Files
rust/tests/ui
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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UI Tests

This folder contains rustc's UI tests.

Test Directives (Headers)

Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and intepret a test.

As part of an on-going effort to rewrite compiletest (see https://github.com/rust-lang/compiler-team/issues/536), a major change proposal to change legacy compiletest-style headers // <directive> to ui_test-style headers //@ <directive> was accepted (see https://github.com/rust-lang/compiler-team/issues/512.

An example directive is ignore-test. In legacy compiletest style, the header would be written as

// ignore-test

but in ui_test style, the header would be written as

//@ ignore-test

compiletest is changed to accept only //@ directives for UI tests (currently), and will reject and report an error if it encounters any comments // <content> that may be parsed as an legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.