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Try to fix constraint system in a way where member reference is going to be defined in terms of its use, which makes it seem like parameters match arguments exactly. Such helps to produce solutions and diagnose failures related to missing members precisely. These changes would be further extended to diagnose use of unavailable members and other structural member failures. Resolves: rdar://problem/34583132 Resolves: rdar://problem/36989788 Resolved: rdar://problem/39586166 Resolves: rdar://problem/40537782 Resolves: rdar://problem/46211109