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-rw-r--r--compiler/rustc_index/src/bit_set.rs8
-rw-r--r--compiler/rustc_mir_dataflow/src/debuginfo.rs20
-rw-r--r--compiler/rustc_mir_dataflow/src/lib.rs1
-rw-r--r--compiler/rustc_mir_transform/src/dead_store_elimination.rs22
-rw-r--r--tests/incremental/hashes/for_loops.rs6
-rw-r--r--tests/incremental/hashes/loop_expressions.rs4
-rw-r--r--tests/incremental/hashes/while_loops.rs10
-rw-r--r--tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.diff29
-rw-r--r--tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-abort.diff73
-rw-r--r--tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-unwind.diff73
-rw-r--r--tests/mir-opt/dead-store-elimination/cycle.rs37
-rw-r--r--tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-abort.mir7
-rw-r--r--tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-unwind.mir7
-rw-r--r--tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-abort.diff2
-rw-r--r--tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-unwind.diff2
-rw-r--r--tests/mir-opt/issue_101973.inner.ConstProp.panic-abort.diff1
-rw-r--r--tests/mir-opt/issue_101973.inner.ConstProp.panic-unwind.diff1
-rw-r--r--tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-abort.mir45
-rw-r--r--tests/mir-opt/issues/issue_59352.num_to_digit.PreCodegen.after.panic-unwind.mir45
-rw-r--r--tests/mir-opt/pre-codegen/checked_ops.step_forward.PreCodegen.after.mir45
-rw-r--r--tests/mir-opt/pre-codegen/loops.filter_mapped.PreCodegen.after.mir43
-rw-r--r--tests/mir-opt/pre-codegen/loops.int_range.PreCodegen.after.mir99
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-abort.mir115
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.forward_loop.PreCodegen.after.panic-unwind.mir115
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-abort.mir64
-rw-r--r--tests/mir-opt/pre-codegen/range_iter.range_iter_next.PreCodegen.after.panic-unwind.mir64
-rw-r--r--tests/mir-opt/pre-codegen/slice_filter.variant_a-{closure#0}.PreCodegen.after.mir256
-rw-r--r--tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir14
-rw-r--r--tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir14
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-abort.mir131
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.range_loop.PreCodegen.after.panic-unwind.mir131
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-abort.mir49
-rw-r--r--tests/mir-opt/pre-codegen/slice_iter.reverse_loop.PreCodegen.after.panic-unwind.mir49
33 files changed, 774 insertions, 808 deletions
diff --git a/compiler/rustc_index/src/bit_set.rs b/compiler/rustc_index/src/bit_set.rs
index 12a7ecf8133..ece61ff1252 100644
--- a/compiler/rustc_index/src/bit_set.rs
+++ b/compiler/rustc_index/src/bit_set.rs
@@ -365,7 +365,7 @@ impl<T: Idx> From<GrowableBitSet<T>> for BitSet<T> {
 /// All operations that involve an element will panic if the element is equal
 /// to or greater than the domain size. All operations that involve two bitsets
 /// will panic if the bitsets have differing domain sizes.
-#[derive(Debug, PartialEq, Eq)]
+#[derive(PartialEq, Eq)]
 pub struct ChunkedBitSet<T> {
     domain_size: usize,
 
@@ -1074,6 +1074,12 @@ impl<T: Idx> fmt::Debug for BitSet<T> {
     }
 }
 
+impl<T: Idx> fmt::Debug for ChunkedBitSet<T> {
+    fn fmt(&self, w: &mut fmt::Formatter<'_>) -> fmt::Result {
+        w.debug_list().entries(self.iter()).finish()
+    }
+}
+
 impl<T: Idx> ToString for BitSet<T> {
     fn to_string(&self) -> String {
         let mut result = String::new();
diff --git a/compiler/rustc_mir_dataflow/src/debuginfo.rs b/compiler/rustc_mir_dataflow/src/debuginfo.rs
new file mode 100644
index 00000000000..fd5e8cf2955
--- /dev/null
+++ b/compiler/rustc_mir_dataflow/src/debuginfo.rs
@@ -0,0 +1,20 @@
+use rustc_index::bit_set::BitSet;
+use rustc_middle::mir::visit::*;
+use rustc_middle::mir::*;
+
+/// Return the set of locals that appear in debuginfo.
+pub fn debuginfo_locals(body: &Body<'_>) -> BitSet<Local> {
+    let mut visitor = DebuginfoLocals(BitSet::new_empty(body.local_decls.len()));
+    for debuginfo in body.var_debug_info.iter() {
+        visitor.visit_var_debug_info(debuginfo);
+    }
+    visitor.0
+}
+
+struct DebuginfoLocals(BitSet<Local>);
+
+impl Visitor<'_> for DebuginfoLocals {
+    fn visit_local(&mut self, local: Local, _: PlaceContext, _: Location) {
+        self.0.insert(local);
+    }
+}
diff --git a/compiler/rustc_mir_dataflow/src/lib.rs b/compiler/rustc_mir_dataflow/src/lib.rs
index 0cdbee19d2c..ecf46715cd0 100644
--- a/compiler/rustc_mir_dataflow/src/lib.rs
+++ b/compiler/rustc_mir_dataflow/src/lib.rs
@@ -35,6 +35,7 @@ pub use self::framework::{
 
 use self::move_paths::MoveData;
 
+pub mod debuginfo;
 pub mod drop_flag_effects;
 pub mod elaborate_drops;
 mod errors;
diff --git a/compiler/rustc_mir_transform/src/dead_store_elimination.rs b/compiler/rustc_mir_transform/src/dead_store_elimination.rs
index ef14105041b..3d74ef7e327 100644
--- a/compiler/rustc_mir_transform/src/dead_store_elimination.rs
+++ b/compiler/rustc_mir_transform/src/dead_store_elimination.rs
@@ -13,10 +13,10 @@
 //!
 
 use crate::util::is_within_packed;
-use rustc_index::bit_set::BitSet;
 use rustc_middle::mir::visit::Visitor;
 use rustc_middle::mir::*;
 use rustc_middle::ty::TyCtxt;
+use rustc_mir_dataflow::debuginfo::debuginfo_locals;
 use rustc_mir_dataflow::impls::{
     borrowed_locals, LivenessTransferFunction, MaybeTransitiveLiveLocals,
 };
@@ -26,8 +26,15 @@ use rustc_mir_dataflow::Analysis;
 ///
 /// The `borrowed` set must be a `BitSet` of all the locals that are ever borrowed in this body. It
 /// can be generated via the [`borrowed_locals`] function.
-pub fn eliminate<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, borrowed: &BitSet<Local>) {
-    let mut live = MaybeTransitiveLiveLocals::new(borrowed)
+pub fn eliminate<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
+    let borrowed_locals = borrowed_locals(body);
+
+    // If the user requests complete debuginfo, mark the locals that appear in it as live, so
+    // we don't remove assignements to them.
+    let mut always_live = debuginfo_locals(body);
+    always_live.union(&borrowed_locals);
+
+    let mut live = MaybeTransitiveLiveLocals::new(&always_live)
         .into_engine(tcx, body)
         .iterate_to_fixpoint()
         .into_results_cursor(body);
@@ -48,7 +55,9 @@ pub fn eliminate<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, borrowed: &BitS
             for (index, arg) in args.iter().enumerate().rev() {
                 if let Operand::Copy(place) = *arg
                     && !place.is_indirect()
-                    && !borrowed.contains(place.local)
+                    // Do not skip the transformation if the local is in debuginfo, as we do
+                    // not really lose any information for this purpose.
+                    && !borrowed_locals.contains(place.local)
                     && !state.contains(place.local)
                     // If `place` is a projection of a disaligned field in a packed ADT,
                     // the move may be codegened as a pointer to that field.
@@ -75,7 +84,7 @@ pub fn eliminate<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, borrowed: &BitS
                 StatementKind::Assign(box (place, _))
                 | StatementKind::SetDiscriminant { place: box place, .. }
                 | StatementKind::Deinit(box place) => {
-                    if !place.is_indirect() && !borrowed.contains(place.local) {
+                    if !place.is_indirect() && !always_live.contains(place.local) {
                         live.seek_before_primary_effect(loc);
                         if !live.get().contains(place.local) {
                             patch.push(loc);
@@ -126,7 +135,6 @@ impl<'tcx> MirPass<'tcx> for DeadStoreElimination {
     }
 
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
-        let borrowed = borrowed_locals(body);
-        eliminate(tcx, body, &borrowed);
+        eliminate(tcx, body);
     }
 }
diff --git a/tests/incremental/hashes/for_loops.rs b/tests/incremental/hashes/for_loops.rs
index 193e792c843..98c762e4097 100644
--- a/tests/incremental/hashes/for_loops.rs
+++ b/tests/incremental/hashes/for_loops.rs
@@ -28,9 +28,9 @@ pub fn change_loop_body() {
 }
 
 #[cfg(not(any(cfail1,cfail4)))]
-#[rustc_clean(cfg="cfail2", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail2", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail3")]
-#[rustc_clean(cfg="cfail5", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail5", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail6")]
 pub fn change_loop_body() {
     let mut _x = 0;
@@ -180,7 +180,7 @@ pub fn add_loop_label_to_break() {
 #[cfg(not(any(cfail1,cfail4)))]
 #[rustc_clean(cfg="cfail2", except="hir_owner_nodes")]
 #[rustc_clean(cfg="cfail3")]
-#[rustc_clean(cfg="cfail5", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail5", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail6")]
 pub fn add_loop_label_to_break() {
     let mut _x = 0;
diff --git a/tests/incremental/hashes/loop_expressions.rs b/tests/incremental/hashes/loop_expressions.rs
index 87b86479d07..13e37bd59f8 100644
--- a/tests/incremental/hashes/loop_expressions.rs
+++ b/tests/incremental/hashes/loop_expressions.rs
@@ -28,9 +28,9 @@ pub fn change_loop_body() {
 }
 
