diff --git a/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-abort.diff b/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-abort.diff
index 6484b4b67af95..ff93c85e5869d 100644
--- a/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-abort.diff
+++ b/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-abort.diff
@@ -5,17 +5,24 @@
       let mut _0: ();
       let _1: ();
       let mut _2: ((), u8, u8);
+      let mut _3: ();
   
       bb0: {
+          StorageLive(_1);
           StorageLive(_2);
--         _2 = (const (), const 0_u8, const 0_u8);
--         _1 = encode(move _2) -> [return: bb1, unwind unreachable];
+          StorageLive(_3);
+          _3 = ();
+-         _2 = (move _3, const 0_u8, const 0_u8);
 +         _2 = const ((), 0_u8, 0_u8);
+          StorageDead(_3);
+-         _1 = encode(move _2) -> [return: bb1, unwind unreachable];
 +         _1 = encode(const ((), 0_u8, 0_u8)) -> [return: bb1, unwind unreachable];
       }
   
       bb1: {
           StorageDead(_2);
+          StorageDead(_1);
+          _0 = const ();
           return;
       }
 + }
diff --git a/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-unwind.diff b/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-unwind.diff
index b02f040783985..8790aad4559c1 100644
--- a/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-unwind.diff
+++ b/tests/mir-opt/const_prop/issue_66971.main.ConstProp.panic-unwind.diff
@@ -5,17 +5,24 @@
       let mut _0: ();
       let _1: ();
       let mut _2: ((), u8, u8);
+      let mut _3: ();
   
       bb0: {
+          StorageLive(_1);
           StorageLive(_2);
--         _2 = (const (), const 0_u8, const 0_u8);
--         _1 = encode(move _2) -> [return: bb1, unwind continue];
+          StorageLive(_3);
+          _3 = ();
+-         _2 = (move _3, const 0_u8, const 0_u8);
 +         _2 = const ((), 0_u8, 0_u8);
+          StorageDead(_3);
+-         _1 = encode(move _2) -> [return: bb1, unwind continue];
 +         _1 = encode(const ((), 0_u8, 0_u8)) -> [return: bb1, unwind continue];
       }
   
       bb1: {
           StorageDead(_2);
+          StorageDead(_1);
+          _0 = const ();
           return;
       }
 + }
diff --git a/tests/mir-opt/const_prop/issue_66971.rs b/tests/mir-opt/const_prop/issue_66971.rs
index 386c95b5b69cc..49d598ff23064 100644
--- a/tests/mir-opt/const_prop/issue_66971.rs
+++ b/tests/mir-opt/const_prop/issue_66971.rs
@@ -1,7 +1,5 @@
-// skip-filecheck
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // unit-test: ConstProp
-// compile-flags: -Z mir-opt-level=3
 
 // Due to a bug in propagating scalar pairs the assertion below used to fail. In the expected
 // outputs below, after ConstProp this is how _2 would look like with the bug:
@@ -16,5 +14,7 @@ fn encode(this: ((), u8, u8)) {
 
 // EMIT_MIR issue_66971.main.ConstProp.diff
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: = encode(const ((), 0_u8, 0_u8))
     encode(((), 0, 0));
 }