Slava Pestov 044af751f3 Sema: Fix a failure to emit a diagnostic ...

CSDiag was misinterpreting the result of checkGenericArguments().

A result of SubstitutionFailure does not mean a diagnostic was
emitted, only a result of Failure means that. This fixes a case
where we did not emit a diagnostic, result in a crash on invalid.

The diagnostic is still poor, but that's better than crashing.

Fixes <https://bugs.swift.org/browse/SR-5932>,
<rdar://problem/34522739>.

2017-09-27 16:39:06 -07:00

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