 #[cfg(not(any(cfail1,cfail4)))]
-#[rustc_clean(cfg="cfail2", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail2", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail3")]
-#[rustc_clean(cfg="cfail5", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail5", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail6")]
 pub fn change_loop_body() {
     let mut _x = 0;
diff --git a/tests/incremental/hashes/while_loops.rs b/tests/incremental/hashes/while_loops.rs
index c1cc0b62bc2..077d76fdd43 100644
--- a/tests/incremental/hashes/while_loops.rs
+++ b/tests/incremental/hashes/while_loops.rs
@@ -28,9 +28,9 @@ pub fn change_loop_body() {
 }
 
 #[cfg(not(any(cfail1,cfail4)))]
-#[rustc_clean(cfg="cfail2", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail2", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail3")]
-#[rustc_clean(cfg="cfail5", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail5", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail6")]
 pub fn change_loop_body() {
     let mut _x = 0;
@@ -53,9 +53,9 @@ pub fn change_loop_condition() {
 }
 
 #[cfg(not(any(cfail1,cfail4)))]
-#[rustc_clean(cfg="cfail2", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail2", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail3")]
-#[rustc_clean(cfg="cfail5", except="hir_owner_nodes")]
+#[rustc_clean(cfg="cfail5", except="hir_owner_nodes, optimized_mir")]
 #[rustc_clean(cfg="cfail6")]
 pub fn change_loop_condition() {
     let mut _x = 0;
@@ -211,7 +211,7 @@ pub fn change_continue_label() {
 #[cfg(not(any(cfail1,cfail4)))]
 #[rustc_clean(cfg="cfail2", except="hir_owner_nodes")]
 #[rustc_clean(cfg="cfail3")]
-#[rustc_clean(cfg="cfail5", except="hir_owner_nodes,optimized_mir")]
+#[rustc_clean(cfg="cfail5", except="hir_owner_nodes")]
 #[rustc_clean(cfg="cfail6")]
 pub fn change_continue_label() {
     let mut _x = 0;
diff --git a/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.diff b/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.diff
new file mode 100644
index 00000000000..cf73358dc52
--- /dev/null
+++ b/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.diff
@@ -0,0 +1,29 @@
+- // MIR for `cycle` before DeadStoreElimination
++ // MIR for `cycle` after DeadStoreElimination
+  
+  fn cycle(_1: i32, _2: i32, _3: i32) -> () {
+      let mut _0: ();
+      let mut _4: bool;
+-     let mut _5: i32;
+  
+      bb0: {
+          _4 = cond() -> [return: bb1, unwind continue];
+      }
+  
+      bb1: {
+          switchInt(_4) -> [1: bb2, otherwise: bb3];
+      }
+  
+      bb2: {
+-         _5 = _3;
+-         _3 = _2;
+-         _2 = _1;
+-         _1 = _5;
+          _4 = cond() -> [return: bb1, unwind continue];
+      }
+  
+      bb3: {
+          return;
+      }
+  }
+  
diff --git a/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-abort.diff b/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-abort.diff
deleted file mode 100644
index 6221d478041..00000000000
--- a/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-abort.diff
+++ /dev/null
@@ -1,73 +0,0 @@
-- // MIR for `cycle` before DeadStoreElimination
-+ // MIR for `cycle` after DeadStoreElimination
-  
-  fn cycle(_1: i32, _2: i32, _3: i32) -> () {
-      debug x => _1;
-      debug y => _2;
-      debug z => _3;
-      let mut _0: ();
--     let mut _4: ();
--     let mut _5: bool;
--     let _6: i32;
--     let mut _7: i32;
--     let mut _8: i32;
--     let mut _9: i32;
--     let mut _10: !;
--     let _11: ();
--     let mut _12: !;
-+     let mut _4: bool;
-+     let _5: i32;
-      scope 1 {
--         debug temp => _6;
-+         debug temp => _5;
-      }
-  
-      bb0: {
-          goto -> bb1;
-      }
-  
-      bb1: {
--         StorageLive(_5);
--         _5 = cond() -> [return: bb2, unwind unreachable];
-+         StorageLive(_4);
-+         _4 = cond() -> [return: bb2, unwind unreachable];
-      }
-  
-      bb2: {
--         switchInt(move _5) -> [0: bb4, otherwise: bb3];
-+         switchInt(move _4) -> [0: bb4, otherwise: bb3];
-      }
-  
-      bb3: {
--         StorageLive(_6);
--         _6 = _3;
--         StorageLive(_7);
--         _7 = _2;
--         _3 = move _7;
--         StorageDead(_7);
--         StorageLive(_8);
--         _8 = _1;
--         _2 = move _8;
--         StorageDead(_8);
--         StorageLive(_9);
--         _9 = _6;
--         _1 = move _9;
--         StorageDead(_9);
--         _4 = const ();
--         StorageDead(_6);
-+         StorageLive(_5);
-          StorageDead(_5);
-+         StorageDead(_4);
-          goto -> bb1;
-      }
-  
-      bb4: {
--         StorageLive(_11);
-          _0 = const ();
--         StorageDead(_11);
--         StorageDead(_5);
-+         StorageDead(_4);
-          return;
-      }
-  }
-  
diff --git a/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-unwind.diff b/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-unwind.diff
deleted file mode 100644
index 4b922e05e10..00000000000
--- a/tests/mir-opt/dead-store-elimination/cycle.cycle.DeadStoreElimination.panic-unwind.diff
+++ /dev/null
@@ -1,73 +0,0 @@
-- // MIR for `cycle` before DeadStoreElimination
-+ // MIR for `cycle` after DeadStoreElimination
-  
-  fn cycle(_1: i32, _2: i32, _3: i32) -> () {
-      debug x => _1;
-      debug y => _2;
-      debug z => _3;
-      let mut _0: ();
--     let mut _4: ();
--     let mut _5: bool;
--     let _6: i32;
--     let mut _7: i32;
--     let mut _8: i32;
--     let mut _9: i32;
--     let mut _10: !;
--     let _11: ();
--     let mut _12: !;
-+     let mut _4: bool;
-+     let _5: i32;
-      scope 1 {
--         debug temp => _6;
-+         debug temp => _5;
-      }
-  
-      bb0: {
-          goto -> bb1;
-      }
-  
-      bb1: {
--         StorageLive(_5);
--         _5 = cond() -> [return: bb2, unwind continue];
-+         StorageLive(_4);
-+         _4 = cond() -> [return: bb2, unwind continue];
-      }
-  
-      bb2: {
--         switchInt(move _5) -> [0: bb4, otherwise: bb3];
-+         switchInt(move _4) -> [0: bb4, otherwise: bb3];
-      }
-  
-      bb3: {
--         StorageLive(_6);
--         _6 = _3;
--         StorageLive(_7);
--         _7 = _2;
--         _3 = move _7;
--         StorageDead(_7);
--         StorageLive(_8);
--         _8 = _1;
--         _2 = move _8;
--         StorageDead(_8);
--         StorageLive(_9);
--         _9 = _6;
--         _1 = move _9;
--         StorageDead(_9);
--         _4 = const ();
--         StorageDead(_6);
-+         StorageLive(_5);
-          StorageDead(_5);
-+         StorageDead(_4);
-          goto -> bb1;
-      }
-  
-      bb4: {
--         StorageLive(_11);
-          _0 = const ();
--         StorageDead(_11);
--         StorageDead(_5);
-+         StorageDead(_4);
-          return;
-      }
-  }
-  
diff --git a/tests/mir-opt/dead-store-elimination/cycle.rs b/tests/mir-opt/dead-store-elimination/cycle.rs
index cd34fe96e8c..e3def2f65da 100644
--- a/tests/mir-opt/dead-store-elimination/cycle.rs
+++ b/tests/mir-opt/dead-store-elimination/cycle.rs
@@ -1,21 +1,40 @@
-// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
+// This example is interesting because the non-transitive version of `MaybeLiveLocals` would
+// report that *all* of these stores are live.
+//
+// needs-unwind
 // unit-test: DeadStoreElimination
 
+#![feature(core_intrinsics, custom_mir)]
+use std::intrinsics::mir::*;
+
 #[inline(never)]
 fn cond() -> bool {
     false
 }
 
 // EMIT_MIR cycle.cycle.DeadStoreElimination.diff
+#[custom_mir(dialect = "runtime", phase = "post-cleanup")]
 fn cycle(mut x: i32, mut y: i32, mut z: i32) {
-    // This example is interesting because the non-transitive version of `MaybeLiveLocals` would
-    // report that *all* of these stores are live.
-    while cond() {
-        let temp = z;
-        z = y;
-        y = x;
-        x = temp;
-    }
+    // We use custom MIR to avoid generating debuginfo, that would force to preserve writes.
+    mir!(
+        let condition: bool;
+        {
+            Call(condition = cond(), bb1)
+        }
+        bb1 = {
+            match condition { true => bb2, _ => ret }
+        }
+        bb2 = {
+            let temp = z;
+            z = y;
+            y = x;
+            x = temp;
+            Call(condition = cond(), bb1)
+        }
+        ret = {
+            Return()
+        }
+    )
 }
 
 fn main() {
diff --git a/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-abort.mir b/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-abort.mir
index a3ec0901075..eb160fc194a 100644
--- a/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-abort.mir
+++ b/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-abort.mir
@@ -7,15 +7,16 @@ fn f(_1: usize) -> usize {
     let mut _3: usize;
     let mut _4: usize;
     scope 1 {
-        debug b => _1;
+        debug b => _3;
     }
 
     bb0: {
         nop;
+        _3 = _1;
+        _1 = const 5_usize;
         nop;
         nop;
-        nop;
-        nop;
+        _1 = move _3;
         nop;
         nop;
         nop;
diff --git a/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-unwind.mir b/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-unwind.mir
index 185feb4b418..9147de2ec47 100644
--- a/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-unwind.mir
+++ b/tests/mir-opt/dest-prop/dead_stores_better.f.DestinationPropagation.after.panic-unwind.mir
@@ -7,15 +7,16 @@ fn f(_1: usize) -> usize {
     let mut _3: usize;
     let mut _4: usize;
     scope 1 {
-        debug b => _1;
+        debug b => _3;
     }
 
