Becca Royal-Gordon d3c70053b5 Warn about async-imported selector conflicts ...

The change in #59479 inadvertently fixed another bug in selector conflict checking: Swift did not notice when an ObjC header declared an async-imported method, but a Swift extension to the same class added another method with the same selector. Unfortunately, fixing this bug was source-breaking, and it also caused Swift to diagnose spurious conflicts between the various names that a single ObjC method might be imported with. Soften the error to a warning in Swift 5 mode and suppress the spurious diagnostics.

Fixes rdar://95887113.

2022-06-28 02:05:02 -07:00

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