Allan Shortlidge 98b34c6ff6 Sema: Correctly treat overloads in unavailable extensions as unavailable. ...

Instead of checking for unavailability attributes directly in the solver, which
does not correctly handle members of unavailable extensions, query
`checkDeclarationAvailability()` instead. By using the same underlying logic as
the availability checker the constraint solver can be confident in the accuracy
of this result.

Resolves rdar://87403752.

2024-11-02 17:15:11 -07:00

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