Slava Pestov e9c255bfca Sema: Better fix for banning the '() -> T' => '() -> ()?' implicit conversion ...

Previously we would check TMF_UnwrappingOptional flag, which does not
stick with the constraint, so it would not always persist. Now, add a
new OptionalPayload locator element, which is more correct.

Fixes <rdar://problem/30429709>.

2017-02-13 16:59:09 -08:00

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