[NonZeroU32], y: &[NonZeroU32]) -> bool {
-    // CHECK: icmp eq [[USIZE]] %1, %3
-    // CHECK: %[[BYTES:.+]] = shl nsw [[USIZE]] %1, 2
+    // CHECK: icmp eq [[USIZE]] %x.1, %y.1
+    // CHECK: %[[BYTES:.+]] = shl nsw [[USIZE]] %x.1, 2
     // CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}({{i32\*|ptr}}
     // CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
     x == y
 }
 
 // CHECK-LABEL: @eq_slice_of_option_of_nonzero(
-// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %1
-// CHECK-SAME: [[USIZE]] noundef %3
+// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
+// CHECK-SAME: [[USIZE]] noundef %y.1
 #[no_mangle]
 fn eq_slice_of_option_of_nonzero(x: &[Option<NonZeroI16>], y: &[Option<NonZeroI16>]) -> bool {
-    // CHECK: icmp eq [[USIZE]] %1, %3
-    // CHECK: %[[BYTES:.+]] = shl nsw [[USIZE]] %1, 1
+    // CHECK: icmp eq [[USIZE]] %x.1, %y.1
+    // CHECK: %[[BYTES:.+]] = shl nsw [[USIZE]] %x.1, 1
     // CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}({{i16\*|ptr}}
     // CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
     x == y
diff --git a/tests/incremental/hashes/call_expressions.rs b/tests/incremental/hashes/call_expressions.rs
index 65df2e8292a..a42cf6aa477 100644
--- a/tests/incremental/hashes/call_expressions.rs
+++ b/tests/incremental/hashes/call_expressions.rs
@@ -162,7 +162,7 @@ pub fn change_to_ufcs() {
 }
 
 #[cfg(not(any(cfail1,cfail4)))]
-#[rustc_clean(cfg="cfail2", except="hir_owner_nodes,optimized_mir,typeck")]
+#[rustc_clean(cfg="cfail2", except="hir_owner_nodes,typeck")]
 #[rustc_clean(cfg="cfail3")]
 #[rustc_clean(cfg="cfail5", except="hir_owner_nodes,optimized_mir,typeck")]
 #[rustc_clean(cfg="cfail6")]
diff --git a/tests/mir-opt/casts.redundant.InstSimplify.diff b/tests/mir-opt/casts.redundant.InstSimplify.diff
index ff6d11c4596..f5ea78aecbe 100644
--- a/tests/mir-opt/casts.redundant.InstSimplify.diff
+++ b/tests/mir-opt/casts.redundant.InstSimplify.diff
@@ -7,7 +7,7 @@
       let mut _2: *const &u8;
       let mut _3: *const &u8;
       scope 1 (inlined generic_cast::<&u8, &u8>) {
-          debug x => _3;
+          debug x => _1;
       }
   
       bb0: {
diff --git a/tests/mir-opt/copy-prop/mutate_through_pointer.rs b/tests/mir-opt/copy-prop/mutate_through_pointer.rs
index da142e33948..753787089b5 100644
--- a/tests/mir-opt/copy-prop/mutate_through_pointer.rs
+++ b/tests/mir-opt/copy-prop/mutate_through_pointer.rs
@@ -1,3 +1,5 @@
+// unit-test: CopyProp
+//
 // This attempts to mutate `a` via a pointer derived from `addr_of!(a)`. That is UB
 // according to Miri. However, the decision to make this UB - and to allow
 // rustc to rely on that fact for the purpose of optimizations - has not been
diff --git a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-abort.diff b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-abort.diff
index e3c57347392..486f276b21c 100644
--- a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-abort.diff
+++ b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-abort.diff
@@ -7,8 +7,7 @@
       let mut _2: std::option::Option<T>;
 +     scope 1 (inlined #[track_caller] Option::<T>::unwrap_unchecked) {
 +         debug self => _2;
-+         let mut _3: &std::option::Option<T>;
-+         let mut _4: isize;
++         let mut _3: isize;
 +         scope 2 {
 +             debug val => _0;
 +         }
@@ -21,7 +20,7 @@
 +             }
 +         }
 +         scope 4 (inlined Option::<T>::is_some) {
-+             debug self => _3;
++             debug self => &_2;
 +         }
 +     }
   
@@ -29,9 +28,8 @@
           StorageLive(_2);
           _2 = move _1;
 -         _0 = Option::<T>::unwrap_unchecked(move _2) -> [return: bb1, unwind unreachable];
-+         StorageLive(_3);
-+         _4 = discriminant(_2);
-+         switchInt(move _4) -> [1: bb2, otherwise: bb1];
++         _3 = discriminant(_2);
++         switchInt(move _3) -> [1: bb2, otherwise: bb1];
       }
   
       bb1: {
@@ -40,7 +38,6 @@
 + 
 +     bb2: {
 +         _0 = move ((_2 as Some).0: T);
-+         StorageDead(_3);
           StorageDead(_2);
           return;
       }
diff --git a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-unwind.diff b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-unwind.diff
index fc638cb3ace..1c3aa537946 100644
--- a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-unwind.diff
+++ b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.Inline.panic-unwind.diff
@@ -7,8 +7,7 @@
       let mut _2: std::option::Option<T>;
 +     scope 1 (inlined #[track_caller] Option::<T>::unwrap_unchecked) {
 +         debug self => _2;
-+         let mut _3: &std::option::Option<T>;
-+         let mut _4: isize;
++         let mut _3: isize;
 +         scope 2 {
 +             debug val => _0;
 +         }
@@ -21,7 +20,7 @@
 +             }
 +         }
 +         scope 4 (inlined Option::<T>::is_some) {
-+             debug self => _3;
++             debug self => &_2;
 +         }
 +     }
   
@@ -29,9 +28,8 @@
           StorageLive(_2);
           _2 = move _1;
 -         _0 = Option::<T>::unwrap_unchecked(move _2) -> [return: bb1, unwind: bb2];
-+         StorageLive(_3);
-+         _4 = discriminant(_2);
-+         switchInt(move _4) -> [1: bb2, otherwise: bb1];
++         _3 = discriminant(_2);
++         switchInt(move _3) -> [1: bb2, otherwise: bb1];
       }
   
       bb1: {
@@ -44,7 +42,6 @@
 -         resume;
 +     bb2: {
 +         _0 = move ((_2 as Some).0: T);
-+         StorageDead(_3);
 +         StorageDead(_2);
 +         return;
       }
diff --git a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-abort.mir b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-abort.mir
index fcc4d43ced6..82238626798 100644
--- a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-abort.mir
@@ -6,7 +6,6 @@ fn unwrap_unchecked(_1: Option<T>) -> T {
     scope 1 (inlined #[track_caller] Option::<T>::unwrap_unchecked) {
         debug self => _1;
         let mut _2: isize;
-        let mut _3: &std::option::Option<T>;
         scope 2 {
             debug val => _0;
         }
@@ -19,19 +18,17 @@ fn unwrap_unchecked(_1: Option<T>) -> T {
             }
         }
         scope 4 (inlined Option::<T>::is_some) {
-            debug self => _3;
+            debug self => &_1;
         }
     }
 
     bb0: {
-        StorageLive(_3);
         _2 = discriminant(_1);
         switchInt(move _2) -> [1: bb1, otherwise: bb2];
     }
 
     bb1: {
         _0 = move ((_1 as Some).0: T);
-        StorageDead(_3);
         return;
     }
 
diff --git a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-unwind.mir
index fcc4d43ced6..82238626798 100644
--- a/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/inline/unwrap_unchecked.unwrap_unchecked.PreCodegen.after.panic-unwind.mir
@@ -6,7 +6,6 @@ fn unwrap_unchecked(_1: Option<T>) -> T {
     scope 1 (inlined #[track_caller] Option::<T>::unwrap_unchecked) {
         debug self => _1;
         let mut _2: isize;
-        let mut _3: &std::option::Option<T>;
         scope 2 {
             debug val => _0;
         }
@@ -19,19 +18,17 @@ fn unwrap_unchecked(_1: Option<T>) -> T {
             }
         }
         scope 4 (inlined Option::<T>::is_some) {
-            debug self => _3;
+            debug self => &_1;
         }
     }
 
     bb0: {
-        StorageLive(_3);
         _2 = discriminant(_1);
         switchInt(move _2) -> [1: bb1, otherwise: bb2];
     }
 
     bb1: {
         _0 = move ((_1 as Some).0: T);
-        StorageDead(_3);
         return;
     }
 
diff --git a/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-abort.diff b/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-abort.diff
index 1cc44ce06cf..b647455aeec 100644
--- a/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-abort.diff
+++ b/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-abort.diff
@@ -6,20 +6,16 @@
       let mut _0: ();
       let _2: &[T];
       let mut _3: &[T; 3];
-      let _4: &[T; 3];
-      let _5: [T; 3];
+      let _4: [T; 3];
+      let mut _5: T;
       let mut _6: T;
       let mut _7: T;
-      let mut _8: T;
+      let mut _8: usize;
       let mut _9: usize;
-      let mut _10: usize;
-      let mut _11: bool;
-      let mut _15: !;
+      let mut _10: bool;
+      let mut _11: !;
       scope 1 {
           debug v => _2;
-          let _12: &T;
-          let _13: &T;
-          let _14: &T;
           scope 2 {
               debug v1 => &(*_2)[0 of 3];
               debug v2 => &(*_2)[1 of 3];
@@ -28,26 +24,26 @@
       }
   
       bb0: {
-          StorageLive(_2);
-          StorageLive(_5);
-          _5 = [_1, _1, _1];
-          _4 = &_5;
-          _2 = _4 as &[T] (PointerCoercion(Unsize));
-          _9 = Len((*_2));
-          _10 = const 3_usize;
--         _11 = Eq(move _9, const 3_usize);
--         switchInt(move _11) -> [0: bb1, otherwise: bb2];
+          StorageLive(_3);
+          StorageLive(_4);
+          _4 = [_1, _1, _1];
+          _3 = &_4;
+          _2 = move _3 as &[T] (PointerCoercion(Unsize));
+          StorageDead(_3);
+          _8 = Len((*_2));
+          _9 = const 3_usize;
+-         _10 = Eq(move _8, const 3_usize);
+-         switchInt(move _10) -> [0: bb1, otherwise: bb2];
 +         nop;
-+         switchInt(move _9) -> [3: bb2, otherwise: bb1];
++         switchInt(move _8) -> [3: bb2, otherwise: bb1];
       }
   
       bb1: {
-          _15 = core::panicking::panic(const "internal error: entered unreachable code") -> unwind unreachable;
+          _11 = core::panicking::panic(const "internal error: entered unreachable code") -> unwind unreachable;
       }
   
       bb2: {
-          StorageDead(_5);
-          StorageDead(_2);
+          StorageDead(_4);
           return;
       }
   }
diff --git a/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-unwind.diff b/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-unwind.diff
index b708f667438..b02be61d031 100644
--- a/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-unwind.diff
+++ b/tests/mir-opt/issue_76432.test.SimplifyComparisonIntegral.panic-unwind.diff
@@ -6,20 +6,16 @@
       let mut _0: ();
       let _2: &[T];
       let mut _3: &[T; 3];
-      let _4: &[T; 3];
-      let _5: [T; 3];
+      let _4: [T; 3];
+      let mut _5: T;
       let mut _6: T;
       let mut _7: T;
-      let mut _8: T;
+      let mut _8: usize;
       let mut _9: usize;
-      let mut _10: usize;
-      let mut _11: bool;
-      let mut _15: !;
+      let mut _10: bool;
+      let mut _11: !;
       scope 1 {
           debug v => _2;
-          let _12: &T;
-          let _13: &T;
-          let _14: &T;
           scope 2 {
               debug v1 => &(*_2)[0 of 3];
               debug v2 => &(*_2)[1 of 3];
@@ -28,26 +24,26 @@
       }
   
