Joe Groff 3edaa70c28 Augment ForeignAsyncConvention with fields for completion handler flag params. ...

When the requisite support in Clang for `__attribute__((swift_async_error))` parameters
lands, this will let us represent APIs that take completion handlers in the general shape
of `void (^)(BOOL, id, NSError*)`, where the boolean argument indicates the presence of
an error rather than the nilness of the `NSError*` argument.

2021-02-11 13:38:30 -08:00

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