     bb0: {
         nop;
+        _3 = _1;
+        _1 = const 5_usize;
         nop;
         nop;
-        nop;
-        nop;
+        _1 = move _3;
         nop;
         nop;
         nop;
diff --git a/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-abort.diff b/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-abort.diff
index 459a9c442b3..d5e58265dcc 100644
--- a/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-abort.diff
+++ b/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-abort.diff
@@ -22,8 +22,10 @@
       }
   
       bb1: {
+          _1 = Un { us: move _2 };
           StorageDead(_2);
           StorageLive(_3);
+          _3 = (_1.0: u32);
           StorageDead(_3);
           StorageDead(_1);
           return;
diff --git a/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-unwind.diff b/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-unwind.diff
index d2eef90582d..5eaaeba135b 100644
--- a/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-unwind.diff
+++ b/tests/mir-opt/dest-prop/union.main.DestinationPropagation.panic-unwind.diff
@@ -22,8 +22,10 @@
       }
   
       bb1: {
+          _1 = Un { us: move _2 };
           StorageDead(_2);
           StorageLive(_3);
+          _3 = (_1.0: u32);
           StorageDead(_3);
           StorageDead(_1);
           return;
diff --git a/tests/mir-opt/issue_101973.inner.ConstProp.panic-abort.diff b/tests/mir-opt/issue_101973.inner.ConstProp.panic-abort.diff
index ce490e894f0..3748d148380 100644
--- a/tests/mir-opt/issue_101973.inner.ConstProp.panic-abort.diff
+++ b/tests/mir-opt/issue_101973.inner.ConstProp.panic-abort.diff
@@ -33,6 +33,7 @@
           StorageLive(_2);
           StorageLive(_3);
           StorageLive(_4);
+          _4 = const 0_u32;
           StorageLive(_15);
           StorageLive(_14);
           _14 = Shr(_1, const 0_i32);
diff --git a/tests/mir-opt/issue_101973.inner.ConstProp.panic-unwind.diff b/tests/mir-opt/issue_101973.inner.ConstProp.panic-unwind.diff
index 254557b9947..9dab4233c56 100644
--- a/tests/mir-opt/issue_101973.inner.ConstProp.panic-unwind.diff
+++ b/tests/mir-opt/issue_101973.inner.ConstProp.panic-unwind.diff
@@ -33,6 +33,7 @@
           StorageLive(_2);
           StorageLive(_3);
           StorageLive(_4);
+          _4 = const 0_u32;
           StorageLive(_15);
           StorageLive(_14);
           _14 = Shr(_1, const 0_i32);
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 55ccf6a8b45..5d25c655700 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
@@ -3,60 +3,61 @@
 fn num_to_digit(_1: char) -> u32 {
     debug num => _1;
     let mut _0: u32;
-    let mut _4: std::option::Option<u32>;
+    let mut _5: 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 _7: &std::option::Option<u32>;
+        let mut _3: &std::option::Option<u32>;
         scope 2 (inlined Option::<u32>::is_some) {
-            debug self => _7;
-            let mut _3: isize;
+            debug self => _3;
+            let mut _4: isize;
         }
     }
     scope 3 (inlined #[track_caller] Option::<u32>::unwrap) {
-        debug self => _4;
-        let mut _5: isize;
-        let mut _6: !;
+        debug self => _5;
+        let mut _6: isize;
+        let mut _7: !;
         scope 4 {
             debug val => _0;
         }
     }
 
     bb0: {
-        StorageLive(_7);
+        StorageLive(_3);
         StorageLive(_2);
         _2 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb1, unwind unreachable];
     }
 
     bb1: {
-        StorageLive(_3);
-        _3 = discriminant(_2);
-        StorageDead(_7);
+        _3 = &_2;
+        StorageLive(_4);
+        _4 = discriminant(_2);
+        StorageDead(_3);
         StorageDead(_2);
-        switchInt(move _3) -> [1: bb2, otherwise: bb7];
+        switchInt(move _4) -> [1: bb2, otherwise: bb7];
     }
 
     bb2: {
-        StorageDead(_3);
-        StorageLive(_4);
-        _4 = char::methods::<impl char>::to_digit(move _1, const 8_u32) -> [return: bb3, unwind unreachable];
+        StorageDead(_4);
+        StorageLive(_5);
+        _5 = char::methods::<impl char>::to_digit(move _1, const 8_u32) -> [return: bb3, unwind unreachable];
     }
 
     bb3: {
-        StorageLive(_5);
-        _5 = discriminant(_4);
-        switchInt(move _5) -> [0: bb4, 1: bb5, otherwise: bb6];
+        StorageLive(_6);
+        _6 = discriminant(_5);
+        switchInt(move _6) -> [0: bb4, 1: bb5, otherwise: bb6];
     }
 
     bb4: {
-        _6 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind unreachable;
+        _7 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind unreachable;
     }
 
     bb5: {
-        _0 = move ((_4 as Some).0: u32);
+        _0 = move ((_5 as Some).0: u32);
+        StorageDead(_6);
         StorageDead(_5);
-        StorageDead(_4);
         goto -> bb8;
     }
 
@@ -65,7 +66,7 @@ fn num_to_digit(_1: char) -> u32 {
     }
 
     bb7: {
-        StorageDead(_3);
+        StorageDead(_4);
         _0 = const 0_u32;
         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 cb70a83e7f8..4677c0108e3 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
@@ -3,60 +3,61 @@
 fn num_to_digit(_1: char) -> u32 {
     debug num => _1;
     let mut _0: u32;
-    let mut _4: std::option::Option<u32>;
+    let mut _5: 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 _7: &std::option::Option<u32>;
+        let mut _3: &std::option::Option<u32>;
         scope 2 (inlined Option::<u32>::is_some) {
-            debug self => _7;
-            let mut _3: isize;
+            debug self => _3;
+            let mut _4: isize;
         }
     }
     scope 3 (inlined #[track_caller] Option::<u32>::unwrap) {
-        debug self => _4;
-        let mut _5: isize;
-        let mut _6: !;
+        debug self => _5;
+        let mut _6: isize;
+        let mut _7: !;
         scope 4 {
             debug val => _0;
         }
     }
 
     bb0: {
-        StorageLive(_7);
+        StorageLive(_3);
         StorageLive(_2);
         _2 = char::methods::<impl char>::to_digit(_1, const 8_u32) -> [return: bb1, unwind continue];
     }
 
     bb1: {
-        StorageLive(_3);
-        _3 = discriminant(_2);
-        StorageDead(_7);
+        _3 = &_2;
+        StorageLive(_4);
+        _4 = discriminant(_2);
+        StorageDead(_3);
         StorageDead(_2);
-        switchInt(move _3) -> [1: bb2, otherwise: bb7];
+        switchInt(move _4) -> [1: bb2, otherwise: bb7];
     }
 
     bb2: {
-        StorageDead(_3);
-        StorageLive(_4);
-        _4 = char::methods::<impl char>::to_digit(move _1, const 8_u32) -> [return: bb3, unwind continue];
+        StorageDead(_4);
+        StorageLive(_5);
+        _5 = char::methods::<impl char>::to_digit(move _1, const 8_u32) -> [return: bb3, unwind continue];
     }
 
     bb3: {
-        StorageLive(_5);
-        _5 = discriminant(_4);
-        switchInt(move _5) -> [0: bb4, 1: bb5, otherwise: bb6];
+        StorageLive(_6);
+        _6 = discriminant(_5);
+        switchInt(move _6) -> [0: bb4, 1: bb5, otherwise: bb6];
     }
 
     bb4: {
-        _6 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind continue;
+        _7 = core::panicking::panic(const "called `Option::unwrap()` on a `None` value") -> unwind continue;
     }
 
     bb5: {
-        _0 = move ((_4 as Some).0: u32);
+        _0 = move ((_5 as Some).0: u32);
+        StorageDead(_6);
         StorageDead(_5);
-        StorageDead(_4);
         goto -> bb8;
     }
 
@@ -65,7 +66,7 @@ fn num_to_digit(_1: char) -> u32 {
     }
 
     bb7: {
-        StorageDead(_3);
+        StorageDead(_4);
         _0 = const 0_u32;
         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 e3c81061a46..cf7feef0051 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
@@ -8,61 +8,62 @@ fn step_forward(_1: u32, _2: usize) -> u32 {
         debug start => _1;
         debug n => _2;
         let _3: std::option::Option<u32>;
-        let mut _6: bool;
-        let mut _7: u32;
-        let mut _8: &std::option::Option<u32>;
+        let mut _4: &std::option::Option<u32>;
+        let mut _7: bool;
+        let mut _8: u32;
         scope 2 {
         }
         scope 3 (inlined Option::<u32>::is_none) {
-            debug self => _8;
-            let mut _5: bool;
+            debug self => _4;
+            let mut _6: bool;
             scope 4 (inlined Option::<u32>::is_some) {
-                debug self => _8;
-                let mut _4: isize;
+                debug self => _4;
+                let mut _5: isize;
             }
         }
         scope 5 (inlined core::num::<impl u32>::wrapping_add) {
             debug self => _1;
-            debug rhs => _7;
+            debug rhs => _8;
         }
     }
 
     bb0: {
-        StorageLive(_6);
-        StorageLive(_8);
+        StorageLive(_7);
+        StorageLive(_4);
         StorageLive(_3);
         _3 = <u32 as Step>::forward_checked(_1, _2) -> [return: bb1, unwind continue];
     }
 
     bb1: {
+        _4 = &_3;
+        StorageLive(_6);
         StorageLive(_5);
-        StorageLive(_4);
-        _4 = discriminant(_3);
-        _5 = Eq(_4, const 1_isize);
-        StorageDead(_4);
-        _6 = Not(move _5);
+        _5 = discriminant(_3);
+        _6 = Eq(_5, const 1_isize);
         StorageDead(_5);
-        switchInt(move _6) -> [0: bb2, otherwise: bb3];
+        _7 = Not(move _6);
+        StorageDead(_6);
+        switchInt(move _7) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
         StorageDead(_3);
-        StorageDead(_8);
+        StorageDead(_4);
         goto -> bb4;
     }
 
     bb3: {
         StorageDead(_3);
-        StorageDead(_8);
+        StorageDead(_4);
         assert(!const true, "attempt to compute `{} + {}`, which would overflow", const _, const 1_u32) -> [success: bb4, unwind continue];
     }
 