       bb0: {
-          StorageLive(_2);
-          StorageLive(_5);
-          _5 = [_1, _1, _1];
-          _4 = &_5;
-          _2 = _4 as &[T] (PointerCoercion(Unsize));
-          _9 = Len((*_2));
-          _10 = const 3_usize;
--         _11 = Eq(move _9, const 3_usize);
--         switchInt(move _11) -> [0: bb1, otherwise: bb2];
+          StorageLive(_3);
+          StorageLive(_4);
+          _4 = [_1, _1, _1];
+          _3 = &_4;
+          _2 = move _3 as &[T] (PointerCoercion(Unsize));
+          StorageDead(_3);
+          _8 = Len((*_2));
+          _9 = const 3_usize;
+-         _10 = Eq(move _8, const 3_usize);
+-         switchInt(move _10) -> [0: bb1, otherwise: bb2];
 +         nop;
-+         switchInt(move _9) -> [3: bb2, otherwise: bb1];
++         switchInt(move _8) -> [3: bb2, otherwise: bb1];
       }
   
       bb1: {
-          _15 = core::panicking::panic(const "internal error: entered unreachable code") -> unwind continue;
+          _11 = core::panicking::panic(const "internal error: entered unreachable code") -> unwind continue;
       }
   
       bb2: {
-          StorageDead(_5);
-          StorageDead(_2);
+          StorageDead(_4);
           return;
       }
   }
diff --git a/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-abort.mir b/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-abort.mir
index 787f9ee095f..9743e192462 100644
--- a/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-abort.mir
@@ -3,57 +3,53 @@
 fn num_to_digit(_1: char) -> u32 {
     debug num => _1;
     let mut _0: u32;
-    let mut _5: std::option::Option<u32>;
+    let mut _4: std::option::Option<u32>;
     scope 1 (inlined char::methods::<impl char>::is_digit) {
         debug self => _1;
         debug radix => const 8_u32;
         let _2: std::option::Option<u32>;
-        let mut _3: &std::option::Option<u32>;
         scope 2 (inlined Option::<u32>::is_some) {
-            debug self => _3;
-            let mut _4: isize;
+            debug self => &_2;
+            let mut _3: isize;
         }
     }
     scope 3 (inlined #[track_caller] Option::<u32>::unwrap) {
-        debug self => _5;
-        let mut _6: isize;
-        let mut _7: !;
+        debug self => _4;
+        let mut _5: isize;
+        let mut _6: !;
         scope 4 {
             debug val => _0;
         }
     }
 
     bb0: {
-        StorageLive(_3);
         StorageLive(_2);
         _2 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb1, unwind unreachable];
     }
 
     bb1: {
-        _3 = &_2;
-        _4 = discriminant((*_3));
-        StorageDead(_3);
+        _3 = discriminant(_2);
         StorageDead(_2);
-        switchInt(move _4) -> [1: bb2, otherwise: bb7];
+        switchInt(move _3) -> [1: bb2, otherwise: bb7];
     }
 
     bb2: {
-        StorageLive(_5);
-        _5 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb3, unwind unreachable];
+        StorageLive(_4);
+        _4 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb3, unwind unreachable];
     }
 
     bb3: {
-        _6 = discriminant(_5);
-        switchInt(move _6) -> [0: bb4, 1: bb5, otherwise: bb6];
+        _5 = discriminant(_4);
+        switchInt(move _5) -> [0: bb4, 1: bb5, otherwise: bb6];
     }
 
     bb4: {
-        _7 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind unreachable;
+        _6 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind unreachable;
     }
 
     bb5: {
-        _0 = move ((_5 as Some).0: u32);
-        StorageDead(_5);
+        _0 = move ((_4 as Some).0: u32);
+        StorageDead(_4);
         goto -> bb8;
     }
 
diff --git a/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-unwind.mir
index 43a1a1eed20..e89d6eb4d50 100644
--- a/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-unwind.mir
@@ -3,57 +3,53 @@
 fn num_to_digit(_1: char) -> u32 {
     debug num => _1;
     let mut _0: u32;
-    let mut _5: std::option::Option<u32>;
+    let mut _4: std::option::Option<u32>;
     scope 1 (inlined char::methods::<impl char>::is_digit) {
         debug self => _1;
         debug radix => const 8_u32;
         let _2: std::option::Option<u32>;
-        let mut _3: &std::option::Option<u32>;
         scope 2 (inlined Option::<u32>::is_some) {
-            debug self => _3;
-            let mut _4: isize;
+            debug self => &_2;
+            let mut _3: isize;
         }
     }
     scope 3 (inlined #[track_caller] Option::<u32>::unwrap) {
-        debug self => _5;
-        let mut _6: isize;
-        let mut _7: !;
+        debug self => _4;
+        let mut _5: isize;
+        let mut _6: !;
         scope 4 {
             debug val => _0;
         }
     }
 
     bb0: {
-        StorageLive(_3);
         StorageLive(_2);
         _2 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb1, unwind continue];
     }
 
     bb1: {
-        _3 = &_2;
-        _4 = discriminant((*_3));
-        StorageDead(_3);
+        _3 = discriminant(_2);
         StorageDead(_2);
-        switchInt(move _4) -> [1: bb2, otherwise: bb7];
+        switchInt(move _3) -> [1: bb2, otherwise: bb7];
     }
 
     bb2: {
-        StorageLive(_5);
-        _5 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb3, unwind continue];
+        StorageLive(_4);
+        _4 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb3, unwind continue];
     }
 
     bb3: {
-        _6 = discriminant(_5);
-        switchInt(move _6) -> [0: bb4, 1: bb5, otherwise: bb6];
+        _5 = discriminant(_4);
+        switchInt(move _5) -> [0: bb4, 1: bb5, otherwise: bb6];
     }
 
     bb4: {
-        _7 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind continue;
+        _6 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind continue;
     }
 
     bb5: {
-        _0 = move ((_5 as Some).0: u32);
-        StorageDead(_5);
+        _0 = move ((_4 as Some).0: u32);
+        StorageDead(_4);
         goto -> bb8;
     }
 
diff --git a/tests/mir-opt/pre-codegen/checked_ops.step_forward.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/checked_ops.step_forward.PreCodegen.after.mir
index 98c267e8e71..9be41bff3ca 100644
--- a/tests/mir-opt/pre-codegen/checked_ops.step_forward.PreCodegen.after.mir
+++ b/tests/mir-opt/pre-codegen/checked_ops.step_forward.PreCodegen.after.mir
@@ -8,42 +8,38 @@ fn step_forward(_1: u32, _2: usize) -> u32 {
         debug start => _1;
         debug n => _2;
         let _3: std::option::Option<u32>;
-        let mut _4: &std::option::Option<u32>;
-        let mut _7: bool;
-        let mut _8: u32;
+        let mut _6: bool;
+        let mut _7: u32;
         scope 2 {
         }
         scope 3 (inlined Option::<u32>::is_none) {
-            debug self => _4;
-            let mut _6: bool;
+            debug self => &_3;
+            let mut _5: bool;
             scope 4 (inlined Option::<u32>::is_some) {
-                debug self => _4;
-                let mut _5: isize;
+                debug self => &_3;
+                let mut _4: isize;
             }
         }
         scope 5 (inlined core::num::<impl u32>::wrapping_add) {
             debug self => _1;
-            debug rhs => _8;
+            debug rhs => _7;
         }
     }
 
     bb0: {
-        StorageLive(_7);
-        StorageLive(_4);
+        StorageLive(_6);
         StorageLive(_3);
         _3 = <u32 as Step>::forward_checked(_1, _2) -> [return: bb1, unwind continue];
     }
 
     bb1: {
-        _4 = &_3;
-        StorageLive(_6);
-        _5 = discriminant((*_4));
-        _6 = Eq(_5, const 1_isize);
-        _7 = Not(move _6);
-        StorageDead(_6);
+        StorageLive(_5);
+        _4 = discriminant(_3);
+        _5 = Eq(_4, const 1_isize);
+        _6 = Not(move _5);
+        StorageDead(_5);
         StorageDead(_3);
-        StorageDead(_4);
-        switchInt(move _7) -> [0: bb3, otherwise: bb2];
+        switchInt(move _6) -> [0: bb3, otherwise: bb2];
     }
 
     bb2: {
@@ -51,11 +47,11 @@ fn step_forward(_1: u32, _2: usize) -> u32 {
     }
 
     bb3: {
+        StorageDead(_6);
+        StorageLive(_7);
+        _7 = _2 as u32 (IntToInt);
+        _0 = Add(_1, _7);
         StorageDead(_7);
-        StorageLive(_8);
-        _8 = _2 as u32 (IntToInt);
-        _0 = Add(_1, _8);
-        StorageDead(_8);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/loops.filter_mapped.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/loops.filter_mapped.PreCodegen.after.mir
index 3b49cb711b7..07a57a7b578 100644
--- a/tests/mir-opt/pre-codegen/loops.filter_mapped.PreCodegen.after.mir
+++ b/tests/mir-opt/pre-codegen/loops.filter_mapped.PreCodegen.after.mir
@@ -7,20 +7,19 @@ fn filter_mapped(_1: impl Iterator<Item = T>, _2: impl Fn(T) -> Option<U>) -> ()
     let mut _3: std::iter::FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>>;
     let mut _4: std::iter::FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>>;
     let mut _5: std::iter::FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>>;
-    let mut _6: &mut std::iter::FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>>;
-    let mut _9: std::option::Option<U>;
-    let mut _10: isize;
-    let _12: ();
+    let mut _8: std::option::Option<U>;
+    let mut _9: isize;
+    let _11: ();
     scope 1 {
         debug iter => _5;
-        let _11: U;
+        let _10: U;
         scope 2 {
-            debug x => _11;
+            debug x => _10;
         }
         scope 4 (inlined <FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>> as Iterator>::next) {
-            debug self => _6;
-            let mut _7: &mut impl Iterator<Item = T>;
-            let mut _8: &mut impl Fn(T) -> Option<U>;
+            debug self => &_5;
+            let mut _6: &mut impl Iterator<Item = T>;
+            let mut _7: &mut impl Fn(T) -> Option<U>;
         }
     }
     scope 3 (inlined <FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>> as IntoIterator>::into_iter) {
@@ -42,24 +41,23 @@ fn filter_mapped(_1: impl Iterator<Item = T>, _2: impl Fn(T) -> Option<U>) -> ()
     }
 
     bb2: {
-        StorageLive(_9);
-        _6 = &mut _5;
-        StorageLive(_7);
-        _7 = &mut ((*_6).0: impl Iterator<Item = T>);
         StorageLive(_8);
-        _8 = &mut ((*_6).1: impl Fn(T) -> Option<U>);
-        _9 = <impl Iterator<Item = T> as Iterator>::find_map::<U, &mut impl Fn(T) -> Option<U>>(move _7, move _8) -> [return: bb3, unwind: bb9];
+        StorageLive(_6);
+        _6 = &mut (_5.0: impl Iterator<Item = T>);
+        StorageLive(_7);
+        _7 = &mut (_5.1: impl Fn(T) -> Option<U>);
+        _8 = <impl Iterator<Item = T> as Iterator>::find_map::<U, &mut impl Fn(T) -> Option<U>>(move _6, move _7) -> [return: bb3, unwind: bb9];
     }
 
     bb3: {
-        StorageDead(_8);
         StorageDead(_7);
-        _10 = discriminant(_9);
-        switchInt(move _10) -> [0: bb4, 1: bb6, otherwise: bb8];
+        StorageDead(_6);
+        _9 = discriminant(_8);
+        switchInt(move _9) -> [0: bb4, 1: bb6, otherwise: bb8];
     }
 
     bb4: {
-        StorageDead(_9);
+        StorageDead(_8);
         drop(_5) -> [return: bb5, unwind continue];
     }
 
