Joe Groff 6db85203db SIL: Abstraction pattern support for multiple foreign async returns. ...

An ObjC API maybe imported as async that had multiple non-error arguments to
its completion handler, which we treat in Swift as returning a tuple. Use a new
form of abstraction pattern to represent this return type, to maintain the
correct relation between individual tuple elements and the Clang block parameter
types they map to.

2020-11-12 16:53:21 -08:00

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