     bb4: {
-        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 4db829a5ec3..2fbe5088268 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 +7,20 @@ 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 _8: std::option::Option<U>;
-    let mut _9: isize;
-    let _11: ();
-    let mut _12: &mut 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: ();
     scope 1 {
         debug iter => _5;
-        let _10: U;
+        let _11: U;
         scope 2 {
-            debug x => _10;
+            debug x => _11;
         }
         scope 4 (inlined <FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>> as Iterator>::next) {
-            debug self => _12;
-            let mut _6: &mut impl Iterator<Item = T>;
-            let mut _7: &mut impl Fn(T) -> Option<U>;
+            debug self => _6;
+            let mut _7: &mut impl Iterator<Item = T>;
+            let mut _8: &mut impl Fn(T) -> Option<U>;
         }
     }
     scope 3 (inlined <FilterMap<impl Iterator<Item = T>, impl Fn(T) -> Option<U>> as IntoIterator>::into_iter) {
@@ -42,23 +42,24 @@ fn filter_mapped(_1: impl Iterator<Item = T>, _2: impl Fn(T) -> Option<U>) -> ()
     }
 
     bb2: {
-        StorageLive(_8);
-        StorageLive(_6);
-        _6 = &mut (_5.0: impl Iterator<Item = T>);
+        StorageLive(_9);
+        _6 = &mut _5;
         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];
+        _7 = &mut (_5.0: impl Iterator<Item = T>);
+        StorageLive(_8);
+        _8 = &mut (_5.1: 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];
     }
 
     bb3: {
+        StorageDead(_8);
         StorageDead(_7);
-        StorageDead(_6);
-        _9 = discriminant(_8);
-        switchInt(move _9) -> [0: bb4, 1: bb6, otherwise: bb8];
+        _10 = discriminant(_9);
+        switchInt(move _10) -> [0: bb4, 1: bb6, otherwise: bb8];
     }
 
     bb4: {
-        StorageDead(_8);
+        StorageDead(_9);
         drop(_5) -> [return: bb5, unwind continue];
     }
 
@@ -69,12 +70,12 @@ fn filter_mapped(_1: impl Iterator<Item = T>, _2: impl Fn(T) -> Option<U>) -> ()
     }
 
     bb6: {
-        _10 = move ((_8 as Some).0: U);
-        _11 = opaque::<U>(move _10) -> [return: bb7, unwind: bb9];
+        _11 = move ((_9 as Some).0: U);
+        _12 = opaque::<U>(move _11) -> [return: bb7, unwind: bb9];
     }
 
     bb7: {
-        StorageDead(_8);
+        StorageDead(_9);
         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 0d79f2de10d..49f685cfacd 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
@@ -6,35 +6,35 @@ fn int_range(_1: usize, _2: usize) -> () {
     let mut _0: ();
     let mut _3: std::ops::Range<usize>;
     let mut _4: std::ops::Range<usize>;
-    let mut _8: std::option::Option<usize>;
-    let mut _11: isize;
-    let _13: ();
-    let mut _14: &mut 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: ();
     scope 1 {
         debug iter => _4;
-        let _12: usize;
+        let _15: usize;
         scope 2 {
-            debug i => _12;
+            debug i => _15;
         }
         scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
-            debug self => _14;
+            debug self => _5;
             scope 5 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _14;
-                let mut _7: bool;
-                let _9: usize;
-                let mut _10: usize;
-                let mut _15: &usize;
-                let mut _16: &usize;
+                debug self => _5;
+                let mut _6: &usize;
+                let mut _7: &usize;
+                let mut _10: bool;
+                let _12: usize;
+                let mut _13: usize;
                 scope 6 {
-                    debug old => _9;
+                    debug old => _12;
                     scope 7 {
                     }
                 }
                 scope 8 (inlined cmp::impls::<impl PartialOrd for usize>::lt) {
-                    debug self => _15;
-                    debug other => _16;
-                    let mut _5: usize;
-                    let mut _6: usize;
+                    debug self => _6;
+                    debug other => _7;
+                    let mut _8: usize;
+                    let mut _9: usize;
                 }
             }
         }
@@ -51,63 +51,66 @@ fn int_range(_1: usize, _2: usize) -> () {
     }
 
     bb1: {
+        StorageLive(_11);
+        _5 = &mut _4;
+        StorageLive(_12);
+        StorageLive(_10);
+        StorageLive(_6);
+        _6 = &(_4.0: usize);
+        StorageLive(_7);
+        _7 = &(_4.1: usize);
         StorageLive(_8);
+        _8 = (_4.0: usize);
         StorageLive(_9);
-        StorageLive(_7);
-        StorageLive(_15);
-        StorageLive(_16);
-        StorageLive(_5);
-        _5 = (_4.0: usize);
-        StorageLive(_6);
-        _6 = (_4.1: usize);
-        _7 = Lt(move _5, move _6);
-        StorageDead(_6);
-        StorageDead(_5);
-        switchInt(move _7) -> [0: bb2, otherwise: bb3];
+        _9 = (_4.1: usize);
+        _10 = Lt(move _8, move _9);
+        StorageDead(_9);
+        StorageDead(_8);
+        switchInt(move _10) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        StorageDead(_16);
-        StorageDead(_15);
-        _8 = Option::<usize>::None;
+        StorageDead(_7);
+        StorageDead(_6);
+        _11 = Option::<usize>::None;
         goto -> bb5;
     }
 
     bb3: {
-        StorageDead(_16);
-        StorageDead(_15);
-        _9 = (_4.0: usize);
-        StorageLive(_10);
-        _10 = <usize as Step>::forward_unchecked(_9, const 1_usize) -> [return: bb4, unwind continue];
+        StorageDead(_7);
+        StorageDead(_6);
+        _12 = (_4.0: usize);
+        StorageLive(_13);
+        _13 = <usize as Step>::forward_unchecked(_12, const 1_usize) -> [return: bb4, unwind continue];
     }
 
     bb4: {
-        (_4.0: usize) = move _10;
-        StorageDead(_10);
-        _8 = Option::<usize>::Some(_9);
+        (_4.0: usize) = move _13;
+        StorageDead(_13);
+        _11 = Option::<usize>::Some(_12);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_7);
-        StorageDead(_9);
-        _11 = discriminant(_8);
-        switchInt(move _11) -> [0: bb6, 1: bb7, otherwise: bb9];
+        StorageDead(_10);
+        StorageDead(_12);
+        _14 = discriminant(_11);
+        switchInt(move _14) -> [0: bb6, 1: bb7, otherwise: bb9];
     }
 
     bb6: {
-        StorageDead(_8);
+        StorageDead(_11);
         StorageDead(_4);
         return;
     }
 
     bb7: {
-        _12 = ((_8 as Some).0: usize);
-        _13 = opaque::<usize>(move _12) -> [return: bb8, unwind continue];
+        _15 = ((_11 as Some).0: usize);
+        _16 = opaque::<usize>(move _15) -> [return: bb8, unwind continue];
     }
 
     bb8: {
-        StorageDead(_8);
+        StorageDead(_11);
         goto -> bb1;
     }
 
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 9664ccfb094..91c3731f492 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
@@ -7,37 +7,37 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     let mut _0: ();
     let mut _4: std::ops::Range<u32>;
     let mut _5: std::ops::Range<u32>;
-    let mut _9: std::option::Option<u32>;
-    let mut _12: isize;
-    let mut _14: &impl Fn(u32);
-    let mut _15: (u32,);
-    let _16: ();
-    let mut _17: &mut 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: ();
     scope 1 {
         debug iter => _5;
-        let _13: u32;
+        let _16: u32;
         scope 2 {
-            debug x => _13;
+            debug x => _16;
         }
         scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<u32>>::next) {
-            debug self => _17;
+            debug self => _6;
             scope 5 (inlined <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _17;
-                let mut _8: bool;
-                let _10: u32;
-                let mut _11: u32;
-                let mut _18: &u32;
-                let mut _19: &u32;
+                debug self => _6;
+                let mut _7: &u32;
+                let mut _8: &u32;
+                let mut _11: bool;
+                let _13: u32;
+                let mut _14: u32;
                 scope 6 {
-                    debug old => _10;
+                    debug old => _13;
                     scope 7 {
                     }
                 }
                 scope 8 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                    debug self => _18;
-                    debug other => _19;
-                    let mut _6: u32;
-                    let mut _7: u32;
+                    debug self => _7;
+                    debug other => _8;
+                    let mut _9: u32;
+                    let mut _10: u32;
                 }
             }
         }
@@ -54,52 +54,55 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     }
 
     bb1: {
+        StorageLive(_12);
+        _6 = &mut _5;
+        StorageLive(_13);
+        StorageLive(_11);
+        StorageLive(_7);
+        _7 = &(_5.0: u32);
+        StorageLive(_8);
+        _8 = &(_5.1: u32);
         StorageLive(_9);
+        _9 = (_5.0: u32);
         StorageLive(_10);
-        StorageLive(_8);
-        StorageLive(_18);
-        StorageLive(_19);
-        StorageLive(_6);
-        _6 = (_5.0: u32);
-        StorageLive(_7);
-        _7 = (_5.1: u32);
-        _8 = Lt(move _6, move _7);
-        StorageDead(_7);
-        StorageDead(_6);
-        switchInt(move _8) -> [0: bb2, otherwise: bb3];
+        _10 = (_5.1: u32);
+        _11 = Lt(move _9, move _10);
+        StorageDead(_10);
+        StorageDead(_9);
+        switchInt(move _11) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        StorageDead(_19);
-        StorageDead(_18);
-        _9 = Option::<u32>::None;
+        StorageDead(_8);
+        StorageDead(_7);
+        _12 = Option::<u32>::None;
         goto -> bb5;
     }
 
     bb3: {
-        StorageDead(_19);
-        StorageDead(_18);
-        _10 = (_5.0: u32);
-        StorageLive(_11);
-        _11 = <u32 as Step>::forward_unchecked(_10, const 1_usize) -> [return: bb4, unwind unreachable];
+        StorageDead(_8);
+        StorageDead(_7);
+        _13 = (_5.0: u32);
+        StorageLive(_14);
+        _14 = <u32 as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind unreachable];
     }
 