@@ -70,12 +68,12 @@ fn filter_mapped(_1: impl Iterator<Item = T>, _2: impl Fn(T) -> Option<U>) -> ()
     }
 
     bb6: {
-        _11 = move ((_9 as Some).0: U);
-        _12 = opaque::<U>(move _11) -> [return: bb7, unwind: bb9];
+        _10 = move ((_8 as Some).0: U);
+        _11 = opaque::<U>(move _10) -> [return: bb7, unwind: bb9];
     }
 
     bb7: {
-        StorageDead(_9);
+        StorageDead(_8);
         goto -> bb2;
     }
 
diff --git a/tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir
index 40bb3a37c58..99dc9600e41 100644
--- a/tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir
+++ b/tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir
@@ -4,111 +4,95 @@ fn int_range(_1: usize, _2: usize) -> () {
     debug start => _1;
     debug end => _2;
     let mut _0: ();
-    let mut _3: std::ops::Range<usize>;
-    let mut _4: std::ops::Range<usize>;
-    let mut _5: &mut std::ops::Range<usize>;
-    let mut _11: std::option::Option<usize>;
-    let mut _14: isize;
-    let _16: ();
+    let mut _3: usize;
+    let mut _6: std::option::Option<usize>;
+    let mut _9: isize;
+    let _11: ();
     scope 1 {
-        debug iter => _4;
-        let _15: usize;
+        debug iter => std::ops::Range<usize>{ .0 => _3, .1 => _2, };
+        let _10: usize;
         scope 2 {
-            debug i => _15;
+            debug i => _10;
         }
         scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
-            debug self => _5;
+            debug self => &std::ops::Range<usize>{ .0 => _3, .1 => _2, };
             scope 5 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _5;
-                let mut _6: &usize;
-                let mut _7: &usize;
-                let mut _10: bool;
-                let _12: usize;
-                let mut _13: usize;
+                debug self => &std::ops::Range<usize>{ .0 => _3, .1 => _2, };
+                let mut _5: bool;
+                let _7: usize;
+                let mut _8: usize;
                 scope 6 {
-                    debug old => _12;
+                    debug old => _7;
                     scope 7 {
                     }
                 }
                 scope 8 (inlined cmp::impls::<impl PartialOrd for usize>::lt) {
-                    debug self => _6;
-                    debug other => _7;
-                    let mut _8: usize;
-                    let mut _9: usize;
+                    debug self => &_3;
+                    debug other => &_2;
+                    let mut _4: usize;
                 }
             }
         }
     }
     scope 3 (inlined <std::ops::Range<usize> as IntoIterator>::into_iter) {
-        debug self => _3;
+        debug self => std::ops::Range<usize>{ .0 => _1, .1 => _2, };
     }
 
     bb0: {
-        _3 = std::ops::Range::<usize> { start: _1, end: _2 };
-        StorageLive(_4);
-        _4 = move _3;
+        StorageLive(_3);
+        _3 = _1;
         goto -> bb1;
     }
 
     bb1: {
-        StorageLive(_11);
-        _5 = &mut _4;
-        StorageLive(_12);
-        StorageLive(_10);
         StorageLive(_6);
-        _6 = &((*_5).0: usize);
         StorageLive(_7);
-        _7 = &((*_5).1: usize);
-        StorageLive(_8);
-        _8 = (*_6);
-        StorageLive(_9);
-        _9 = (*_7);
-        _10 = Lt(move _8, move _9);
-        StorageDead(_9);
-        StorageDead(_8);
-        StorageDead(_7);
-        StorageDead(_6);
-        switchInt(move _10) -> [0: bb2, otherwise: bb3];
+        StorageLive(_5);
+        StorageLive(_4);
+        _4 = _3;
+        _5 = Lt(move _4, _2);
+        StorageDead(_4);
+        switchInt(move _5) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        _11 = Option::<usize>::None;
+        _6 = Option::<usize>::None;
         goto -> bb5;
     }
 
     bb3: {
-        _12 = ((*_5).0: usize);
-        StorageLive(_13);
-        _13 = <usize as Step>::forward_unchecked(_12, const 1_usize) -> [return: bb4, unwind continue];
+        _7 = _3;
+        StorageLive(_8);
+        _8 = <usize as Step>::forward_unchecked(_7, const 1_usize) -> [return: bb4, unwind continue];
     }
 
     bb4: {
-        ((*_5).0: usize) = move _13;
-        StorageDead(_13);
-        _11 = Option::<usize>::Some(_12);
+        _3 = move _8;
+        StorageDead(_8);
+        _6 = Option::<usize>::Some(_7);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_10);
-        StorageDead(_12);
-        _14 = discriminant(_11);
-        switchInt(move _14) -> [0: bb6, 1: bb7, otherwise: bb9];
+        StorageDead(_5);
+        StorageDead(_7);
+        _9 = discriminant(_6);
+        switchInt(move _9) -> [0: bb6, 1: bb7, otherwise: bb9];
     }
 
     bb6: {
-        StorageDead(_11);
-        StorageDead(_4);
+        StorageDead(_6);
+        StorageDead(_3);
         return;
     }
 
     bb7: {
-        _15 = ((_11 as Some).0: usize);
-        _16 = opaque::<usize>(_15) -> [return: bb8, unwind continue];
+        _10 = ((_6 as Some).0: usize);
+        _11 = opaque::<usize>(_10) -> [return: bb8, unwind continue];
     }
 
     bb8: {
-        StorageDead(_11);
+        StorageDead(_6);
         goto -> bb1;
     }
 
diff --git a/tests/mir-opt/pre-codegen/loops.mapped.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/loops.mapped.PreCodegen.after.mir
index e4e1d052e73..2614160363e 100644
--- a/tests/mir-opt/pre-codegen/loops.mapped.PreCodegen.after.mir
+++ b/tests/mir-opt/pre-codegen/loops.mapped.PreCodegen.after.mir
@@ -38,11 +38,13 @@ fn mapped(_1: impl Iterator<Item = T>, _2: impl Fn(T) -> U) -> () {
 
     bb2: {
         StorageLive(_7);
+        StorageLive(_6);
         _6 = &mut _5;
-        _7 = <Map<impl Iterator<Item = T>, impl Fn(T) -> U> as Iterator>::next(_6) -> [return: bb3, unwind: bb9];
+        _7 = <Map<impl Iterator<Item = T>, impl Fn(T) -> U> as Iterator>::next(move _6) -> [return: bb3, unwind: bb9];
     }
 
     bb3: {
+        StorageDead(_6);
         _8 = discriminant(_7);
         switchInt(move _8) -> [0: bb4, 1: bb6, otherwise: bb8];
     }
diff --git a/tests/mir-opt/pre-codegen/loops.vec_move.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/loops.vec_move.PreCodegen.after.mir
index 1b5f2a0884b..8eff46fb931 100644
--- a/tests/mir-opt/pre-codegen/loops.vec_move.PreCodegen.after.mir
+++ b/tests/mir-opt/pre-codegen/loops.vec_move.PreCodegen.after.mir
@@ -30,11 +30,13 @@ fn vec_move(_1: Vec<impl Sized>) -> () {
 
     bb2: {
         StorageLive(_5);
+        StorageLive(_4);
         _4 = &mut _3;
-        _5 = <std::vec::IntoIter<impl Sized> as Iterator>::next(_4) -> [return: bb3, unwind: bb9];
+        _5 = <std::vec::IntoIter<impl Sized> as Iterator>::next(move _4) -> [return: bb3, unwind: bb9];
     }
 
     bb3: {
+        StorageDead(_4);
         _6 = discriminant(_5);
         switchInt(move _6) -> [0: bb4, 1: bb6, otherwise: bb8];
     }
diff --git a/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir
index dde7a618881..eeb2e3a1b03 100644
--- a/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir
+++ b/tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir
@@ -7,26 +7,24 @@ fn mem_replace(_1: &mut u32, _2: u32) -> u32 {
     scope 1 (inlined std::mem::replace::<u32>) {
         debug dest => _1;
         debug src => _2;
-        let mut _3: *const u32;
-        let mut _4: *mut u32;
         scope 2 {
             scope 3 {
                 debug result => _0;
                 scope 7 (inlined std::ptr::write::<u32>) {
-                    debug dst => _4;
+                    debug dst => _1;
                     debug src => _2;
                     scope 8 {
                         scope 9 (inlined std::ptr::write::runtime::<u32>) {
-                            debug dst => _4;
+                            debug dst => _1;
                         }
                     }
                 }
             }
             scope 4 (inlined std::ptr::read::<u32>) {
-                debug src => _3;
+                debug src => _1;
                 scope 5 {
                     scope 6 (inlined std::ptr::read::runtime::<u32>) {
-                        debug src => _3;
+                        debug src => _1;
                     }
                 }
             }
@@ -34,14 +32,8 @@ fn mem_replace(_1: &mut u32, _2: u32) -> u32 {
     }
 
     bb0: {
-        StorageLive(_3);
-        _3 = &raw const (*_1);
-        _0 = (*_3);
-        StorageDead(_3);
-        StorageLive(_4);
-        _4 = &raw mut (*_1);
-        (*_4) = _2;
-        StorageDead(_4);
+        _0 = (*_1);
+        (*_1) = _2;
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-abort.mir
index 2344a3c0f83..cdaa3cfc995 100644
--- a/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-abort.mir
@@ -5,103 +5,87 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     debug end => _2;
     debug f => _3;
     let mut _0: ();
-    let mut _4: std::ops::Range<u32>;
-    let mut _5: std::ops::Range<u32>;
-    let mut _6: &mut std::ops::Range<u32>;
-    let mut _12: std::option::Option<u32>;
-    let mut _15: isize;
-    let mut _17: &impl Fn(u32);
-    let mut _18: (u32,);
-    let _19: ();
+    let mut _4: u32;
+    let mut _7: std::option::Option<u32>;
+    let mut _10: isize;
+    let mut _12: &impl Fn(u32);
+    let mut _13: (u32,);
+    let _14: ();
     scope 1 {
-        debug iter => _5;
-        let _16: u32;
+        debug iter => std::ops::Range<u32>{ .0 => _4, .1 => _2, };
+        let _11: u32;
         scope 2 {
-            debug x => _16;
+            debug x => _11;
         }
         scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<u32>>::next) {
-            debug self => _6;
+            debug self => &std::ops::Range<u32>{ .0 => _4, .1 => _2, };
             scope 5 (inlined <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _6;
-                let mut _7: &u32;
-                let mut _8: &u32;
-                let mut _11: bool;
-                let _13: u32;
-                let mut _14: u32;
+                debug self => &std::ops::Range<u32>{ .0 => _4, .1 => _2, };
+                let mut _6: bool;
+                let _8: u32;
+                let mut _9: u32;
                 scope 6 {
-                    debug old => _13;
+                    debug old => _8;
                     scope 7 {
                     }
                 }
                 scope 8 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                    debug self => _7;
-                    debug other => _8;
-                    let mut _9: u32;
-                    let mut _10: u32;
+                    debug self => &_4;
+                    debug other => &_2;
+                    let mut _5: u32;
                 }
             }
         }
     }
     scope 3 (inlined <std::ops::Range<u32> as IntoIterator>::into_iter) {
-        debug self => _4;
+        debug self => std::ops::Range<u32>{ .0 => _1, .1 => _2, };
     }
 
     bb0: {
-        _4 = std::ops::Range::<u32> { start: _1, end: _2 };
-        StorageLive(_5);
-        _5 = move _4;
+        StorageLive(_4);
+        _4 = _1;
         goto -> bb1;
     }
 
     bb1: {
-        StorageLive(_12);
-        _6 = &mut _5;
-        StorageLive(_13);
-        StorageLive(_11);
         StorageLive(_7);
-        _7 = &((*_6).0: u32);
         StorageLive(_8);
-        _8 = &((*_6).1: u32);
-        StorageLive(_9);
-        _9 = (*_7);
-        StorageLive(_10);
-        _10 = (*_8);
-        _11 = Lt(move _9, move _10);
-        StorageDead(_10);
-        StorageDead(_9);
-        StorageDead(_8);
-        StorageDead(_7);
-        switchInt(move _11) -> [0: bb2, otherwise: bb3];
+        StorageLive(_6);
+        StorageLive(_5);
+        _5 = _4;
+        _6 = Lt(move _5, _2);
+        StorageDead(_5);
+        switchInt(move _6) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        _12 = Option::<u32>::None;
+        _7 = Option::<u32>::None;
         goto -> bb5;
     }
 
     bb3: {
-        _13 = ((*_6).0: u32);
-        StorageLive(_14);
-        _14 = <u32 as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind unreachable];
+        _8 = _4;
+        StorageLive(_9);
+        _9 = <u32 as Step>::forward_unchecked(_8, const 1_usize) -> [return: bb4, unwind unreachable];
     }
 
     bb4: {
-        ((*_6).0: u32) = move _14;
-        StorageDead(_14);
-        _12 = Option::<u32>::Some(_13);
+        _4 = move _9;
+        StorageDead(_9);
+        _7 = Option::<u32>::Some(_8);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_11);
-        StorageDead(_13);
-        _15 = discriminant(_12);
-        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_6);
+        StorageDead(_8);
+        _10 = discriminant(_7);
+        switchInt(move _10) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_12);
-        StorageDead(_5);
+        StorageDead(_7);
+        StorageDead(_4);
         drop(_3) -> [return: bb7, unwind unreachable];
     }
 
