Jordan Rose 19af8a124c Re-apply "If a function conversion fails, suggest wrapping in a closure." ...

This re-applies r24987, reverted in r24990, with a fix for a spuriously-
introduced error: don't use a favored constraint in a disjunction to avoid
applying a fix. (Why not? Because favoring bubbles up, i.e. the
/disjunction/ becomes favored even if the particular branch is eventually
rejected.) This doesn't seem to affect the outcome, though: the other
branch of the disjunction doesn't seem to be tried anyway.

Finishes rdar://problem/19600325

Swift SVN r25054

2015-02-06 23:12:54 +00:00

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