[6.2] AST: Tweak ConformanceLookupTable::compareConformances() some more #82447
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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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@swift-ci Please test |
bnbarham
approved these changes
Jun 24, 2025
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6.2 cherry-pick of #82446
Description: 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.
Scope of the issue: This allows declaring a type that conforms to a protocol that inherits from SendableMetatype, followed by an unavailable Sendable conformance on the same type.
Risk: Low. Might break availability checking in some edge case, perhaps.
Radar: rdar://152509409.
Reviewed by: @AnthonyLatsis