@@ -110,18 +94,18 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     }
 
     bb8: {
-        _16 = ((_12 as Some).0: u32);
-        StorageLive(_17);
-        _17 = &_3;
-        StorageLive(_18);
-        _18 = (_16,);
-        _19 = <impl Fn(u32) as Fn<(u32,)>>::call(move _17, move _18) -> [return: bb9, unwind unreachable];
+        _11 = ((_7 as Some).0: u32);
+        StorageLive(_12);
+        _12 = &_3;
+        StorageLive(_13);
+        _13 = (_11,);
+        _14 = <impl Fn(u32) as Fn<(u32,)>>::call(move _12, move _13) -> [return: bb9, unwind unreachable];
     }
 
     bb9: {
-        StorageDead(_18);
-        StorageDead(_17);
+        StorageDead(_13);
         StorageDead(_12);
+        StorageDead(_7);
         goto -> bb1;
     }
 
diff --git a/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-unwind.mir
index fbe16dc3cd4..c4e56ea3b23 100644
--- a/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-unwind.mir
@@ -5,103 +5,87 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     debug end => _2;
     debug f => _3;
     let mut _0: ();
-    let mut _4: std::ops::Range<u32>;
-    let mut _5: std::ops::Range<u32>;
-    let mut _6: &mut std::ops::Range<u32>;
-    let mut _12: std::option::Option<u32>;
-    let mut _15: isize;
-    let mut _17: &impl Fn(u32);
-    let mut _18: (u32,);
-    let _19: ();
+    let mut _4: u32;
+    let mut _7: std::option::Option<u32>;
+    let mut _10: isize;
+    let mut _12: &impl Fn(u32);
+    let mut _13: (u32,);
+    let _14: ();
     scope 1 {
-        debug iter => _5;
-        let _16: u32;
+        debug iter => std::ops::Range<u32>{ .0 => _4, .1 => _2, };
+        let _11: u32;
         scope 2 {
-            debug x => _16;
+            debug x => _11;
         }
         scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<u32>>::next) {
-            debug self => _6;
+            debug self => &std::ops::Range<u32>{ .0 => _4, .1 => _2, };
             scope 5 (inlined <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _6;
-                let mut _7: &u32;
-                let mut _8: &u32;
-                let mut _11: bool;
-                let _13: u32;
-                let mut _14: u32;
+                debug self => &std::ops::Range<u32>{ .0 => _4, .1 => _2, };
+                let mut _6: bool;
+                let _8: u32;
+                let mut _9: u32;
                 scope 6 {
-                    debug old => _13;
+                    debug old => _8;
                     scope 7 {
                     }
                 }
                 scope 8 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                    debug self => _7;
-                    debug other => _8;
-                    let mut _9: u32;
-                    let mut _10: u32;
+                    debug self => &_4;
+                    debug other => &_2;
+                    let mut _5: u32;
                 }
             }
         }
     }
     scope 3 (inlined <std::ops::Range<u32> as IntoIterator>::into_iter) {
-        debug self => _4;
+        debug self => std::ops::Range<u32>{ .0 => _1, .1 => _2, };
     }
 
     bb0: {
-        _4 = std::ops::Range::<u32> { start: _1, end: _2 };
-        StorageLive(_5);
-        _5 = move _4;
+        StorageLive(_4);
+        _4 = _1;
         goto -> bb1;
     }
 
     bb1: {
-        StorageLive(_12);
-        _6 = &mut _5;
-        StorageLive(_13);
-        StorageLive(_11);
         StorageLive(_7);
-        _7 = &((*_6).0: u32);
         StorageLive(_8);
-        _8 = &((*_6).1: u32);
-        StorageLive(_9);
-        _9 = (*_7);
-        StorageLive(_10);
-        _10 = (*_8);
-        _11 = Lt(move _9, move _10);
-        StorageDead(_10);
-        StorageDead(_9);
-        StorageDead(_8);
-        StorageDead(_7);
-        switchInt(move _11) -> [0: bb2, otherwise: bb3];
+        StorageLive(_6);
+        StorageLive(_5);
+        _5 = _4;
+        _6 = Lt(move _5, _2);
+        StorageDead(_5);
+        switchInt(move _6) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        _12 = Option::<u32>::None;
+        _7 = Option::<u32>::None;
         goto -> bb5;
     }
 
     bb3: {
-        _13 = ((*_6).0: u32);
-        StorageLive(_14);
-        _14 = <u32 as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind: bb11];
+        _8 = _4;
+        StorageLive(_9);
+        _9 = <u32 as Step>::forward_unchecked(_8, const 1_usize) -> [return: bb4, unwind: bb11];
     }
 
     bb4: {
-        ((*_6).0: u32) = move _14;
-        StorageDead(_14);
-        _12 = Option::<u32>::Some(_13);
+        _4 = move _9;
+        StorageDead(_9);
+        _7 = Option::<u32>::Some(_8);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_11);
-        StorageDead(_13);
-        _15 = discriminant(_12);
-        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_6);
+        StorageDead(_8);
+        _10 = discriminant(_7);
+        switchInt(move _10) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_12);
-        StorageDead(_5);
+        StorageDead(_7);
+        StorageDead(_4);
         drop(_3) -> [return: bb7, unwind continue];
     }
 
@@ -110,18 +94,18 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     }
 
     bb8: {
-        _16 = ((_12 as Some).0: u32);
-        StorageLive(_17);
-        _17 = &_3;
-        StorageLive(_18);
-        _18 = (_16,);
-        _19 = <impl Fn(u32) as Fn<(u32,)>>::call(move _17, move _18) -> [return: bb9, unwind: bb11];
+        _11 = ((_7 as Some).0: u32);
+        StorageLive(_12);
+        _12 = &_3;
+        StorageLive(_13);
+        _13 = (_11,);
+        _14 = <impl Fn(u32) as Fn<(u32,)>>::call(move _12, move _13) -> [return: bb9, unwind: bb11];
     }
 
     bb9: {
-        StorageDead(_18);
-        StorageDead(_17);
+        StorageDead(_13);
         StorageDead(_12);
+        StorageDead(_7);
         goto -> bb1;
     }
 
diff --git a/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-abort.mir
index 9737c9a87c7..8d306858b43 100644
--- a/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-abort.mir
@@ -40,11 +40,13 @@ fn inclusive_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
 
     bb1: {
         StorageLive(_7);
+        StorageLive(_6);
         _6 = &mut _5;
         _7 = <RangeInclusive<u32> as iter::range::RangeInclusiveIteratorImpl>::spec_next(_6) -> [return: bb2, unwind unreachable];
     }
 
     bb2: {
+        StorageDead(_6);
         _8 = discriminant(_7);
         switchInt(move _8) -> [0: bb3, 1: bb5, otherwise: bb7];
     }
diff --git a/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-unwind.mir
index 04d6da1d9bd..e92c054c838 100644
--- a/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/range_iter.inclusive_loop.PreCodegen.after.panic-unwind.mir
@@ -40,11 +40,13 @@ fn inclusive_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
 
     bb1: {
         StorageLive(_7);
+        StorageLive(_6);
         _6 = &mut _5;
         _7 = <RangeInclusive<u32> as iter::range::RangeInclusiveIteratorImpl>::spec_next(_6) -> [return: bb2, unwind: bb8];
     }
 
     bb2: {
+        StorageDead(_6);
         _8 = discriminant(_7);
         switchInt(move _8) -> [0: bb3, 1: bb5, otherwise: bb7];
     }
diff --git a/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-abort.mir
index 1dfd00bf314..14fd049ede8 100644
--- a/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-abort.mir
@@ -7,42 +7,34 @@ fn range_iter_next(_1: &mut std::ops::Range<u32>) -> Option<u32> {
         debug self => _1;
         scope 2 (inlined <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next) {
             debug self => _1;
-            let mut _2: &u32;
-            let mut _3: &u32;
-            let mut _6: bool;
-            let _7: u32;
-            let mut _8: u32;
+            let mut _4: bool;
+            let _5: u32;
+            let mut _6: u32;
             scope 3 {
-                debug old => _7;
+                debug old => _5;
                 scope 4 {
                 }
             }
             scope 5 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                debug self => _2;
-                debug other => _3;
-                let mut _4: u32;
-                let mut _5: u32;
+                debug self => &((*_1).0: u32);
+                debug other => &((*_1).1: u32);
+                let mut _2: u32;
+                let mut _3: u32;
             }
         }
     }
 
     bb0: {
-        StorageLive(_7);
-        StorageLive(_6);
+        StorageLive(_5);
+        StorageLive(_4);
         StorageLive(_2);
-        _2 = &((*_1).0: u32);
+        _2 = ((*_1).0: u32);
         StorageLive(_3);
-        _3 = &((*_1).1: u32);
-        StorageLive(_4);
-        _4 = (*_2);
-        StorageLive(_5);
-        _5 = (*_3);
-        _6 = Lt(move _4, move _5);
-        StorageDead(_5);
-        StorageDead(_4);
+        _3 = ((*_1).1: u32);
+        _4 = Lt(move _2, move _3);
         StorageDead(_3);
         StorageDead(_2);
-        switchInt(move _6) -> [0: bb1, otherwise: bb2];
+        switchInt(move _4) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
@@ -51,21 +43,21 @@ fn range_iter_next(_1: &mut std::ops::Range<u32>) -> Option<u32> {
     }
 
     bb2: {
-        _7 = ((*_1).0: u32);
-        StorageLive(_8);
-        _8 = <u32 as Step>::forward_unchecked(_7, const 1_usize) -> [return: bb3, unwind unreachable];
+        _5 = ((*_1).0: u32);
+        StorageLive(_6);
+        _6 = <u32 as Step>::forward_unchecked(_5, const 1_usize) -> [return: bb3, unwind unreachable];
     }
 
     bb3: {
-        ((*_1).0: u32) = move _8;
-        StorageDead(_8);
-        _0 = Option::<u32>::Some(_7);
+        ((*_1).0: u32) = move _6;
+        StorageDead(_6);
+        _0 = Option::<u32>::Some(_5);
         goto -> bb4;
     }
 
     bb4: {
-        StorageDead(_6);
-        StorageDead(_7);
+        StorageDead(_4);
+        StorageDead(_5);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-unwind.mir
index 65870f693c0..668a2ac1e20 100644
--- a/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-unwind.mir
@@ -7,42 +7,34 @@ fn range_iter_next(_1: &mut std::ops::Range<u32>) -> Option<u32> {
         debug self => _1;
         scope 2 (inlined <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next) {
             debug self => _1;
-            let mut _2: &u32;
-            let mut _3: &u32;
-            let mut _6: bool;
-            let _7: u32;
-            let mut _8: u32;
+            let mut _4: bool;
+            let _5: u32;
+            let mut _6: u32;
             scope 3 {
-                debug old => _7;
+                debug old => _5;
                 scope 4 {
                 }
             }
             scope 5 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                debug self => _2;
-                debug other => _3;
-                let mut _4: u32;
-                let mut _5: u32;
+                debug self => &((*_1).0: u32);
+                debug other => &((*_1).1: u32);
+                let mut _2: u32;
+                let mut _3: u32;
             }
         }
     }
 
