[6.2] Diagnose isolated conformance to SendableMetatype-inheriting protocol #82848
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…ing protocol An isolated conformance to a SendableMetatype-inheriting protocol cannot actually be used in generic code, because the SendableMetatype requirement itself prevents it. Warn about this case so folks aren't surprised at runtime. This is a part of issue swiftlang#82550 / rdar://154437489.
…to error Forming an isolated conformance to a SendableMetatype-inherting protocol opens up a soundness hole any time the conformance is used. Reword the recently-introduced diagnostic for this case and promote it to an error (except when it's preconcurrency). Fixes rdar://154808002.
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@swift-ci please test |
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@swift-ci please test |
tbkka
approved these changes
Jul 8, 2025
DougGregor
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isolated-conformance-to-sendablemetatype-proto-error-6.2
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SendableMetatype-inheriting protocol breaks the soundness model of isolated conformances, so produce an error on such conformances.