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Pavel Yaskevich cefa0b2fbf [AST/Sema] Add @preEnumExtensibility attribute to downgrade warnings for extensible enums
Just like `@preconcurrency` for concurrency, this attribute is going
to allow exhaustiveness error downgrades for enums that were retroactively
marked as `@extensible`.

(cherry picked from commit 498430afaf)
2025-08-18 23:58:03 -07:00
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