     bb4: {
-        (_5.0: u32) = move _11;
-        StorageDead(_11);
-        _9 = Option::<u32>::Some(_10);
+        (_5.0: u32) = move _14;
+        StorageDead(_14);
+        _12 = Option::<u32>::Some(_13);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_8);
-        StorageDead(_10);
-        _12 = discriminant(_9);
-        switchInt(move _12) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_11);
+        StorageDead(_13);
+        _15 = discriminant(_12);
+        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_9);
+        StorageDead(_12);
         StorageDead(_5);
         drop(_3) -> [return: bb7, unwind unreachable];
     }
@@ -109,18 +112,18 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     }
 
     bb8: {
-        _13 = ((_9 as Some).0: u32);
-        StorageLive(_14);
-        _14 = &_3;
-        StorageLive(_15);
-        _15 = (_13,);
-        _16 = <impl Fn(u32) as Fn<(u32,)>>::call(move _14, move _15) -> [return: bb9, unwind unreachable];
+        _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];
     }
 
     bb9: {
-        StorageDead(_15);
-        StorageDead(_14);
-        StorageDead(_9);
+        StorageDead(_18);
+        StorageDead(_17);
+        StorageDead(_12);
         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 dc8b46b6c08..f76de02c9d1 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
@@ -7,37 +7,37 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     let mut _0: ();
     let mut _4: std::ops::Range<u32>;
     let mut _5: std::ops::Range<u32>;
-    let mut _9: std::option::Option<u32>;
-    let mut _12: isize;
-    let mut _14: &impl Fn(u32);
-    let mut _15: (u32,);
-    let _16: ();
-    let mut _17: &mut 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: ();
     scope 1 {
         debug iter => _5;
-        let _13: u32;
+        let _16: u32;
         scope 2 {
-            debug x => _13;
+            debug x => _16;
         }
         scope 4 (inlined iter::range::<impl Iterator for std::ops::Range<u32>>::next) {
-            debug self => _17;
+            debug self => _6;
             scope 5 (inlined <std::ops::Range<u32> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _17;
-                let mut _8: bool;
-                let _10: u32;
-                let mut _11: u32;
-                let mut _18: &u32;
-                let mut _19: &u32;
+                debug self => _6;
+                let mut _7: &u32;
+                let mut _8: &u32;
+                let mut _11: bool;
+                let _13: u32;
+                let mut _14: u32;
                 scope 6 {
-                    debug old => _10;
+                    debug old => _13;
                     scope 7 {
                     }
                 }
                 scope 8 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                    debug self => _18;
-                    debug other => _19;
-                    let mut _6: u32;
-                    let mut _7: u32;
+                    debug self => _7;
+                    debug other => _8;
+                    let mut _9: u32;
+                    let mut _10: u32;
                 }
             }
         }
@@ -54,52 +54,55 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     }
 
     bb1: {
+        StorageLive(_12);
+        _6 = &mut _5;
+        StorageLive(_13);
+        StorageLive(_11);
+        StorageLive(_7);
+        _7 = &(_5.0: u32);
+        StorageLive(_8);
+        _8 = &(_5.1: u32);
         StorageLive(_9);
+        _9 = (_5.0: u32);
         StorageLive(_10);
-        StorageLive(_8);
-        StorageLive(_18);
-        StorageLive(_19);
-        StorageLive(_6);
-        _6 = (_5.0: u32);
-        StorageLive(_7);
-        _7 = (_5.1: u32);
-        _8 = Lt(move _6, move _7);
-        StorageDead(_7);
-        StorageDead(_6);
-        switchInt(move _8) -> [0: bb2, otherwise: bb3];
+        _10 = (_5.1: u32);
+        _11 = Lt(move _9, move _10);
+        StorageDead(_10);
+        StorageDead(_9);
+        switchInt(move _11) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        StorageDead(_19);
-        StorageDead(_18);
-        _9 = Option::<u32>::None;
+        StorageDead(_8);
+        StorageDead(_7);
+        _12 = Option::<u32>::None;
         goto -> bb5;
     }
 
     bb3: {
-        StorageDead(_19);
-        StorageDead(_18);
-        _10 = (_5.0: u32);
-        StorageLive(_11);
-        _11 = <u32 as Step>::forward_unchecked(_10, const 1_usize) -> [return: bb4, unwind: bb11];
+        StorageDead(_8);
+        StorageDead(_7);
+        _13 = (_5.0: u32);
+        StorageLive(_14);
+        _14 = <u32 as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind: bb11];
     }
 
     bb4: {
-        (_5.0: u32) = move _11;
-        StorageDead(_11);
-        _9 = Option::<u32>::Some(_10);
+        (_5.0: u32) = move _14;
+        StorageDead(_14);
+        _12 = Option::<u32>::Some(_13);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_8);
-        StorageDead(_10);
-        _12 = discriminant(_9);
-        switchInt(move _12) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_11);
+        StorageDead(_13);
+        _15 = discriminant(_12);
+        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_9);
+        StorageDead(_12);
         StorageDead(_5);
         drop(_3) -> [return: bb7, unwind continue];
     }
@@ -109,18 +112,18 @@ fn forward_loop(_1: u32, _2: u32, _3: impl Fn(u32)) -> () {
     }
 
     bb8: {
-        _13 = ((_9 as Some).0: u32);
-        StorageLive(_14);
-        _14 = &_3;
-        StorageLive(_15);
-        _15 = (_13,);
-        _16 = <impl Fn(u32) as Fn<(u32,)>>::call(move _14, move _15) -> [return: bb9, unwind: bb11];
+        _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];
     }
 
     bb9: {
-        StorageDead(_15);
-        StorageDead(_14);
-        StorageDead(_9);
+        StorageDead(_18);
+        StorageDead(_17);
+        StorageDead(_12);
         goto -> bb1;
     }
 
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 fff713b5a79..a7824f36d50 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
@@ -7,65 +7,67 @@ 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 _4: bool;
-            let _5: u32;
-            let mut _6: u32;
-            let mut _7: &u32;
-            let mut _8: &u32;
+            let mut _2: &u32;
+            let mut _3: &u32;
+            let mut _6: bool;
+            let _7: u32;
+            let mut _8: u32;
             scope 3 {
-                debug old => _5;
+                debug old => _7;
                 scope 4 {
                 }
             }
             scope 5 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                debug self => _7;
-                debug other => _8;
-                let mut _2: u32;
-                let mut _3: u32;
+                debug self => _2;
+                debug other => _3;
+                let mut _4: u32;
+                let mut _5: u32;
             }
         }
     }
 
     bb0: {
-        StorageLive(_5);
-        StorageLive(_4);
         StorageLive(_7);
-        StorageLive(_8);
+        StorageLive(_6);
         StorageLive(_2);
-        _2 = ((*_1).0: u32);
+        _2 = &((*_1).0: u32);
         StorageLive(_3);
-        _3 = ((*_1).1: u32);
-        _4 = Lt(move _2, move _3);
-        StorageDead(_3);
-        StorageDead(_2);
-        switchInt(move _4) -> [0: bb1, otherwise: bb2];
+        _3 = &((*_1).1: u32);
+        StorageLive(_4);
+        _4 = ((*_1).0: u32);
+        StorageLive(_5);
+        _5 = ((*_1).1: u32);
+        _6 = Lt(move _4, move _5);
+        StorageDead(_5);
+        StorageDead(_4);
+        switchInt(move _6) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
-        StorageDead(_8);
-        StorageDead(_7);
+        StorageDead(_3);
+        StorageDead(_2);
         _0 = Option::<u32>::None;
         goto -> bb4;
     }
 
     bb2: {
-        StorageDead(_8);
-        StorageDead(_7);
-        _5 = ((*_1).0: u32);
-        StorageLive(_6);
-        _6 = <u32 as Step>::forward_unchecked(_5, const 1_usize) -> [return: bb3, unwind unreachable];
+        StorageDead(_3);
+        StorageDead(_2);
+        _7 = ((*_1).0: u32);
+        StorageLive(_8);
+        _8 = <u32 as Step>::forward_unchecked(_7, const 1_usize) -> [return: bb3, unwind unreachable];
     }
 
     bb3: {
-        ((*_1).0: u32) = move _6;
-        StorageDead(_6);
-        _0 = Option::<u32>::Some(_5);
+        ((*_1).0: u32) = move _8;
+        StorageDead(_8);
+        _0 = Option::<u32>::Some(_7);
         goto -> bb4;
     }
 
     bb4: {
-        StorageDead(_4);
-        StorageDead(_5);
+        StorageDead(_6);
+        StorageDead(_7);
         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 cc12c0122b7..83c9e6c1af2 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
@@ -7,65 +7,67 @@ 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 _4: bool;
-            let _5: u32;
-            let mut _6: u32;
-            let mut _7: &u32;
-            let mut _8: &u32;
+            let mut _2: &u32;
+            let mut _3: &u32;
+            let mut _6: bool;
+            let _7: u32;
+            let mut _8: u32;
             scope 3 {
-                debug old => _5;
+                debug old => _7;
                 scope 4 {
                 }
             }
             scope 5 (inlined cmp::impls::<impl PartialOrd for u32>::lt) {
-                debug self => _7;
-                debug other => _8;
-                let mut _2: u32;
-                let mut _3: u32;
+                debug self => _2;
+                debug other => _3;
+                let mut _4: u32;
+                let mut _5: u32;
             }
         }
     }
 
     bb0: {
-        StorageLive(_5);
-        StorageLive(_4);
         StorageLive(_7);
-        StorageLive(_8);
+        StorageLive(_6);
         StorageLive(_2);
-        _2 = ((*_1).0: u32);
+        _2 = &((*_1).0: u32);
         StorageLive(_3);
-        _3 = ((*_1).1: u32);
-        _4 = Lt(move _2, move _3);
-        StorageDead(_3);
-        StorageDead(_2);
-        switchInt(move _4) -> [0: bb1, otherwise: bb2];
+        _3 = &((*_1).1: u32);
+        StorageLive(_4);
+        _4 = ((*_1).0: u32);
+        StorageLive(_5);
+        _5 = ((*_1).1: u32);
+        _6 = Lt(move _4, move _5);
+        StorageDead(_5);
+        StorageDead(_4);
+        switchInt(move _6) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
-        StorageDead(_8);
-        StorageDead(_7);
+        StorageDead(_3);
+        StorageDead(_2);
         _0 = Option::<u32>::None;
         goto -> bb4;
     }
 
