Doug Gregor d607d3a068 [Constraint system] Custom diagnostics for failed pattern matches. ...

Extend the constraint system’s diagnostics with specific handling for
matching an enum element pattern that has a subpattern (i.e., to capture
associated values) against an enum case that does not have any associated
value. This brings diagnostics for the new code path on par with the existing
diagnostics of coercePatternToType.

2020-02-24 00:48:15 -08:00

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