AST: Use availability to control decl visibility in public swiftinterfaces #84107
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…erfaces. All supported compilers can now parse `@available` attributes that reference custom availability domains.
This is meant to make it clearer how exceptions for each `DisallowedOriginKind` are handled.
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…faces. Declarations that are unavailable at runtime because of an `@available` attribute referencing a custom domain that was imported `@_spiOnly` should be hidden from public swiftinterface files in `-library-level=api` modules. For remaining declarations that do get printed in the public swiftinterface, skip printing any `@available` attribute that refers to the domains from those `@_spiOnly` dependencies. This allows API developers to control declaration visibility using availability defined by another module. Resolves rdar://156512028.
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Declarations that are unavailable at runtime because of an
@availableattribute referencing a custom domain that was imported@_spiOnlyshould be hidden from public swiftinterface files in-library-level=apimodules. For remaining declarations that do get printed in the public swiftinterface, skip printing any@availableattribute that refers to the domains from those@_spiOnlydependencies. This allows API developers to control declaration visibility using availability defined by another module.Resolves rdar://156512028.