29e32120c3
or_patterns: implement :pat edition-specific behavior cc #54883 `@joshtriplett` This PR implements the edition-specific behavior of `:pat` wrt or-patterns, as determined by the crater runs and T-lang consensus in https://github.com/rust-lang/rust/issues/54883#issuecomment-745509090. I believe this can unblock stabilization of or_patterns. r? `@petrochenkov`
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