Files
rust/tests/crashes
Matthias Krüger aeb4c0413c Rollup merge of #124394 - gurry:123863-ice-unexpected-region, r=lcnr
Fix ICE on invalid const param types

Fixes ICE #123863 which occurs because the const param has a type which is not a `bool`, `char` or an integral type.

The ICEing code path begins here in `typeck_with_fallback`: https://github.com/rust-lang/rust/blob/cb3752d20e0f5d24348062211102a08d46fbecff/compiler/rustc_hir_typeck/src/lib.rs#L167

The `fallback` invokes the `type_of` query and that eventually ends up calling `ct_infer` from the lowering code over here:
https://github.com/rust-lang/rust/blob/cb3752d20e0f5d24348062211102a08d46fbecff/compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs#L561 and `ct_infer` ICEs at this location: https://github.com/rust-lang/rust/blob/cb3752d20e0f5d24348062211102a08d46fbecff/compiler/rustc_hir_analysis/src/collect.rs#L392

To fix the ICE it I'm triggering a `span_delayed_bug` before we hit `ct_infer` if the type of the const param is not one of the supported types

### Edit
On `@lcnr's` suggestion I've changed the approach to not let `ReStatic` region hit the `bug!` in `ct_infer` instead of triggering a `span_delayed_bug`.
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This is serves as a collection of crashes so that accidental ICE fixes are tracked. This was formally done at https://github.com/rust-lang/glacier but doing it inside the rustc testsuite is more convenient.

It is imperative that a test in the suite causes an internal compiler error/panic or makes rustc crash in some other way. A test will "pass" if rustc exits with something other than 1 or 0.

When adding crashes from https://github.com/rust-lang/rust/issues, the issue number should be noted in the file name (12345.rs should suffice) and perhaps also inside the file via //@ known-bug #4321

If you happen to fix one of the crashes, please move it to a fitting subdirectory in tests/ui and give it a meaningful name. Also please add a doc comment at the top of the file explaining why this test exists. :) Adding Fixes #NNNNN Fixes #MMMMM to the description of your pull request will ensure the corresponding tickets will be closed automatically upon merge. The ticket ids can be found in the file name or the known-bug annotation inside the testfile.