AST: Tweak ConformanceLookupTable::compareConformances() some more #82446
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If two conformances imply a conformance to the same marker protocol, don't diagnose redundancy if they differ by unavailability. Instead, allow the more available conformance to win. This allows declaring a type that conforms to a protocol that inherits from SendableMetatype, followed by an unavailable Sendable conformance on the same type. Fixes rdar://152509409.
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AnthonyLatsis
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Jun 24, 2025
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If two conformances imply a conformance to the same marker protocol, don't diagnose redundancy if they differ by unavailability. Instead, allow the more available conformance to win.
This allows declaring a type that conforms to a protocol that inherits from SendableMetatype, followed by an unavailable Sendable conformance on the same type.
Fixes rdar://152509409.