Mark Lacey 5a498db041 [TypeChecker] Fix a problem with rethrows classification. ...

We failed to properly classify arguments that are of optional function
type, in this case leading to a verification failure due to the throws
attribute on the apply expression not being set to some value.

Fixes: SR-9102 / rdar://problem/45615204

2018-11-30 13:28:04 -08:00

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