Doug Gregor 493d4da667 Warn on “near-misses” when defaults are used for protocol witnesses. ...

When a particular nominal type or extension thereof declares conformance
to a protocol, check whether that type or extension contains any members
that *nearly* match a defaulted requirement (i.e., a requirement that 
is satisfied by something in a protocol extension), but didn’t match
for some reason and weren’t used to satisfy any other requirement of
that protocol. It’s intended to catch subtle mistakes where a default
gets picked instead of the intended member.

This is a generalization of the code we’ve had for @objc optional
requirements for a long time.

Fixes rdar://problem/24714887.

2017-10-26 17:04:46 -07:00

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