[6.2] Sema: Relax diagnosis of implied marker protocol conformances with mismatched availability #82310
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…smatched availability This logic was introduced in swiftlang#75135. The intent was to prevent an implied conformance from overriding an existing unavailable one, for example in the case of Sendable. Let's relax this check a bit to only diagnose if the mismatch is in the unconditional availability, and not OS version. Fixes rdar://142873265.
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@swift-ci Please test |
hborla
approved these changes
Jun 17, 2025
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6.2 cherry-pick of #82308
Description: Fix a spurious "redundant
Sendableconformance" warning when two conformances with different availability both implied a conformance to Sendable.Origination: This check was introduced in [ConformanceLookup] Don't allow skipping inherited unavailable conformances in favor of explicit available ones. #75135. The intent was to prevent an implied Sendable conformance from overriding an existing unavailable Sendable conformance. This change just relaxes the check to only consider unconditional unavailability.
Radar: Fixes rdar://142873265.
Tested: New tests added. (The FIXME mentioned is an existing problem and not a regression.)
Reviewed by: @hborla