     bb0: {
-        StorageLive(_7);
-        StorageLive(_6);
+        StorageLive(_5);
+        StorageLive(_4);
         StorageLive(_2);
-        _2 = &((*_1).0: u32);
+        _2 = ((*_1).0: u32);
         StorageLive(_3);
-        _3 = &((*_1).1: u32);
-        StorageLive(_4);
-        _4 = (*_2);
-        StorageLive(_5);
-        _5 = (*_3);
-        _6 = Lt(move _4, move _5);
-        StorageDead(_5);
-        StorageDead(_4);
+        _3 = ((*_1).1: u32);
+        _4 = Lt(move _2, move _3);
         StorageDead(_3);
         StorageDead(_2);
-        switchInt(move _6) -> [0: bb1, otherwise: bb2];
+        switchInt(move _4) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
@@ -51,21 +43,21 @@ fn range_iter_next(_1: &mut std::ops::Range<u32>) -> Option<u32> {
     }
 
     bb2: {
-        _7 = ((*_1).0: u32);
-        StorageLive(_8);
-        _8 = <u32 as Step>::forward_unchecked(_7, const 1_usize) -> [return: bb3, unwind continue];
+        _5 = ((*_1).0: u32);
+        StorageLive(_6);
+        _6 = <u32 as Step>::forward_unchecked(_5, const 1_usize) -> [return: bb3, unwind continue];
     }
 
     bb3: {
-        ((*_1).0: u32) = move _8;
-        StorageDead(_8);
-        _0 = Option::<u32>::Some(_7);
+        ((*_1).0: u32) = move _6;
+        StorageDead(_6);
+        _0 = Option::<u32>::Some(_5);
         goto -> bb4;
     }
 
     bb4: {
-        StorageDead(_6);
-        StorageDead(_7);
+        StorageDead(_4);
+        StorageDead(_5);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/slice_filter.variant_a-{closure#0}.PreCodegen.after.mir b/tests/mir-opt/pre-codegen/slice_filter.variant_a-{closure#0}.PreCodegen.after.mir
index 499bee2ae40..f9b0c85c852 100644
--- a/tests/mir-opt/pre-codegen/slice_filter.variant_a-{closure#0}.PreCodegen.after.mir
+++ b/tests/mir-opt/pre-codegen/slice_filter.variant_a-{closure#0}.PreCodegen.after.mir
@@ -3,214 +3,138 @@
 fn variant_a::{closure#0}(_1: &mut [closure@$DIR/slice_filter.rs:7:25: 7:39], _2: &&(usize, usize, usize, usize)) -> bool {
     let mut _0: bool;
     let mut _3: &(usize, usize, usize, usize);
-    let _4: &usize;
+    let mut _4: &(usize, usize, usize, usize);
     let mut _5: &(usize, usize, usize, usize);
-    let _6: &usize;
-    let mut _7: &(usize, usize, usize, usize);
-    let _8: &usize;
-    let mut _9: &(usize, usize, usize, usize);
-    let _10: &usize;
-    let mut _11: &&usize;
-    let _12: &usize;
-    let mut _13: &&usize;
-    let mut _18: bool;
-    let mut _19: bool;
-    let mut _20: &&usize;
-    let _21: &usize;
-    let mut _22: &&usize;
-    let mut _27: bool;
-    let mut _28: &&usize;
-    let _29: &usize;
-    let mut _30: &&usize;
-    let mut _35: bool;
-    let mut _36: bool;
-    let mut _37: &&usize;
-    let _38: &usize;
-    let mut _39: &&usize;
-    let mut _44: bool;
+    let mut _6: &(usize, usize, usize, usize);
+    let mut _9: bool;
+    let mut _10: bool;
+    let mut _13: bool;
+    let mut _16: bool;
+    let mut _17: bool;
+    let mut _20: bool;
     scope 1 {
-        debug a => _4;
-        debug b => _6;
-        debug c => _8;
-        debug d => _10;
+        debug a => &((*_3).0: usize);
+        debug b => &((*_4).1: usize);
+        debug c => &((*_5).2: usize);
+        debug d => &((*_6).3: usize);
         scope 2 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _11;
-            debug other => _13;
-            let mut _14: &usize;
-            let mut _15: &usize;
+            debug self => &&((*_3).0: usize);
+            debug other => &&((*_5).2: usize);
             scope 3 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
-                debug self => _14;
-                debug other => _15;
-                let mut _16: usize;
-                let mut _17: usize;
+                debug self => &((*_3).0: usize);
+                debug other => &((*_5).2: usize);
+                let mut _7: usize;
+                let mut _8: usize;
             }
         }
         scope 4 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _28;
-            debug other => _30;
-            let mut _31: &usize;
-            let mut _32: &usize;
+            debug self => &&((*_5).2: usize);
+            debug other => &&((*_3).0: usize);
             scope 5 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
-                debug self => _31;
-                debug other => _32;
-                let mut _33: usize;
-                let mut _34: usize;
+                debug self => &((*_5).2: usize);
+                debug other => &((*_3).0: usize);
+                let mut _14: usize;
+                let mut _15: usize;
             }
         }
         scope 6 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _20;
-            debug other => _22;
-            let mut _23: &usize;
-            let mut _24: &usize;
+            debug self => &&((*_6).3: usize);
+            debug other => &&((*_4).1: usize);
             scope 7 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
-                debug self => _23;
-                debug other => _24;
-                let mut _25: usize;
-                let mut _26: usize;
+                debug self => &((*_6).3: usize);
+                debug other => &((*_4).1: usize);
+                let mut _11: usize;
+                let mut _12: usize;
             }
         }
         scope 8 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _37;
-            debug other => _39;
-            let mut _40: &usize;
-            let mut _41: &usize;
+            debug self => &&((*_4).1: usize);
+            debug other => &&((*_6).3: usize);
             scope 9 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
-                debug self => _40;
-                debug other => _41;
-                let mut _42: usize;
-                let mut _43: usize;
+                debug self => &((*_4).1: usize);
+                debug other => &((*_6).3: usize);
+                let mut _18: usize;
+                let mut _19: usize;
             }
         }
     }
 
     bb0: {
-        StorageLive(_4);
         _3 = deref_copy (*_2);
-        _4 = &((*_3).0: usize);
-        StorageLive(_6);
+        _4 = deref_copy (*_2);
         _5 = deref_copy (*_2);
-        _6 = &((*_5).1: usize);
-        StorageLive(_8);
-        _7 = deref_copy (*_2);
-        _8 = &((*_7).2: usize);
+        _6 = deref_copy (*_2);
         StorageLive(_10);
-        _9 = deref_copy (*_2);
-        _10 = &((*_9).3: usize);
-        StorageLive(_19);
-        StorageLive(_18);
-        StorageLive(_11);
-        _11 = &_4;
-        StorageLive(_13);
-        StorageLive(_12);
-        _12 = _8;
-        _13 = &_12;
-        _14 = deref_copy (*_11);
-        _15 = deref_copy (*_13);
-        StorageLive(_16);
-        _16 = (*_14);
-        StorageLive(_17);
-        _17 = (*_15);
-        _18 = Le(move _16, move _17);
-        StorageDead(_17);
-        StorageDead(_16);
-        StorageDead(_12);
-        StorageDead(_13);
-        StorageDead(_11);
-        switchInt(move _18) -> [0: bb1, otherwise: bb2];
+        StorageLive(_9);
+        StorageLive(_7);
+        _7 = ((*_3).0: usize);
+        StorageLive(_8);
+        _8 = ((*_5).2: usize);
+        _9 = Le(move _7, move _8);
+        StorageDead(_8);
+        StorageDead(_7);
+        switchInt(move _9) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
-        _19 = const false;
+        _10 = const false;
         goto -> bb3;
     }
 
     bb2: {
-        StorageLive(_27);
-        StorageLive(_20);
-        _20 = &_10;
-        StorageLive(_22);
-        StorageLive(_21);
-        _21 = _6;
-        _22 = &_21;
-        _23 = deref_copy (*_20);
-        _24 = deref_copy (*_22);
-        StorageLive(_25);
-        _25 = (*_23);
-        StorageLive(_26);
-        _26 = (*_24);
-        _27 = Le(move _25, move _26);
-        StorageDead(_26);
-        StorageDead(_25);
-        StorageDead(_21);
-        StorageDead(_22);
-        StorageDead(_20);
-        _19 = move _27;
+        StorageLive(_13);
+        StorageLive(_11);
+        _11 = ((*_6).3: usize);
+        StorageLive(_12);
+        _12 = ((*_4).1: usize);
+        _13 = Le(move _11, move _12);
+        StorageDead(_12);
+        StorageDead(_11);
+        _10 = move _13;
         goto -> bb3;
     }
 
     bb3: {
-        StorageDead(_27);
-        StorageDead(_18);
-        switchInt(move _19) -> [0: bb4, otherwise: bb8];
+        StorageDead(_13);
+        StorageDead(_9);
+        switchInt(move _10) -> [0: bb4, otherwise: bb8];
     }
 
     bb4: {
-        StorageLive(_36);
-        StorageLive(_35);
-        StorageLive(_28);
-        _28 = &_8;
-        StorageLive(_30);
-        StorageLive(_29);
-        _29 = _4;
-        _30 = &_29;
-        _31 = deref_copy (*_28);
-        _32 = deref_copy (*_30);
-        StorageLive(_33);
-        _33 = (*_31);
-        StorageLive(_34);
-        _34 = (*_32);
-        _35 = Le(move _33, move _34);
-        StorageDead(_34);
-        StorageDead(_33);
-        StorageDead(_29);
-        StorageDead(_30);
-        StorageDead(_28);
-        switchInt(move _35) -> [0: bb5, otherwise: bb6];
+        StorageLive(_17);
+        StorageLive(_16);
+        StorageLive(_14);
+        _14 = ((*_5).2: usize);
+        StorageLive(_15);
+        _15 = ((*_3).0: usize);
+        _16 = Le(move _14, move _15);
+        StorageDead(_15);
+        StorageDead(_14);
+        switchInt(move _16) -> [0: bb5, otherwise: bb6];
     }
 
     bb5: {
-        _36 = const false;
+        _17 = const false;
         goto -> bb7;
     }
 
     bb6: {
-        StorageLive(_44);
-        StorageLive(_37);
-        _37 = &_6;
-        StorageLive(_39);
-        StorageLive(_38);
-        _38 = _10;
-        _39 = &_38;
-        _40 = deref_copy (*_37);
-        _41 = deref_copy (*_39);
-        StorageLive(_42);
-        _42 = (*_40);
-        StorageLive(_43);
-        _43 = (*_41);
-        _44 = Le(move _42, move _43);
-        StorageDead(_43);
-        StorageDead(_42);
-        StorageDead(_38);
-        StorageDead(_39);
-        StorageDead(_37);
-        _36 = move _44;
+        StorageLive(_20);
+        StorageLive(_18);
+        _18 = ((*_4).1: usize);
+        StorageLive(_19);
+        _19 = ((*_6).3: usize);
+        _20 = Le(move _18, move _19);
+        StorageDead(_19);
+        StorageDead(_18);
+        _17 = move _20;
         goto -> bb7;
     }
 
     bb7: {
-        StorageDead(_44);
-        StorageDead(_35);
-        _0 = move _36;
+        StorageDead(_20);
+        StorageDead(_16);
+        _0 = move _17;
         goto -> bb9;
     }
 
