[AST/Sema] Add @preEnumExtensibility attribute to downgrade warning…
#81176
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…s 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`.
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…s for extensible enums
Just like
@preconcurrencyfor concurrency, this attribute is going to allow exhaustiveness error downgrades for enums that were retroactively marked as@extensible.