Hamish Knight d6d8d08608 [CS] Better diagnose conformance failures for EnumElementPatterns ...

Previously we could end up with a
ContextualMismatch fix and a MissingConformance fix
for different elements of the `matchTypes` disjunction,
leading to an ambiguity. Instead, avoid recording
the ContextualMismatch if we're matching an
existential, and tweak the MissingConformance
failure to have a custom diagnostic for
EnumElementPattern matching.

2024-07-15 12:47:50 +01:00

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