@@ -220,12 +144,8 @@ fn variant_a::{closure#0}(_1: &mut [closure@$DIR/slice_filter.rs:7:25: 7:39], _2
     }
 
     bb9: {
-        StorageDead(_36);
-        StorageDead(_19);
+        StorageDead(_17);
         StorageDead(_10);
-        StorageDead(_8);
-        StorageDead(_6);
-        StorageDead(_4);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-abort.mir
index 65416d09053..07a58309ee4 100644
--- a/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-abort.mir
@@ -10,38 +10,37 @@ fn slice_get_mut_usize(_1: &mut [u32], _2: usize) -> Option<&mut u32> {
         scope 2 (inlined <usize as SliceIndex<[u32]>>::get_mut) {
             debug self => _2;
             debug slice => _1;
-            let mut _3: &[u32];
-            let mut _4: usize;
-            let mut _5: bool;
-            let mut _6: *mut [u32];
-            let mut _8: *mut u32;
-            let mut _9: &mut u32;
+            let mut _3: usize;
+            let mut _4: bool;
+            let mut _5: *mut [u32];
+            let mut _7: *mut u32;
+            let mut _8: &mut u32;
             scope 3 {
                 scope 4 (inlined <usize as SliceIndex<[u32]>>::get_unchecked_mut) {
                     debug self => _2;
-                    debug slice => _6;
-                    let mut _7: *mut u32;
+                    debug slice => _5;
+                    let mut _6: *mut u32;
                     scope 5 {
                         debug this => _2;
                         scope 6 {
                             scope 7 (inlined <usize as SliceIndex<[T]>>::get_unchecked_mut::runtime::<u32>) {
                                 debug this => _2;
-                                debug slice => _6;
+                                debug slice => _5;
                                 scope 8 (inlined ptr::mut_ptr::<impl *mut [u32]>::len) {
-                                    debug self => _6;
-                                    let mut _10: *const [u32];
+                                    debug self => _5;
+                                    let mut _9: *const [u32];
                                     scope 9 (inlined std::ptr::metadata::<[u32]>) {
-                                        debug ptr => _10;
+                                        debug ptr => _9;
                                         scope 10 {
                                         }
                                     }
                                 }
                             }
                             scope 11 (inlined ptr::mut_ptr::<impl *mut [u32]>::as_mut_ptr) {
-                                debug self => _6;
+                                debug self => _5;
                             }
                             scope 12 (inlined ptr::mut_ptr::<impl *mut u32>::add) {
-                                debug self => _7;
+                                debug self => _6;
                                 debug count => _2;
                                 scope 13 {
                                 }
@@ -54,16 +53,13 @@ fn slice_get_mut_usize(_1: &mut [u32], _2: usize) -> Option<&mut u32> {
     }
 
     bb0: {
-        StorageLive(_9);
-        StorageLive(_5);
+        StorageLive(_7);
         StorageLive(_4);
         StorageLive(_3);
-        _3 = &(*_1);
-        _4 = Len((*_3));
+        _3 = Len((*_1));
+        _4 = Lt(_2, move _3);
         StorageDead(_3);
-        _5 = Lt(_2, move _4);
-        StorageDead(_4);
-        switchInt(move _5) -> [0: bb1, otherwise: bb2];
+        switchInt(move _4) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
@@ -73,24 +69,24 @@ fn slice_get_mut_usize(_1: &mut [u32], _2: usize) -> Option<&mut u32> {
 
     bb2: {
         StorageLive(_8);
+        StorageLive(_5);
+        _5 = &raw mut (*_1);
+        StorageLive(_9);
         StorageLive(_6);
-        _6 = &raw mut (*_1);
-        StorageLive(_10);
-        StorageLive(_7);
-        _7 = _6 as *mut u32 (PtrToPtr);
-        _8 = Offset(_7, _2);
-        StorageDead(_7);
-        StorageDead(_10);
+        _6 = _5 as *mut u32 (PtrToPtr);
+        _7 = Offset(_6, _2);
         StorageDead(_6);
-        _9 = &mut (*_8);
-        _0 = Option::<&mut u32>::Some(_9);
+        StorageDead(_9);
+        StorageDead(_5);
+        _8 = &mut (*_7);
+        _0 = Option::<&mut u32>::Some(move _8);
         StorageDead(_8);
         goto -> bb3;
     }
 
     bb3: {
-        StorageDead(_5);
-        StorageDead(_9);
+        StorageDead(_4);
+        StorageDead(_7);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-unwind.mir
index 65416d09053..07a58309ee4 100644
--- a/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/slice_index.slice_get_mut_usize.PreCodegen.after.panic-unwind.mir
@@ -10,38 +10,37 @@ fn slice_get_mut_usize(_1: &mut [u32], _2: usize) -> Option<&mut u32> {
         scope 2 (inlined <usize as SliceIndex<[u32]>>::get_mut) {
             debug self => _2;
             debug slice => _1;
-            let mut _3: &[u32];
-            let mut _4: usize;
-            let mut _5: bool;
-            let mut _6: *mut [u32];
-            let mut _8: *mut u32;
-            let mut _9: &mut u32;
+            let mut _3: usize;
+            let mut _4: bool;
+            let mut _5: *mut [u32];
+            let mut _7: *mut u32;
+            let mut _8: &mut u32;
             scope 3 {
                 scope 4 (inlined <usize as SliceIndex<[u32]>>::get_unchecked_mut) {
                     debug self => _2;
-                    debug slice => _6;
-                    let mut _7: *mut u32;
+                    debug slice => _5;
+                    let mut _6: *mut u32;
                     scope 5 {
                         debug this => _2;
                         scope 6 {
                             scope 7 (inlined <usize as SliceIndex<[T]>>::get_unchecked_mut::runtime::<u32>) {
                                 debug this => _2;
-                                debug slice => _6;
+                                debug slice => _5;
                                 scope 8 (inlined ptr::mut_ptr::<impl *mut [u32]>::len) {
-                                    debug self => _6;
-                                    let mut _10: *const [u32];
+                                    debug self => _5;
+                                    let mut _9: *const [u32];
                                     scope 9 (inlined std::ptr::metadata::<[u32]>) {
-                                        debug ptr => _10;
+                                        debug ptr => _9;
                                         scope 10 {
                                         }
                                     }
                                 }
                             }
                             scope 11 (inlined ptr::mut_ptr::<impl *mut [u32]>::as_mut_ptr) {
-                                debug self => _6;
+                                debug self => _5;
                             }
                             scope 12 (inlined ptr::mut_ptr::<impl *mut u32>::add) {
-                                debug self => _7;
+                                debug self => _6;
                                 debug count => _2;
                                 scope 13 {
                                 }
@@ -54,16 +53,13 @@ fn slice_get_mut_usize(_1: &mut [u32], _2: usize) -> Option<&mut u32> {
     }
 
     bb0: {
-        StorageLive(_9);
-        StorageLive(_5);
+        StorageLive(_7);
         StorageLive(_4);
         StorageLive(_3);
-        _3 = &(*_1);
-        _4 = Len((*_3));
+        _3 = Len((*_1));
+        _4 = Lt(_2, move _3);
         StorageDead(_3);
-        _5 = Lt(_2, move _4);
-        StorageDead(_4);
-        switchInt(move _5) -> [0: bb1, otherwise: bb2];
+        switchInt(move _4) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
@@ -73,24 +69,24 @@ fn slice_get_mut_usize(_1: &mut [u32], _2: usize) -> Option<&mut u32> {
 
     bb2: {
         StorageLive(_8);
+        StorageLive(_5);
+        _5 = &raw mut (*_1);
+        StorageLive(_9);
         StorageLive(_6);
-        _6 = &raw mut (*_1);
-        StorageLive(_10);
-        StorageLive(_7);
-        _7 = _6 as *mut u32 (PtrToPtr);
-        _8 = Offset(_7, _2);
-        StorageDead(_7);
-        StorageDead(_10);
+        _6 = _5 as *mut u32 (PtrToPtr);
+        _7 = Offset(_6, _2);
         StorageDead(_6);
-        _9 = &mut (*_8);
-        _0 = Option::<&mut u32>::Some(_9);
+        StorageDead(_9);
+        StorageDead(_5);
+        _8 = &mut (*_7);
+        _0 = Option::<&mut u32>::Some(move _8);
         StorageDead(_8);
         goto -> bb3;
     }
 
     bb3: {
-        StorageDead(_5);
-        StorageDead(_9);
+        StorageDead(_4);
+        StorageDead(_7);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir
index e07e2bb7bfe..2f5d356a26d 100644
--- a/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir
@@ -61,7 +61,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
     bb0: {
         _3 = move (_2.0: usize);
         _4 = move (_2.1: usize);
-        StorageLive(_13);
         StorageLive(_5);
         _5 = &raw mut (*_1);
         StorageLive(_14);
@@ -92,7 +91,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         StorageDead(_15);
         StorageDead(_5);
         _0 = &mut (*_13);
-        StorageDead(_13);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir
index e07e2bb7bfe..2f5d356a26d 100644
--- a/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir
@@ -61,7 +61,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
     bb0: {
         _3 = move (_2.0: usize);
         _4 = move (_2.1: usize);
-        StorageLive(_13);
         StorageLive(_5);
         _5 = &raw mut (*_1);
         StorageLive(_14);
@@ -92,7 +91,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         StorageDead(_15);
         StorageDead(_5);
         _0 = &mut (*_13);
-        StorageDead(_13);
         return;
     }
 }
diff --git a/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-abort.mir
index d1ab16697a6..2cf81d86267 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-abort.mir
@@ -152,11 +152,13 @@ fn enumerated_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
 
     bb4: {
         StorageLive(_17);
+        StorageLive(_16);
         _16 = &mut _15;
-        _17 = <Enumerate<std::slice::Iter<'_, T>> as Iterator>::next(_16) -> [return: bb5, unwind unreachable];
+        _17 = <Enumerate<std::slice::Iter<'_, T>> as Iterator>::next(move _16) -> [return: bb5, unwind unreachable];
     }
 
     bb5: {
+        StorageDead(_16);
         _18 = discriminant(_17);
         switchInt(move _18) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
diff --git a/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-unwind.mir
index 03751f7fdf7..6985806ec93 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.enumerated_loop.PreCodegen.after.panic-unwind.mir
@@ -152,11 +152,13 @@ fn enumerated_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
 
     bb4: {
         StorageLive(_17);
+        StorageLive(_16);
         _16 = &mut _15;
-        _17 = <Enumerate<std::slice::Iter<'_, T>> as Iterator>::next(_16) -> [return: bb5, unwind: bb11];
+        _17 = <Enumerate<std::slice::Iter<'_, T>> as Iterator>::next(move _16) -> [return: bb5, unwind: bb11];
     }
 
     bb5: {
+        StorageDead(_16);
         _18 = discriminant(_17);
         switchInt(move _18) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
diff --git a/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-abort.mir
index db971e10f32..a4b8460e98e 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-abort.mir
@@ -140,11 +140,13 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
 
     bb4: {
         StorageLive(_16);
+        StorageLive(_15);
         _15 = &mut _14;
-        _16 = <std::slice::Iter<'_, T> as Iterator>::next(_15) -> [return: bb5, unwind unreachable];
+        _16 = <std::slice::Iter<'_, T> as Iterator>::next(move _15) -> [return: bb5, unwind unreachable];
     }
 
     bb5: {
+        StorageDead(_15);
         _17 = discriminant(_16);
         switchInt(move _17) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
diff --git a/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-unwind.mir
index 74597799168..58f312b1aac 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.forward_loop.PreCodegen.after.panic-unwind.mir
@@ -140,11 +140,13 @@ fn forward_loop(_1: &[T], _2: impl Fn(&T)) -> () {
 
     bb4: {
         StorageLive(_16);
+        StorageLive(_15);
         _15 = &mut _14;
-        _16 = <std::slice::Iter<'_, T> as Iterator>::next(_15) -> [return: bb5, unwind: bb11];
+        _16 = <std::slice::Iter<'_, T> as Iterator>::next(move _15) -> [return: bb5, unwind: bb11];
     }
 
