Doug Gregor 59ee97f4af [SE-0143] Try harder to substitute conditional requirements fully. ...

When forming a specialized protocol conformance, we substitute into the
conditional requirements. Allow this substitution to look into the module
to find conformances, which might be required to accurately represented
the requirements. Otherwise, we can silently end up dropping them.

We should rethink this notion of eagerly substituting conditional
requirements, and consider whether clients should always handle this
substitution. For now, fixes rdar://problem/35837054.

Allow conformance lookup in module context for conditional

2017-12-04 15:02:56 -08:00

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