[AST/Sema] Add @extensible attribute on enum declarations
#80503
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xedin
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ahoppen,
bnbarham,
hamishknight,
rintaro,
artemcm,
xymus,
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tshortli,
CodaFi and
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@swift-ci please test |
xymus
reviewed
Apr 3, 2025
xymus
reviewed
Apr 3, 2025
xymus
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Apr 3, 2025
This attribute controls whether cross-module access to the declaration needs `@unknown default:` because it's allowed to gain new cases even if the module is non-resilient.
For now the semantics provided by `@extensible` keyword on per-enum basis. We might return this as an upcoming feature in the future with a way to opt-out.
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This attribute controls whether cross-module access to the declaration
needs
@unknown default:because it's allowed to gain new cases evenif the module is non-resilient.
The change also temporarily removes
ExtensibleEnumsexperimentalfeature.