ICE in the face of malformed code

[estebank]

Code

fn enum_upvar() {
    type T = impl Copy;
    let foo: T = Some((1u32, 2u32));
    let x = move || {
        match foo {
            None => (),
            Some(yield) => (),
        }
    };
}

fn main() {}

Meta

rustc --version --verbose:

rustc version: 1.81.0-nightly (5affbb171 2024-07-18)
platform: x86_64-unknown-linux-gnu

Error output

error: expected identifier, found reserved keyword `yield`
 --> f94.rs:7:18
  |
7 |             Some(yield) => (),
  |                  ^^^^^ expected identifier, found reserved keyword
  |
help: escape `yield` to use it as an identifier
  |
7 |             Some(r#yield) => (),
  |                  ++

error[E0658]: `impl Trait` in type aliases is unstable
 --> f94.rs:2:14
  |
2 |     type T = impl Copy;
  |              ^^^^^^^^^
  |
  = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
  = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable
  = note: this compiler was built on 2024-07-18; consider upgrading it if it is out of date

warning: unused variable: `x`
 --> f94.rs:4:9
  |
4 |     let x = move || {
  |         ^ help: if this is intentional, prefix it with an underscore: `_x`
  |
  = note: `#[warn(unused_variables)]` on by default

thread 'rustc' panicked at compiler/rustc_mir_build/src/build/matches/mod.rs:1819:44:
called `Option::unwrap()` on a `None` value

rust/compiler/rustc_mir_build/src/build/matches/mod.rs

Lines 1814 to 1815 in 411fcb6

	// Unwrap is ok after simplification.
	let match_place = match_pair.place.unwrap();

Backtrace attached

rustc-ice-2024-07-19T17_25_21-3933070.txt

[estebank]

cc @Nadrieril

[matthiaskrgr]

duplicate of #119786