     bb5: {
+        StorageDead(_15);
         _17 = discriminant(_16);
         switchInt(move _17) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
diff --git a/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-abort.mir
index 00177033bbf..901381f070b 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-abort.mir
@@ -5,112 +5,95 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     debug f => _2;
     let mut _0: ();
     let mut _3: usize;
-    let mut _4: std::ops::Range<usize>;
-    let mut _5: std::ops::Range<usize>;
-    let mut _6: &mut std::ops::Range<usize>;
-    let mut _12: std::option::Option<usize>;
-    let mut _15: isize;
-    let mut _17: usize;
-    let mut _18: bool;
-    let mut _20: &impl Fn(usize, &T);
-    let mut _21: (usize, &T);
-    let _22: ();
+    let mut _4: usize;
+    let mut _7: std::option::Option<usize>;
+    let mut _10: isize;
+    let mut _12: usize;
+    let mut _13: bool;
+    let mut _15: &impl Fn(usize, &T);
+    let mut _16: (usize, &T);
+    let _17: ();
+    let mut _18: usize;
     scope 1 {
-        debug iter => _5;
-        let _16: usize;
+        debug iter => std::ops::Range<usize>{ .0 => _4, .1 => _3, };
+        let _11: usize;
         scope 2 {
-            debug i => _16;
-            let _19: &T;
+            debug i => _11;
+            let _14: &T;
             scope 3 {
-                debug x => _19;
+                debug x => _14;
             }
         }
         scope 5 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
-            debug self => _6;
+            debug self => &std::ops::Range<usize>{ .0 => _4, .1 => _3, };
             scope 6 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _6;
-                let mut _7: &usize;
-                let mut _8: &usize;
-                let mut _11: bool;
-                let _13: usize;
-                let mut _14: usize;
+                debug self => &std::ops::Range<usize>{ .0 => _4, .1 => _3, };
+                let mut _6: bool;
+                let _8: usize;
+                let mut _9: usize;
                 scope 7 {
-                    debug old => _13;
+                    debug old => _8;
                     scope 8 {
                     }
                 }
                 scope 9 (inlined cmp::impls::<impl PartialOrd for usize>::lt) {
-                    debug self => _7;
-                    debug other => _8;
-                    let mut _9: usize;
-                    let mut _10: usize;
+                    debug self => &_4;
+                    debug other => &_3;
+                    let mut _5: usize;
                 }
             }
         }
     }
     scope 4 (inlined <std::ops::Range<usize> as IntoIterator>::into_iter) {
-        debug self => _4;
+        debug self => std::ops::Range<usize>{ .0 => _18, .1 => _3, };
     }
 
     bb0: {
-        StorageLive(_3);
         _3 = Len((*_1));
-        _4 = std::ops::Range::<usize> { start: const 0_usize, end: move _3 };
-        StorageDead(_3);
-        StorageLive(_5);
-        _5 = move _4;
+        StorageLive(_4);
+        _4 = const 0_usize;
         goto -> bb1;
     }
 
     bb1: {
-        StorageLive(_12);
-        _6 = &mut _5;
-        StorageLive(_13);
-        StorageLive(_11);
         StorageLive(_7);
-        _7 = &((*_6).0: usize);
         StorageLive(_8);
-        _8 = &((*_6).1: usize);
-        StorageLive(_9);
-        _9 = (*_7);
-        StorageLive(_10);
-        _10 = (*_8);
-        _11 = Lt(move _9, move _10);
-        StorageDead(_10);
-        StorageDead(_9);
-        StorageDead(_8);
-        StorageDead(_7);
-        switchInt(move _11) -> [0: bb2, otherwise: bb3];
+        StorageLive(_6);
+        StorageLive(_5);
+        _5 = _4;
+        _6 = Lt(move _5, _3);
+        StorageDead(_5);
+        switchInt(move _6) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        _12 = Option::<usize>::None;
+        _7 = Option::<usize>::None;
         goto -> bb5;
     }
 
     bb3: {
-        _13 = ((*_6).0: usize);
-        StorageLive(_14);
-        _14 = <usize as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind unreachable];
+        _8 = _4;
+        StorageLive(_9);
+        _9 = <usize as Step>::forward_unchecked(_8, const 1_usize) -> [return: bb4, unwind unreachable];
     }
 
     bb4: {
-        ((*_6).0: usize) = move _14;
-        StorageDead(_14);
-        _12 = Option::<usize>::Some(_13);
+        _4 = move _9;
+        StorageDead(_9);
+        _7 = Option::<usize>::Some(_8);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_11);
-        StorageDead(_13);
-        _15 = discriminant(_12);
-        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb11];
+        StorageDead(_6);
+        StorageDead(_8);
+        _10 = discriminant(_7);
+        switchInt(move _10) -> [0: bb6, 1: bb8, otherwise: bb11];
     }
 
     bb6: {
-        StorageDead(_12);
-        StorageDead(_5);
+        StorageDead(_7);
+        StorageDead(_4);
         drop(_2) -> [return: bb7, unwind unreachable];
     }
 
@@ -119,25 +102,25 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     }
 
     bb8: {
-        _16 = ((_12 as Some).0: usize);
-        _17 = Len((*_1));
-        _18 = Lt(_16, _17);
-        assert(move _18, "index out of bounds: the length is {} but the index is {}", move _17, _16) -> [success: bb9, unwind unreachable];
+        _11 = ((_7 as Some).0: usize);
+        _12 = Len((*_1));
+        _13 = Lt(_11, _12);
+        assert(move _13, "index out of bounds: the length is {} but the index is {}", move _12, _11) -> [success: bb9, unwind unreachable];
     }
 
     bb9: {
-        _19 = &(*_1)[_16];
-        StorageLive(_20);
-        _20 = &_2;
-        StorageLive(_21);
-        _21 = (_16, _19);
-        _22 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _20, move _21) -> [return: bb10, unwind unreachable];
+        _14 = &(*_1)[_11];
+        StorageLive(_15);
+        _15 = &_2;
+        StorageLive(_16);
+        _16 = (_11, _14);
+        _17 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _15, move _16) -> [return: bb10, unwind unreachable];
     }
 
     bb10: {
-        StorageDead(_21);
-        StorageDead(_20);
-        StorageDead(_12);
+        StorageDead(_16);
+        StorageDead(_15);
+        StorageDead(_7);
         goto -> bb1;
     }
 
diff --git a/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-unwind.mir
index 3423c5d865d..a47a73395cf 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-unwind.mir
@@ -5,112 +5,95 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     debug f => _2;
     let mut _0: ();
     let mut _3: usize;
-    let mut _4: std::ops::Range<usize>;
-    let mut _5: std::ops::Range<usize>;
-    let mut _6: &mut std::ops::Range<usize>;
-    let mut _12: std::option::Option<usize>;
-    let mut _15: isize;
-    let mut _17: usize;
-    let mut _18: bool;
-    let mut _20: &impl Fn(usize, &T);
-    let mut _21: (usize, &T);
-    let _22: ();
+    let mut _4: usize;
+    let mut _7: std::option::Option<usize>;
+    let mut _10: isize;
+    let mut _12: usize;
+    let mut _13: bool;
+    let mut _15: &impl Fn(usize, &T);
+    let mut _16: (usize, &T);
+    let _17: ();
+    let mut _18: usize;
     scope 1 {
-        debug iter => _5;
-        let _16: usize;
+        debug iter => std::ops::Range<usize>{ .0 => _4, .1 => _3, };
+        let _11: usize;
         scope 2 {
-            debug i => _16;
-            let _19: &T;
+            debug i => _11;
+            let _14: &T;
             scope 3 {
-                debug x => _19;
+                debug x => _14;
             }
         }
         scope 5 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
-            debug self => _6;
+            debug self => &std::ops::Range<usize>{ .0 => _4, .1 => _3, };
             scope 6 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _6;
-                let mut _7: &usize;
-                let mut _8: &usize;
-                let mut _11: bool;
-                let _13: usize;
-                let mut _14: usize;
+                debug self => &std::ops::Range<usize>{ .0 => _4, .1 => _3, };
+                let mut _6: bool;
+                let _8: usize;
+                let mut _9: usize;
                 scope 7 {
-                    debug old => _13;
+                    debug old => _8;
                     scope 8 {
                     }
                 }
                 scope 9 (inlined cmp::impls::<impl PartialOrd for usize>::lt) {
-                    debug self => _7;
-                    debug other => _8;
-                    let mut _9: usize;
-                    let mut _10: usize;
+                    debug self => &_4;
+                    debug other => &_3;
+                    let mut _5: usize;
                 }
             }
         }
     }
     scope 4 (inlined <std::ops::Range<usize> as IntoIterator>::into_iter) {
-        debug self => _4;
+        debug self => std::ops::Range<usize>{ .0 => _18, .1 => _3, };
     }
 
     bb0: {
-        StorageLive(_3);
         _3 = Len((*_1));
-        _4 = std::ops::Range::<usize> { start: const 0_usize, end: move _3 };
-        StorageDead(_3);
-        StorageLive(_5);
-        _5 = move _4;
+        StorageLive(_4);
+        _4 = const 0_usize;
         goto -> bb1;
     }
 
     bb1: {
-        StorageLive(_12);
-        _6 = &mut _5;
-        StorageLive(_13);
-        StorageLive(_11);
         StorageLive(_7);
-        _7 = &((*_6).0: usize);
         StorageLive(_8);
-        _8 = &((*_6).1: usize);
-        StorageLive(_9);
-        _9 = (*_7);
-        StorageLive(_10);
-        _10 = (*_8);
-        _11 = Lt(move _9, move _10);
-        StorageDead(_10);
-        StorageDead(_9);
-        StorageDead(_8);
-        StorageDead(_7);
-        switchInt(move _11) -> [0: bb2, otherwise: bb3];
+        StorageLive(_6);
+        StorageLive(_5);
+        _5 = _4;
+        _6 = Lt(move _5, _3);
+        StorageDead(_5);
+        switchInt(move _6) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        _12 = Option::<usize>::None;
+        _7 = Option::<usize>::None;
         goto -> bb5;
     }
 
     bb3: {
-        _13 = ((*_6).0: usize);
-        StorageLive(_14);
-        _14 = <usize as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind: bb12];
+        _8 = _4;
+        StorageLive(_9);
+        _9 = <usize as Step>::forward_unchecked(_8, const 1_usize) -> [return: bb4, unwind: bb12];
     }
 
     bb4: {
-        ((*_6).0: usize) = move _14;
-        StorageDead(_14);
-        _12 = Option::<usize>::Some(_13);
+        _4 = move _9;
+        StorageDead(_9);
+        _7 = Option::<usize>::Some(_8);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_11);
-        StorageDead(_13);
-        _15 = discriminant(_12);
-        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb11];
+        StorageDead(_6);
+        StorageDead(_8);
+        _10 = discriminant(_7);
+        switchInt(move _10) -> [0: bb6, 1: bb8, otherwise: bb11];
     }
 
     bb6: {
-        StorageDead(_12);
-        StorageDead(_5);
+        StorageDead(_7);
+        StorageDead(_4);
         drop(_2) -> [return: bb7, unwind continue];
     }
 
