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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
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.