Allan Shortlidge c06b35c3d0 Sema: Avoid crashing in diagnoseDeclAsyncAvailability() when call expr cannot be determined. ...

The `call` argument to `diagnoseDeclAsyncAvailability()` may be `nullptr` when the structure of the AST prevents `getEnclosingApplyExpr()` from finding the enclosing apply. The diagnostics implementation introduced with https://github.com/apple/swift/pull/60663 needs to tollerate this, similar to the rest of `diagnoseDeclAsyncAvailability()`.

Resolves rdar://100862513

2022-10-06 17:16:46 -07:00

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