[5.1] Support unavailable and obsoleted attributes on extensions #26009
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Members of an extension inherit the availability of the extension. This was previously supported for introduced and deprecated, but not unavailable and obsoleted. rdar://problem/50949936
This change permits the use of unavailable types in unavailable signatures. It affects only usage of `available(*, unavailable)`. This fixes a compilation error in swift-corelibs-foundation/Foundation/ URLSession/URLSessionConfiguration.swift where an unavailable property was typed by an unavailable type.
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@swift-ci please test |
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Cherry-pick of #24997 for Swift 5.1.