Various never type test improvements #149541
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r? @SparrowLii rustbot has assigned @SparrowLii. Use |
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We used to allow `T -> !` coercions (yes!! not `! -> T`) in unreachable code. This was later removed during 2018 stabilization attempt, see: - rust-lang#40800 - rust-lang@59688e1 - rust-lang#46325 I've kept `tests/ui/coercion/coerce-to-bang-cast.rs`, as that is a reasonable test for us *not* having `-> !` coercions.
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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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Duplicate of `from_infer_breaking_with_unit_fallback.rs` and `question_mark_from_never.rs`
I don't think they are testing anything anymore
there are only 1 test in that directory, probably created by mistake.
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I want to make sure that the never type ui tests are actually sensible, and to do so I'm trying to clean them up. This mainly adds comments explaining test purposes and removes outdated stuff.
I imagine best reviewed commit-by-commit, I tried to write useful descriptions and group things into small commits.
cc @lcnr (I removed
fallback/nofallbackterminology in b5f82d4)