     bb2: {
-        StorageDead(_8);
-        StorageDead(_7);
-        _5 = ((*_1).0: u32);
-        StorageLive(_6);
-        _6 = <u32 as Step>::forward_unchecked(_5, const 1_usize) -> [return: bb3, unwind continue];
+        StorageDead(_3);
+        StorageDead(_2);
+        _7 = ((*_1).0: u32);
+        StorageLive(_8);
+        _8 = <u32 as Step>::forward_unchecked(_7, const 1_usize) -> [return: bb3, unwind continue];
     }
 
     bb3: {
-        ((*_1).0: u32) = move _6;
-        StorageDead(_6);
-        _0 = Option::<u32>::Some(_5);
+        ((*_1).0: u32) = move _8;
+        StorageDead(_8);
+        _0 = Option::<u32>::Some(_7);
         goto -> bb4;
     }
 
     bb4: {
-        StorageDead(_4);
-        StorageDead(_5);
+        StorageDead(_6);
+        StorageDead(_7);
         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 9c10e96b0ea..b35d3a105ba 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
@@ -10,74 +10,74 @@ fn variant_a::{closure#0}(_1: &mut {closure@$DIR/slice_filter.rs:7:25: 7:39}, _2
     let _8: &usize;
     let mut _9: &(usize, usize, usize, usize);
     let _10: &usize;
-    let _11: &usize;
-    let mut _16: bool;
-    let _17: &usize;
-    let mut _22: bool;
-    let _23: &usize;
-    let mut _28: bool;
-    let _29: &usize;
-    let mut _34: &&usize;
+    let mut _11: &&usize;
+    let _12: &usize;
+    let mut _13: &&usize;
+    let mut _18: bool;
+    let mut _19: &&usize;
+    let _20: &usize;
+    let mut _21: &&usize;
+    let mut _26: bool;
+    let mut _27: &&usize;
+    let _28: &usize;
+    let mut _29: &&usize;
+    let mut _34: bool;
     let mut _35: &&usize;
-    let mut _36: &&usize;
+    let _36: &usize;
     let mut _37: &&usize;
-    let mut _38: &&usize;
-    let mut _39: &&usize;
-    let mut _40: &&usize;
-    let mut _41: &&usize;
     scope 1 {
         debug a => _4;
         debug b => _6;
         debug c => _8;
         debug d => _10;
         scope 2 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _34;
-            debug other => _35;
-            let mut _12: &usize;
-            let mut _13: &usize;
+            debug self => _11;
+            debug other => _13;
+            let mut _14: &usize;
+            let mut _15: &usize;
             scope 3 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
-                debug self => _12;
-                debug other => _13;
-                let mut _14: usize;
-                let mut _15: usize;
+                debug self => _14;
+                debug other => _15;
+                let mut _16: usize;
+                let mut _17: usize;
             }
         }
         scope 4 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _36;
-            debug other => _37;
-            let mut _18: &usize;
-            let mut _19: &usize;
+            debug self => _19;
+            debug other => _21;
+            let mut _22: &usize;
+            let mut _23: &usize;
             scope 5 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
-                debug self => _18;
-                debug other => _19;
-                let mut _20: usize;
-                let mut _21: usize;
+                debug self => _22;
+                debug other => _23;
+                let mut _24: usize;
+                let mut _25: usize;
             }
         }
         scope 6 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _38;
-            debug other => _39;
-            let mut _24: &usize;
-            let mut _25: &usize;
-            scope 7 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
-                debug self => _24;
-                debug other => _25;
-                let mut _26: usize;
-                let mut _27: usize;
-            }
-        }
-        scope 8 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
-            debug self => _40;
-            debug other => _41;
+            debug self => _27;
+            debug other => _29;
             let mut _30: &usize;
             let mut _31: &usize;
-            scope 9 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
+            scope 7 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
                 debug self => _30;
                 debug other => _31;
                 let mut _32: usize;
                 let mut _33: usize;
             }
         }
+        scope 8 (inlined cmp::impls::<impl PartialOrd for &usize>::le) {
+            debug self => _35;
+            debug other => _37;
+            let mut _38: &usize;
+            let mut _39: &usize;
+            scope 9 (inlined cmp::impls::<impl PartialOrd for usize>::le) {
+                debug self => _38;
+                debug other => _39;
+                let mut _40: usize;
+                let mut _41: usize;
+            }
+        }
     }
 
     bb0: {
@@ -93,139 +93,147 @@ fn variant_a::{closure#0}(_1: &mut {closure@$DIR/slice_filter.rs:7:25: 7:39}, _2
         StorageLive(_10);
         _9 = deref_copy (*_2);
         _10 = &((*_9).3: usize);
-        StorageLive(_16);
-        StorageLive(_34);
-        StorageLive(_35);
+        StorageLive(_18);
         StorageLive(_11);
-        _11 = _8;
-        StorageLive(_12);
+        _11 = &_4;
         StorageLive(_13);
-        _12 = deref_copy _4;
-        _13 = deref_copy _11;
+        StorageLive(_12);
+        _12 = _8;
+        _13 = &_12;
         StorageLive(_14);
-        _14 = (*_12);
         StorageLive(_15);
-        _15 = (*_13);
-        _16 = Le(move _14, move _15);
+        _14 = deref_copy _4;
+        _15 = deref_copy _12;
+        StorageLive(_16);
+        _16 = (*_14);
+        StorageLive(_17);
+        _17 = (*_15);
+        _18 = Le(move _16, move _17);
+        StorageDead(_17);
+        StorageDead(_16);
         StorageDead(_15);
         StorageDead(_14);
-        StorageDead(_13);
-        StorageDead(_12);
-        switchInt(move _16) -> [0: bb1, otherwise: bb2];
+        switchInt(move _18) -> [0: bb1, otherwise: bb2];
     }
 
     bb1: {
+        StorageDead(_12);
+        StorageDead(_13);
         StorageDead(_11);
-        StorageDead(_35);
-        StorageDead(_34);
         goto -> bb4;
     }
 
     bb2: {
+        StorageDead(_12);
+        StorageDead(_13);
         StorageDead(_11);
-        StorageDead(_35);
-        StorageDead(_34);
-        StorageLive(_22);
-        StorageLive(_36);
-        StorageLive(_37);
-        StorageLive(_17);
-        _17 = _6;
-        StorageLive(_18);
+        StorageLive(_26);
         StorageLive(_19);
-        _18 = deref_copy _10;
-        _19 = deref_copy _17;
-        StorageLive(_20);
-        _20 = (*_18);
+        _19 = &_10;
         StorageLive(_21);
-        _21 = (*_19);
-        _22 = Le(move _20, move _21);
-        StorageDead(_21);
-        StorageDead(_20);
-        StorageDead(_19);
-        StorageDead(_18);
-        switchInt(move _22) -> [0: bb3, otherwise: bb8];
-    }
-
-    bb3: {
-        StorageDead(_17);
-        StorageDead(_37);
-        StorageDead(_36);
-        goto -> bb4;
-    }
-
-    bb4: {
-        StorageLive(_28);
-        StorageLive(_38);
-        StorageLive(_39);
+        StorageLive(_20);
+        _20 = _6;
+        _21 = &_20;
+        StorageLive(_22);
         StorageLive(_23);
-        _23 = _4;
+        _22 = deref_copy _10;
+        _23 = deref_copy _20;
         StorageLive(_24);
+        _24 = (*_22);
         StorageLive(_25);
-        _24 = deref_copy _8;
-        _25 = deref_copy _23;
-        StorageLive(_26);
-        _26 = (*_24);
-        StorageLive(_27);
-        _27 = (*_25);
-        _28 = Le(move _26, move _27);
-        StorageDead(_27);
-        StorageDead(_26);
+        _25 = (*_23);
+        _26 = Le(move _24, move _25);
         StorageDead(_25);
         StorageDead(_24);
-        switchInt(move _28) -> [0: bb5, otherwise: bb6];
+        StorageDead(_23);
+        StorageDead(_22);
+        switchInt(move _26) -> [0: bb3, otherwise: bb8];
     }
 
-    bb5: {
-        StorageDead(_23);
-        StorageDead(_39);
-        StorageDead(_38);
-        _0 = const false;
-        goto -> bb7;
+    bb3: {
+        StorageDead(_20);
+        StorageDead(_21);
+        StorageDead(_19);
+        goto -> bb4;
     }
 
-    bb6: {
-        StorageDead(_23);
-        StorageDead(_39);
-        StorageDead(_38);
-        StorageLive(_40);
-        StorageLive(_41);
+    bb4: {
+        StorageLive(_34);
+        StorageLive(_27);
+        _27 = &_8;
         StorageLive(_29);
-        _29 = _10;
+        StorageLive(_28);
+        _28 = _4;
+        _29 = &_28;
         StorageLive(_30);
         StorageLive(_31);
-        _30 = deref_copy _6;
-        _31 = deref_copy _29;
+        _30 = deref_copy _8;
+        _31 = deref_copy _28;
         StorageLive(_32);
         _32 = (*_30);
         StorageLive(_33);
         _33 = (*_31);
-        _0 = Le(move _32, move _33);
+        _34 = Le(move _32, move _33);
         StorageDead(_33);
         StorageDead(_32);
         StorageDead(_31);
         StorageDead(_30);
+        switchInt(move _34) -> [0: bb5, otherwise: bb6];
+    }
+
+    bb5: {
+        StorageDead(_28);
         StorageDead(_29);
+        StorageDead(_27);
+        _0 = const false;
+        goto -> bb7;
+    }
+
+    bb6: {
+        StorageDead(_28);
+        StorageDead(_29);
+        StorageDead(_27);
+        StorageLive(_35);
+        _35 = &_6;
+        StorageLive(_37);
+        StorageLive(_36);
+        _36 = _10;
+        _37 = &_36;
+        StorageLive(_38);
+        StorageLive(_39);
+        _38 = deref_copy _6;
+        _39 = deref_copy _36;
+        StorageLive(_40);
+        _40 = (*_38);
+        StorageLive(_41);
+        _41 = (*_39);
+        _0 = Le(move _40, move _41);
         StorageDead(_41);
         StorageDead(_40);
+        StorageDead(_39);
+        StorageDead(_38);
+        StorageDead(_36);
+        StorageDead(_37);
+        StorageDead(_35);
         goto -> bb7;
     }
 
