Doug Gregor b6210f7daf Start substituting type variables through protocol conformances. ...

This eliminates a class of strange type checking failures involving
generics. The actual example is from <rdar://problem/15772601>, but
this also addresses <rdar://problem/15268030> and the root problem,
<rdar://problem/15168483>.

Swift SVN r12974

2014-01-26 22:38:45 +00:00

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