Code change:
<ins> - // MIR for `bar` before Inline + // MIR for `bar` after Inline fn bar(_1: P) -> () { debug _baz => _1;                    // in scope 0 at $DIR/issue-78442.rs:9:5: 9:9 let mut _0: ();                      // return place in scope 0 at $DIR/issue-78442.rs:10:3: 10:3 let _2: ();                          // in scope 0 at $DIR/issue-78442.rs:11:5: 11:17 let mut _3: &fn() {foo};             // in scope 0 at $DIR/issue-78442.rs:11:5: 11:15 let _4: fn() {foo};                  // in scope 0 at $DIR/issue-78442.rs:11:5: 11:15 let mut _5: ();                      // in scope 0 at $DIR/issue-78442.rs:11:5: 11:17 +     scope 1 (inlined <fn() {foo} as Fn<()>>::call - shim(fn() {foo})) { // at $DIR/issue-78442.rs:11:5: 11:17 +     } bb0: { StorageLive(_2);                 // scope 0 at $DIR/issue-78442.rs:11:5: 11:17 StorageLive(_3);                 // scope 0 at $DIR/issue-78442.rs:11:5: 11:15 StorageLive(_4);                 // scope 0 at $DIR/issue-78442.rs:11:5: 11:15 -         _4 = hide_foo() -> [return: bb1, unwind: bb4]; // scope 0 at $DIR/issue-78442.rs:11:5: 11:15 +         _4 = hide_foo() -> [return: bb1, unwind: bb3]; // scope 0 at $DIR/issue-78442.rs:11:5: 11:15 // mir::Constant // + span: $DIR/issue-78442.rs:11:5: 11:13 // + literal: Const { ty: fn() -> impl std::ops::Fn<()> {hide_foo}, val: Value(Scalar(<ZST>)) } } bb1: { _3 = &_4;                        // scope 0 at $DIR/issue-78442.rs:11:5: 11:15 StorageLive(_5);                 // scope 0 at $DIR/issue-78442.rs:11:5: 11:17 -         _2 = <impl Fn<()> as Fn<()>>::call(move _3, move _5) -> [return: bb2, unwind: bb4]; // scope 0 at $DIR/issue-78442.rs:11:5: 11:17 -                                          // mir::Constant -                                          // + span: $DIR/issue-78442.rs:11:5: 11:15 -                                          // + literal: Const { ty: for<'r> extern "rust-call" fn(&'r impl std::ops::Fn<()>, ()) -> <impl std::ops::Fn<()> as std::ops::FnOnce<()>>::Output {<impl std::ops::Fn<()> as std::ops::Fn<()>>::call}, val: Value(Scalar(<ZST>)) } +         _2 = move (*_3)() -> [return: bb5, unwind: bb3]; // scope 1 at $DIR/issue-78442.rs:11:5: 11:17 } bb2: { -         StorageDead(_5);                 // scope 0 at $DIR/issue-78442.rs:11:16: 11:17 -         StorageDead(_3);                 // scope 0 at $DIR/issue-78442.rs:11:16: 11:17 -         StorageDead(_4);                 // scope 0 at $DIR/issue-78442.rs:11:17: 11:18 -         StorageDead(_2);                 // scope 0 at $DIR/issue-78442.rs:11:17: 11:18 -         _0 = const ();                   // scope 0 at $DIR/issue-78442.rs:10:3: 12:2 -         drop(_1) -> [return: bb3, unwind: bb5]; // scope 0 at $DIR/issue-78442.rs:12:1: 12:2 +         return;                          // scope 0 at $DIR/issue-78442.rs:12:2: 12:2 } -     bb3: { -         return;                          // scope 0 at $DIR/issue-78442.rs:12:2: 12:2 +     bb3 (cleanup): { +         drop(_1) -> bb4;                 // scope 0 at $DIR/issue-78442.rs:12:1: 12:2 } bb4 (cleanup): { -         drop(_1) -> bb5;                 // scope 0 at $DIR/issue-78442.rs:12:1: 12:2 +         resume;                          // scope 0 at $DIR/issue-78442.rs:7:1: 12:2 } -     bb5 (cleanup): { -         resume;                          // scope 0 at $DIR/issue-78442.rs:7:1: 12:2 +     bb5: { +         StorageDead(_5);                 // scope 0 at $DIR/issue-78442.rs:11:16: 11:17 +         StorageDead(_3);                 // scope 0 at $DIR/issue-78442.rs:11:16: 11:17 +         StorageDead(_4);                 // scope 0 at $DIR/issue-78442.rs:11:17: 11:18 +         StorageDead(_2);                 // scope 0 at $DIR/issue-78442.rs:11:17: 11:18 +         _0 = const ();                   // scope 0 at $DIR/issue-78442.rs:10:3: 12:2 +         drop(_1) -> [return: bb2, unwind: bb4]; // scope 0 at $DIR/issue-78442.rs:12:1: 12:2 } } </ins>

Related discussion:
text: Previously: Now: <!-- Thank you for finding an Internal Compiler Error! If possible, try to provide a minimal verifiable example. You can read "Rust Bug Minimization Patterns" for how to create smaller examples. --<!-- If you're using the stable version of the compiler, you should also check if the bug also exists in the beta or nightly versions. --: <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summary<strongBacktrace</strong</summary<p</p</details
Inlining exposes a use of unnormalized local in a call terminator (not sure if this is more of an issue with inlining or a validator): Note: revision annotation doesn't work in an auxiliary file (so it isn't tested on CI with mir-opt-level=2). modify labels: +A-mir-opt-inlining
This ICEs again because the fix was reverted Can someone reopen please?
Due to this new requires to trigger. <details<summaryICE:</summary</details
(FWIW can also trigger this: )
fixes this for and , but it still ICEs with on its own or with mir-opt-level 1/2 cc