Files
rust/tests/crashes
Matthias Krüger 1ee6345b7b Rollup merge of #127409 - gurry:127332-ice-with-expr-not-struct, r=oli-obk
Emit a wrap expr span_bug only if context is not tainted

Fixes #127332

The ICE occurs because of this `span_bug`: https://github.com/rust-lang/rust/blob/51917e2e69702e5752bce6a4f3bfd285d0f4ae39/compiler/rustc_hir_typeck/src/expr_use_visitor.rs#L732-L738
which is triggered by the fact that we're trying to use an `enum` in a `with` expression instead of a `struct`.

The issue originates in commit https://github.com/rust-lang/rust/pull/127202/commits/814bfe9335fd7c941169e0ef15ae2cffeacc78eb   from PR #127202. As per the title of that commit the ICEing code should not be reachable any more, but looks like it still is.

This PR changes the code so that the `span_bug` will be emitted only if the context is not tainted by a previous error.
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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.