[AST/Sema] SE-0478: Implement `using` declaration under an experimental flag#81863

Merged

xedin merged 14 commits intoswiftlang:mainfrom

xedin:using-for-default-isolation-in-file-context

Jun 2, 2025

Commits on May 31, 2025

[Parse] Implement parsing for `using` declarations
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[Tests] NFC: Rename a few Cxx tests to use `.cpp` extension instead of `.swift`
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[Concurrency] Add a request to retrieve default isolation of a file
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[AST] Don't print `using` declarations in swift interfaces
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[AST/Sema] Hide `using` declaration behind `DefaultIsolationPerFile` experimental feature
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[Concurrency] Start using default isolation set in a file scope
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[Diagnostics] Tailor `using` diagnostic to current use-case - default isolation
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[AST] NFC: Capitalize `UsingSpecifier::nonisolated` for consistency
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[TypeChecker] Disable use of `using` in macro extensions
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[Serialization] Prevent `using` declarations from being serialized
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