Doug Gregor d12dbf99ea [Type checker] Diagnose failed attempts to resolve associated type witnesses. ...

If unqualified name lookup finds an associated type, but resolution to
the type witness fails, produce a diagnostic rather than silently
failing. Fixes the crash in SR-5825, SR-5881, and SR-5905.

It's conceivable that we could resolve this with suitably global
associated type inference... but that's far off and it's best not to
crash until then.

2017-10-03 21:59:14 -07:00

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