Pavel Yaskevich ddaccf88bb [QoI] Properly diagnose closure parameter distructuring after SE-0110 ...

Swift 3 supported limited argument destructuring when it comes to
declaring (trailing) closures. Such behavior has been changed by
SE-0110. This patch aims to provide better error message as well
as fix-it (if structure of the expected and actual arguments matches)
to make the migration easier and disambiguate some of the common
mistakes.

Resolves: SR-4738, SR-4745, rdar://problem/31892961.

2017-05-08 23:04:37 -07:00

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