     bb7: {
-        StorageDead(_28);
+        StorageDead(_34);
         goto -> bb9;
     }
 
     bb8: {
-        StorageDead(_17);
-        StorageDead(_37);
-        StorageDead(_36);
+        StorageDead(_20);
+        StorageDead(_21);
+        StorageDead(_19);
         _0 = const true;
         goto -> bb9;
     }
 
     bb9: {
-        StorageDead(_22);
-        StorageDead(_16);
+        StorageDead(_26);
+        StorageDead(_18);
         StorageDead(_10);
         StorageDead(_8);
         StorageDead(_6);
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 2fd669aeeb6..729841ec5ea 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
@@ -19,11 +19,9 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
                 debug slice => _5;
                 let mut _7: *mut u32;
                 let mut _8: *mut u32;
-                let _15: usize;
-                let _16: usize;
                 scope 4 {
-                    debug ((this: std::ops::Range<usize>).0: usize) => _15;
-                    debug ((this: std::ops::Range<usize>).1: usize) => _16;
+                    debug ((this: std::ops::Range<usize>).0: usize) => _3;
+                    debug ((this: std::ops::Range<usize>).1: usize) => _4;
                     scope 5 {
                         let _6: usize;
                         scope 6 {
@@ -56,8 +54,8 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
                             }
                         }
                         scope 7 (inlined <std::ops::Range<usize> as SliceIndex<[T]>>::get_unchecked_mut::runtime::<u32>) {
-                            debug ((this: std::ops::Range<usize>).0: usize) => _15;
-                            debug ((this: std::ops::Range<usize>).1: usize) => _16;
+                            debug ((this: std::ops::Range<usize>).0: usize) => _3;
+                            debug ((this: std::ops::Range<usize>).1: usize) => _4;
                             debug slice => _5;
                             scope 8 (inlined ptr::mut_ptr::<impl *mut [u32]>::len) {
                                 debug self => _5;
@@ -82,8 +80,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         _5 = &raw mut (*_1);
         StorageLive(_6);
         StorageLive(_14);
-        StorageLive(_15);
-        StorageLive(_16);
         _6 = SubUnchecked(_4, _3);
         StorageLive(_8);
         StorageLive(_7);
@@ -104,8 +100,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         StorageDead(_12);
         StorageDead(_9);
         StorageDead(_8);
-        StorageDead(_16);
-        StorageDead(_15);
         StorageDead(_14);
         StorageDead(_6);
         StorageDead(_5);
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 2fd669aeeb6..729841ec5ea 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
@@ -19,11 +19,9 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
                 debug slice => _5;
                 let mut _7: *mut u32;
                 let mut _8: *mut u32;
-                let _15: usize;
-                let _16: usize;
                 scope 4 {
-                    debug ((this: std::ops::Range<usize>).0: usize) => _15;
-                    debug ((this: std::ops::Range<usize>).1: usize) => _16;
+                    debug ((this: std::ops::Range<usize>).0: usize) => _3;
+                    debug ((this: std::ops::Range<usize>).1: usize) => _4;
                     scope 5 {
                         let _6: usize;
                         scope 6 {
@@ -56,8 +54,8 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
                             }
                         }
                         scope 7 (inlined <std::ops::Range<usize> as SliceIndex<[T]>>::get_unchecked_mut::runtime::<u32>) {
-                            debug ((this: std::ops::Range<usize>).0: usize) => _15;
-                            debug ((this: std::ops::Range<usize>).1: usize) => _16;
+                            debug ((this: std::ops::Range<usize>).0: usize) => _3;
+                            debug ((this: std::ops::Range<usize>).1: usize) => _4;
                             debug slice => _5;
                             scope 8 (inlined ptr::mut_ptr::<impl *mut [u32]>::len) {
                                 debug self => _5;
@@ -82,8 +80,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         _5 = &raw mut (*_1);
         StorageLive(_6);
         StorageLive(_14);
-        StorageLive(_15);
-        StorageLive(_16);
         _6 = SubUnchecked(_4, _3);
         StorageLive(_8);
         StorageLive(_7);
@@ -104,8 +100,6 @@ fn slice_get_unchecked_mut_range(_1: &mut [u32], _2: std::ops::Range<usize>) ->
         StorageDead(_12);
         StorageDead(_9);
         StorageDead(_8);
-        StorageDead(_16);
-        StorageDead(_15);
         StorageDead(_14);
         StorageDead(_6);
         StorageDead(_5);
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 4afe2eda188..ac1de7b4c90 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
@@ -7,43 +7,43 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     let mut _3: usize;
     let mut _4: std::ops::Range<usize>;
     let mut _5: std::ops::Range<usize>;
-    let mut _9: std::option::Option<usize>;
-    let mut _12: isize;
-    let mut _14: usize;
-    let mut _15: bool;
-    let mut _17: &impl Fn(usize, &T);
-    let mut _18: (usize, &T);
-    let _19: ();
-    let mut _20: &mut 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: ();
     scope 1 {
         debug iter => _5;
-        let _13: usize;
+        let _16: usize;
         scope 2 {
-            debug i => _13;
-            let _16: &T;
+            debug i => _16;
+            let _19: &T;
             scope 3 {
-                debug x => _16;
+                debug x => _19;
             }
         }
         scope 5 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
-            debug self => _20;
+            debug self => _6;
             scope 6 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _20;
-                let mut _8: bool;
-                let _10: usize;
-                let mut _11: usize;
-                let mut _21: &usize;
-                let mut _22: &usize;
+                debug self => _6;
+                let mut _7: &usize;
+                let mut _8: &usize;
+                let mut _11: bool;
+                let _13: usize;
+                let mut _14: usize;
                 scope 7 {
-                    debug old => _10;
+                    debug old => _13;
                     scope 8 {
                     }
                 }
                 scope 9 (inlined cmp::impls::<impl PartialOrd for usize>::lt) {
-                    debug self => _21;
-                    debug other => _22;
-                    let mut _6: usize;
-                    let mut _7: usize;
+                    debug self => _7;
+                    debug other => _8;
+                    let mut _9: usize;
+                    let mut _10: usize;
                 }
             }
         }
@@ -63,52 +63,55 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     }
 
     bb1: {
+        StorageLive(_12);
+        _6 = &mut _5;
+        StorageLive(_13);
+        StorageLive(_11);
+        StorageLive(_7);
+        _7 = &(_5.0: usize);
+        StorageLive(_8);
+        _8 = &(_5.1: usize);
         StorageLive(_9);
+        _9 = (_5.0: usize);
         StorageLive(_10);
-        StorageLive(_8);
-        StorageLive(_21);
-        StorageLive(_22);
-        StorageLive(_6);
-        _6 = (_5.0: usize);
-        StorageLive(_7);
-        _7 = (_5.1: usize);
-        _8 = Lt(move _6, move _7);
-        StorageDead(_7);
-        StorageDead(_6);
-        switchInt(move _8) -> [0: bb2, otherwise: bb3];
+        _10 = (_5.1: usize);
+        _11 = Lt(move _9, move _10);
+        StorageDead(_10);
+        StorageDead(_9);
+        switchInt(move _11) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        StorageDead(_22);
-        StorageDead(_21);
-        _9 = Option::<usize>::None;
+        StorageDead(_8);
+        StorageDead(_7);
+        _12 = Option::<usize>::None;
         goto -> bb5;
     }
 
     bb3: {
-        StorageDead(_22);
-        StorageDead(_21);
-        _10 = (_5.0: usize);
-        StorageLive(_11);
-        _11 = <usize as Step>::forward_unchecked(_10, const 1_usize) -> [return: bb4, unwind unreachable];
+        StorageDead(_8);
+        StorageDead(_7);
+        _13 = (_5.0: usize);
+        StorageLive(_14);
+        _14 = <usize as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind unreachable];
     }
 
     bb4: {
-        (_5.0: usize) = move _11;
-        StorageDead(_11);
-        _9 = Option::<usize>::Some(_10);
+        (_5.0: usize) = move _14;
+        StorageDead(_14);
+        _12 = Option::<usize>::Some(_13);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_8);
-        StorageDead(_10);
-        _12 = discriminant(_9);
-        switchInt(move _12) -> [0: bb6, 1: bb8, otherwise: bb11];
+        StorageDead(_11);
+        StorageDead(_13);
+        _15 = discriminant(_12);
+        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb11];
     }
 
     bb6: {
-        StorageDead(_9);
+        StorageDead(_12);
         StorageDead(_5);
         drop(_2) -> [return: bb7, unwind unreachable];
     }
@@ -118,25 +121,25 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     }
 
     bb8: {
-        _13 = ((_9 as Some).0: usize);
-        _14 = Len((*_1));
-        _15 = Lt(_13, _14);
-        assert(move _15, "index out of bounds: the length is {} but the index is {}", move _14, _13) -> [success: bb9, unwind unreachable];
+        _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];
     }
 
     bb9: {
-        _16 = &(*_1)[_13];
-        StorageLive(_17);
-        _17 = &_2;
-        StorageLive(_18);
-        _18 = (_13, _16);
-        _19 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _17, move _18) -> [return: bb10, unwind unreachable];
+        _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];
     }
 
