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Match ergonomics 2024: implement mutable by-reference bindings Implements the mutable by-reference bindings portion of match ergonomics 2024 (#123076), with the `mut ref`/`mut ref mut` syntax, under feature gate `mut_ref`. r? `@Nadrieril` `@rustbot` label A-patterns A-edition-2024
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.