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Rollup merge of #119967 - ShE3py:patkind-err, r=WaffleLapkin

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Add `PatKind::Err` to AST/HIR

#116715 added `thir::PatKind::Error`; this PR adds `hir::PatKind::Err` and `ast::PatKind::Err` (see https://github.com/rust-lang/rust/pull/118625#discussion_r1446587901.)

---

``@rustbot`` label +A-patterns
r? WaffleLapkin
This commit is contained in:
Matthias Krüger 2024-01-18 10:34:18 +01:00 • committed by GitHub
commit 1f93d2b411
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23 changed files with 66 additions and 24 deletions
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compiler/rustc_lint/src/unused.rs
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@ -1166,7 +1166,7 @@ impl EarlyLintPass for UnusedParens {
// Do not lint on `(..)` as that will result in the other arms being useless.
Paren(_)
// The other cases do not contain sub-patterns.
| Wild | Never | Rest | Lit(..) | MacCall(..) | Range(..) | Ident(.., None) | Path(..) => {},
| Wild | Never | Rest | Lit(..) | MacCall(..) | Range(..) | Ident(.., None) | Path(..) | Err(_) => {},
// These are list-like patterns; parens can always be removed.
TupleStruct(_, _, ps) | Tuple(ps) | Slice(ps) | Or(ps) => for p in ps {
self.check_unused_parens_pat(cx, p, false, false, keep_space);