Joe Groff 7eaa507ced Sema: Ban single-labeled element tuples harder. ...

The prohibition in Swift 3.0 missed the case where the single-element tuple was wrapped in extra parens as the only argument of a function. We've ripped out parts of the type checker that try to cope with single-element tuples, and it would be risky and bug-prone to try to admit this code, so it's better to fix the ban than to try to accept the code, alas. Fixes SR-3788.

2017-02-06 13:54:32 -08:00

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