     bb10: {
-        StorageDead(_18);
-        StorageDead(_17);
-        StorageDead(_9);
+        StorageDead(_21);
+        StorageDead(_20);
+        StorageDead(_12);
         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 48092608d9c..3c49ecf95a1 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
@@ -7,43 +7,43 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     let mut _3: usize;
     let mut _4: std::ops::Range<usize>;
     let mut _5: std::ops::Range<usize>;
-    let mut _9: std::option::Option<usize>;
-    let mut _12: isize;
-    let mut _14: usize;
-    let mut _15: bool;
-    let mut _17: &impl Fn(usize, &T);
-    let mut _18: (usize, &T);
-    let _19: ();
-    let mut _20: &mut 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: ();
     scope 1 {
         debug iter => _5;
-        let _13: usize;
+        let _16: usize;
         scope 2 {
-            debug i => _13;
-            let _16: &T;
+            debug i => _16;
+            let _19: &T;
             scope 3 {
-                debug x => _16;
+                debug x => _19;
             }
         }
         scope 5 (inlined iter::range::<impl Iterator for std::ops::Range<usize>>::next) {
-            debug self => _20;
+            debug self => _6;
             scope 6 (inlined <std::ops::Range<usize> as iter::range::RangeIteratorImpl>::spec_next) {
-                debug self => _20;
-                let mut _8: bool;
-                let _10: usize;
-                let mut _11: usize;
-                let mut _21: &usize;
-                let mut _22: &usize;
+                debug self => _6;
+                let mut _7: &usize;
+                let mut _8: &usize;
+                let mut _11: bool;
+                let _13: usize;
+                let mut _14: usize;
                 scope 7 {
-                    debug old => _10;
+                    debug old => _13;
                     scope 8 {
                     }
                 }
                 scope 9 (inlined cmp::impls::<impl PartialOrd for usize>::lt) {
-                    debug self => _21;
-                    debug other => _22;
-                    let mut _6: usize;
-                    let mut _7: usize;
+                    debug self => _7;
+                    debug other => _8;
+                    let mut _9: usize;
+                    let mut _10: usize;
                 }
             }
         }
@@ -63,52 +63,55 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     }
 
     bb1: {
+        StorageLive(_12);
+        _6 = &mut _5;
+        StorageLive(_13);
+        StorageLive(_11);
+        StorageLive(_7);
+        _7 = &(_5.0: usize);
+        StorageLive(_8);
+        _8 = &(_5.1: usize);
         StorageLive(_9);
+        _9 = (_5.0: usize);
         StorageLive(_10);
-        StorageLive(_8);
-        StorageLive(_21);
-        StorageLive(_22);
-        StorageLive(_6);
-        _6 = (_5.0: usize);
-        StorageLive(_7);
-        _7 = (_5.1: usize);
-        _8 = Lt(move _6, move _7);
-        StorageDead(_7);
-        StorageDead(_6);
-        switchInt(move _8) -> [0: bb2, otherwise: bb3];
+        _10 = (_5.1: usize);
+        _11 = Lt(move _9, move _10);
+        StorageDead(_10);
+        StorageDead(_9);
+        switchInt(move _11) -> [0: bb2, otherwise: bb3];
     }
 
     bb2: {
-        StorageDead(_22);
-        StorageDead(_21);
-        _9 = Option::<usize>::None;
+        StorageDead(_8);
+        StorageDead(_7);
+        _12 = Option::<usize>::None;
         goto -> bb5;
     }
 
     bb3: {
-        StorageDead(_22);
-        StorageDead(_21);
-        _10 = (_5.0: usize);
-        StorageLive(_11);
-        _11 = <usize as Step>::forward_unchecked(_10, const 1_usize) -> [return: bb4, unwind: bb12];
+        StorageDead(_8);
+        StorageDead(_7);
+        _13 = (_5.0: usize);
+        StorageLive(_14);
+        _14 = <usize as Step>::forward_unchecked(_13, const 1_usize) -> [return: bb4, unwind: bb12];
     }
 
     bb4: {
-        (_5.0: usize) = move _11;
-        StorageDead(_11);
-        _9 = Option::<usize>::Some(_10);
+        (_5.0: usize) = move _14;
+        StorageDead(_14);
+        _12 = Option::<usize>::Some(_13);
         goto -> bb5;
     }
 
     bb5: {
-        StorageDead(_8);
-        StorageDead(_10);
-        _12 = discriminant(_9);
-        switchInt(move _12) -> [0: bb6, 1: bb8, otherwise: bb11];
+        StorageDead(_11);
+        StorageDead(_13);
+        _15 = discriminant(_12);
+        switchInt(move _15) -> [0: bb6, 1: bb8, otherwise: bb11];
     }
 
     bb6: {
-        StorageDead(_9);
+        StorageDead(_12);
         StorageDead(_5);
         drop(_2) -> [return: bb7, unwind continue];
     }
@@ -118,25 +121,25 @@ fn range_loop(_1: &[T], _2: impl Fn(usize, &T)) -> () {
     }
 
     bb8: {
-        _13 = ((_9 as Some).0: usize);
-        _14 = Len((*_1));
-        _15 = Lt(_13, _14);
-        assert(move _15, "index out of bounds: the length is {} but the index is {}", move _14, _13) -> [success: bb9, unwind: bb12];
+        _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];
     }
 
     bb9: {
-        _16 = &(*_1)[_13];
-        StorageLive(_17);
-        _17 = &_2;
-        StorageLive(_18);
-        _18 = (_13, _16);
-        _19 = <impl Fn(usize, &T) as Fn<(usize, &T)>>::call(move _17, move _18) -> [return: bb10, unwind: bb12];
+        _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];
     }
 
     bb10: {
-        StorageDead(_18);
-        StorageDead(_17);
-        StorageDead(_9);
+        StorageDead(_21);
+        StorageDead(_20);
+        StorageDead(_12);
         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 549cb4f46a0..f3760463fe0 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 +7,21 @@ 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 _17: std::option::Option<&T>;
-    let mut _18: isize;
-    let mut _20: &impl Fn(&T);
-    let mut _21: (&T,);
-    let _22: ();
-    let mut _23: &mut 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: ();
     scope 1 {
         debug iter => _15;
-        let _19: &T;
+        let _20: &T;
         scope 2 {
-            debug x => _19;
+            debug x => _20;
         }
         scope 25 (inlined <Rev<std::slice::Iter<'_, T>> as Iterator>::next) {
-            debug self => _23;
-            let mut _16: &mut std::slice::Iter<'_, T>;
+            debug self => _16;
+            let mut _17: &mut std::slice::Iter<'_, T>;
         }
     }
     scope 3 (inlined core::slice::<impl [T]>::iter) {
@@ -153,20 +153,21 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb4: {
+        StorageLive(_18);
+        _16 = &mut _15;
         StorageLive(_17);
-        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];
+        _17 = &mut (_15.0: std::slice::Iter<'_, T>);
+        _18 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _17) -> [return: bb5, unwind unreachable];
     }
 
     bb5: {
-        StorageDead(_16);
-        _18 = discriminant(_17);
-        switchInt(move _18) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_17);
+        _19 = discriminant(_18);
+        switchInt(move _19) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_17);
+        StorageDead(_18);
         StorageDead(_15);
         drop(_2) -> [return: bb7, unwind unreachable];
     }
@@ -176,18 +177,18 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb8: {
-        _19 = ((_17 as Some).0: &T);
-        StorageLive(_20);
-        _20 = &_2;
+        _20 = ((_18 as Some).0: &T);
         StorageLive(_21);
-        _21 = (_19,);
-        _22 = <impl Fn(&T) as Fn<(&T,)>>::call(move _20, move _21) -> [return: bb9, unwind unreachable];
+        _21 = &_2;
+        StorageLive(_22);
+        _22 = (_20,);
+        _23 = <impl Fn(&T) as Fn<(&T,)>>::call(move _21, move _22) -> [return: bb9, unwind unreachable];
     }
 
     bb9: {
+        StorageDead(_22);
         StorageDead(_21);
-        StorageDead(_20);
-        StorageDead(_17);
+        StorageDead(_18);
         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 3cdc49f6056..e63f8b89308 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 +7,21 @@ 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 _17: std::option::Option<&T>;
-    let mut _18: isize;
-    let mut _20: &impl Fn(&T);
-    let mut _21: (&T,);
-    let _22: ();
-    let mut _23: &mut 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: ();
     scope 1 {
         debug iter => _15;
-        let _19: &T;
+        let _20: &T;
         scope 2 {
-            debug x => _19;
+            debug x => _20;
         }
         scope 25 (inlined <Rev<std::slice::Iter<'_, T>> as Iterator>::next) {
-            debug self => _23;
-            let mut _16: &mut std::slice::Iter<'_, T>;
+            debug self => _16;
+            let mut _17: &mut std::slice::Iter<'_, T>;
         }
     }
     scope 3 (inlined core::slice::<impl [T]>::iter) {
@@ -153,20 +153,21 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb4: {
+        StorageLive(_18);
+        _16 = &mut _15;
         StorageLive(_17);
-        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];
+        _17 = &mut (_15.0: std::slice::Iter<'_, T>);
+        _18 = <std::slice::Iter<'_, T> as DoubleEndedIterator>::next_back(move _17) -> [return: bb5, unwind: bb11];
     }
 
     bb5: {
-        StorageDead(_16);
-        _18 = discriminant(_17);
-        switchInt(move _18) -> [0: bb6, 1: bb8, otherwise: bb10];
+        StorageDead(_17);
+        _19 = discriminant(_18);
+        switchInt(move _19) -> [0: bb6, 1: bb8, otherwise: bb10];
     }
 
     bb6: {
-        StorageDead(_17);
+        StorageDead(_18);
         StorageDead(_15);
         drop(_2) -> [return: bb7, unwind continue];
     }
@@ -176,18 +177,18 @@ fn reverse_loop(_1: &[T], _2: impl Fn(&T)) -> () {
     }
 
     bb8: {
-        _19 = ((_17 as Some).0: &T);
-        StorageLive(_20);
-        _20 = &_2;
+        _20 = ((_18 as Some).0: &T);
         StorageLive(_21);
-        _21 = (_19,);
-        _22 = <impl Fn(&T) as Fn<(&T,)>>::call(move _20, move _21) -> [return: bb9, unwind: bb11];
+        _21 = &_2;
+        StorageLive(_22);
+        _22 = (_20,);
+        _23 = <impl Fn(&T) as Fn<(&T,)>>::call(move _21, move _22) -> [return: bb9, unwind: bb11];
     }
 
     bb9: {
+        StorageDead(_22);
         StorageDead(_21);
-        StorageDead(_20);
-        StorageDead(_17);
+        StorageDead(_18);
         goto -> bb4;
     }