AST: Introduce an "always enabled" custom availability domain kind #84240
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An always enabled availability domain is implicitly available in all contexts, so uses of declarations that are marked as `@available` in the domain are never rejected. This is useful for an availability domain representing a feature flag that has become permanently enabled. Partially resolves rdar://157593409.
Resolves rdar://157593409.
tshortli
requested review from
AnthonyLatsis,
artemcm,
jckarter and
rjmccall
as code owners
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An always enabled availability domain is implicitly available in all contexts, so uses of declarations that are marked as
@availablein the domain are never rejected. This is useful for an availability domain representing a feature flag that has become permanently enabled.Resolves rdar://157593409.