@@ -119,25 +102,25 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     }
 
     bb8: {
-        _16 = ((_12 as Some).0: usize);
-        _17 = Len((*_1));
-        _18 = Lt(_16, _17);
-        assert(move _18, "index out of bounds: the length is {} but the index is {}", move _17, _16) -> [success: bb9, unwind: bb12];
+        _11 = ((_7 as Some).0: usize);
+        _12 = Len((*_1));
+        _13 = Lt(_11, _12);
+        assert(move _13, "index out of bounds: the length is {} but the index is {}", move _12, _11) -> [success: bb9, unwind: bb12];
     }
 
     bb9: {
-        _19 = &(*_1)[_16];
-        StorageLive(_20);
-        _20 = &_2;
-        StorageLive(_21);
-        _21 = (_16, _19);
-        _22 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _20, move _21) -> [return: bb10, unwind: bb12];
+        _14 = &(*_1)[_11];
+        StorageLive(_15);
+        _15 = &_2;
+        StorageLive(_16);
+        _16 = (_11, _14);
+        _17 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _15, move _16) -> [return: bb10, unwind: bb12];
     }
 
     bb10: {
-        StorageDead(_21);
-        StorageDead(_20);
-        StorageDead(_12);
+        StorageDead(_16);
+        StorageDead(_15);
+        StorageDead(_7);
         goto -> bb1;
     }
 
diff --git a/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-abort.mir
index e546140e0c1..b550711aa41 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-abort.mir
@@ -7,21 +7,20 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     let mut _13: std::slice::Iter<'_, T>;
     let mut _14: std::iter::Rev<std::slice::Iter<'_, T>>;
     let mut _15: std::iter::Rev<std::slice::Iter<'_, T>>;
-    let mut _16: &mut std::iter::Rev<std::slice::Iter<'_, T>>;
-    let mut _18: std::option::Option<&T>;
-    let mut _19: isize;
-    let mut _21: &impl Fn(&T);
-    let mut _22: (&T,);
-    let _23: ();
+    let mut _17: std::option::Option<&T>;
+    let mut _18: isize;
+    let mut _20: &impl Fn(&T);
+    let mut _21: (&T,);
+    let _22: ();
     scope 1 {
         debug iter => _15;
-        let _20: &T;
+        let _19: &T;
         scope 2 {
-            debug x => _20;
+            debug x => _19;
         }
         scope 25 (inlined <Rev<std::slice::Iter<'_, T>> as Iterator>::next) {
-            debug self => _16;
-            let mut _17: &mut std::slice::Iter<'_, T>;
+            debug self => &_15;
+            let mut _16: &mut std::slice::Iter<'_, T>;
         }
     }
     scope 3 (inlined core::slice::<impl [T]>::iter) {
@@ -49,15 +48,15 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
                                     debug ptr => _9;
                                     scope 16 (inlined ptr::mut_ptr::<impl *mut T>::is_null) {
                                         debug self => _9;
-                                        let mut _24: *mut u8;
+                                        let mut _23: *mut u8;
                                         scope 17 {
                                             scope 18 (inlined ptr::mut_ptr::<impl *mut T>::is_null::runtime_impl) {
-                                                debug ptr => _24;
+                                                debug ptr => _23;
                                                 scope 19 (inlined ptr::mut_ptr::<impl *mut u8>::addr) {
-                                                    debug self => _24;
+                                                    debug self => _23;
                                                     scope 20 {
                                                         scope 21 (inlined ptr::mut_ptr::<impl *mut u8>::cast::<()>) {
-                                                            debug self => _24;
+                                                            debug self => _23;
                                                         }
                                                     }
                                                 }
@@ -132,10 +131,10 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
         StorageLive(_9);
         _9 = _4 as *mut T (PtrToPtr);
         StorageLive(_10);
-        StorageLive(_24);
+        StorageLive(_23);
         _10 = _9 as *const T (PointerCoercion(MutToConstPointer));
         _11 = NonNull::<T> { pointer: _10 };
-        StorageDead(_24);
+        StorageDead(_23);
         StorageDead(_10);
         StorageDead(_9);
         StorageLive(_12);
@@ -153,21 +152,20 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb4: {
-        StorageLive(_18);
-        _16 = &mut _15;
         StorageLive(_17);
-        _17 = &mut ((*_16).0: std::slice::Iter<'_, T>);
-        _18 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _17) -> [return: bb5, unwind unreachable];
+        StorageLive(_16);
+        _16 = &mut (_15.0: std::slice::Iter<'_, T>);
+        _17 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _16) -> [return: bb5, unwind unreachable];
     }
 
     bb5: {
-        StorageDead(_17);
-        _19 = discriminant(_18);
-        switchInt(move _19) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_16);
+        _18 = discriminant(_17);
+        switchInt(move _18) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_18);
+        StorageDead(_17);
         StorageDead(_15);
         drop(_2) -> [return: bb7, unwind unreachable];
     }
@@ -177,18 +175,18 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb8: {
-        _20 = ((_18 as Some).0: &T);
+        _19 = ((_17 as Some).0: &T);
+        StorageLive(_20);
+        _20 = &_2;
         StorageLive(_21);
-        _21 = &_2;
-        StorageLive(_22);
-        _22 = (_20,);
-        _23 = <impl Fn(&T) as Fn<(&T,)>>::call(move _21, move _22) -> [return: bb9, unwind unreachable];
+        _21 = (_19,);
+        _22 = <impl Fn(&T) as Fn<(&T,)>>::call(move _20, move _21) -> [return: bb9, unwind unreachable];
     }
 
     bb9: {
-        StorageDead(_22);
         StorageDead(_21);
-        StorageDead(_18);
+        StorageDead(_20);
+        StorageDead(_17);
         goto -> bb4;
     }
 
diff --git a/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-unwind.mir
index 551cac46bdf..23444241cd2 100644
--- a/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-unwind.mir
@@ -7,21 +7,20 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     let mut _13: std::slice::Iter<'_, T>;
     let mut _14: std::iter::Rev<std::slice::Iter<'_, T>>;
     let mut _15: std::iter::Rev<std::slice::Iter<'_, T>>;
-    let mut _16: &mut std::iter::Rev<std::slice::Iter<'_, T>>;
-    let mut _18: std::option::Option<&T>;
-    let mut _19: isize;
-    let mut _21: &impl Fn(&T);
-    let mut _22: (&T,);
-    let _23: ();
+    let mut _17: std::option::Option<&T>;
+    let mut _18: isize;
+    let mut _20: &impl Fn(&T);
+    let mut _21: (&T,);
+    let _22: ();
     scope 1 {
         debug iter => _15;
-        let _20: &T;
+        let _19: &T;
         scope 2 {
-            debug x => _20;
+            debug x => _19;
         }
         scope 25 (inlined <Rev<std::slice::Iter<'_, T>> as Iterator>::next) {
-            debug self => _16;
-            let mut _17: &mut std::slice::Iter<'_, T>;
+            debug self => &_15;
+            let mut _16: &mut std::slice::Iter<'_, T>;
         }
     }
     scope 3 (inlined core::slice::<impl [T]>::iter) {
@@ -49,15 +48,15 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
                                     debug ptr => _9;
                                     scope 16 (inlined ptr::mut_ptr::<impl *mut T>::is_null) {
                                         debug self => _9;
-                                        let mut _24: *mut u8;
+                                        let mut _23: *mut u8;
                                         scope 17 {
                                             scope 18 (inlined ptr::mut_ptr::<impl *mut T>::is_null::runtime_impl) {
-                                                debug ptr => _24;
+                                                debug ptr => _23;
                                                 scope 19 (inlined ptr::mut_ptr::<impl *mut u8>::addr) {
-                                                    debug self => _24;
+                                                    debug self => _23;
                                                     scope 20 {
                                                         scope 21 (inlined ptr::mut_ptr::<impl *mut u8>::cast::<()>) {
-                                                            debug self => _24;
+                                                            debug self => _23;
                                                         }
                                                     }
                                                 }
@@ -132,10 +131,10 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
         StorageLive(_9);
         _9 = _4 as *mut T (PtrToPtr);
         StorageLive(_10);
-        StorageLive(_24);
+        StorageLive(_23);
         _10 = _9 as *const T (PointerCoercion(MutToConstPointer));
         _11 = NonNull::<T> { pointer: _10 };
-        StorageDead(_24);
+        StorageDead(_23);
         StorageDead(_10);
         StorageDead(_9);
         StorageLive(_12);
@@ -153,21 +152,20 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb4: {
-        StorageLive(_18);
-        _16 = &mut _15;
         StorageLive(_17);
-        _17 = &mut ((*_16).0: std::slice::Iter<'_, T>);
-        _18 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _17) -> [return: bb5, unwind: bb11];
+        StorageLive(_16);
+        _16 = &mut (_15.0: std::slice::Iter<'_, T>);
+        _17 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _16) -> [return: bb5, unwind: bb11];
     }
 
     bb5: {
-        StorageDead(_17);
-        _19 = discriminant(_18);
-        switchInt(move _19) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_16);
+        _18 = discriminant(_17);
+        switchInt(move _18) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_18);
+        StorageDead(_17);
         StorageDead(_15);
         drop(_2) -> [return: bb7, unwind continue];
     }
@@ -177,18 +175,18 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb8: {
-        _20 = ((_18 as Some).0: &T);
+        _19 = ((_17 as Some).0: &T);
+        StorageLive(_20);
+        _20 = &_2;
         StorageLive(_21);
-        _21 = &_2;
-        StorageLive(_22);
-        _22 = (_20,);
-        _23 = <impl Fn(&T) as Fn<(&T,)>>::call(move _21, move _22) -> [return: bb9, unwind: bb11];
+        _21 = (_19,);
+        _22 = <impl Fn(&T) as Fn<(&T,)>>::call(move _20, move _21) -> [return: bb9, unwind: bb11];
     }
 
     bb9: {
-        StorageDead(_22);
         StorageDead(_21);
-        StorageDead(_18);
+        StorageDead(_20);
+        StorageDead(_17);
         goto -> bb4;
     }
 
diff --git a/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-abort.mir b/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-abort.mir
index b9329520bab..ed7107e53ef 100644
--- a/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-abort.mir
+++ b/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-abort.mir
@@ -3,17 +3,19 @@
 fn outer(_1: u8) -> u8 {
     debug v => _1;                       // in scope 0 at $DIR/spans.rs:10:14: 10:15
     let mut _0: u8;                      // return place in scope 0 at $DIR/spans.rs:10:24: 10:26
-    let _2: &u8;                         // in scope 0 at $DIR/spans.rs:11:11: 11:13
+    let mut _2: &u8;                     // in scope 0 at $DIR/spans.rs:11:11: 11:13
 
     bb0: {
+        StorageLive(_2);                 // scope 0 at $DIR/spans.rs:11:11: 11:13
         _2 = &_1;                        // scope 0 at $DIR/spans.rs:11:11: 11:13
-        _0 = inner(_2) -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/spans.rs:11:5: 11:14
+        _0 = inner(move _2) -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/spans.rs:11:5: 11:14
                                          // mir::Constant
                                          // + span: $DIR/spans.rs:11:5: 11:10
                                          // + literal: Const { ty: for<'a> fn(&'a u8) -> u8 {inner}, val: Value(<ZST>) }
     }
 
     bb1: {
+        StorageDead(_2);                 // scope 0 at $DIR/spans.rs:11:13: 11:14
         return;                          // scope 0 at $DIR/spans.rs:12:2: 12:2
     }
 }
diff --git a/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-unwind.mir b/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-unwind.mir
index 1e20b1be56b..dc436dc2650 100644
--- a/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-unwind.mir
+++ b/tests/mir-opt/pre-codegen/spans.outer.PreCodegen.after.panic-unwind.mir
@@ -3,17 +3,19 @@
 fn outer(_1: u8) -> u8 {
     debug v => _1;                       // in scope 0 at $DIR/spans.rs:10:14: 10:15
     let mut _0: u8;                      // return place in scope 0 at $DIR/spans.rs:10:24: 10:26
-    let _2: &u8;                         // in scope 0 at $DIR/spans.rs:11:11: 11:13
+    let mut _2: &u8;                     // in scope 0 at $DIR/spans.rs:11:11: 11:13
 
     bb0: {
+        StorageLive(_2);                 // scope 0 at $DIR/spans.rs:11:11: 11:13
         _2 = &_1;                        // scope 0 at $DIR/spans.rs:11:11: 11:13
-        _0 = inner(_2) -> [return: bb1, unwind continue]; // scope 0 at $DIR/spans.rs:11:5: 11:14
+        _0 = inner(move _2) -> [return: bb1, unwind continue]; // scope 0 at $DIR/spans.rs:11:5: 11:14
                                          // mir::Constant
                                          // + span: $DIR/spans.rs:11:5: 11:10
                                          // + literal: Const { ty: for<'a> fn(&'a u8) -> u8 {inner}, val: Value(<ZST>) }
     }
 
     bb1: {
+        StorageDead(_2);                 // scope 0 at $DIR/spans.rs:11:13: 11:14
         return;                          // scope 0 at $DIR/spans.rs:12:2: 12:2
     }
 }