[SE-0470] Promote isolated-conformance-to-sendable-metatype protocol to an error #82846
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…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.
DougGregor
requested review from
ktoso,
hborla,
slavapestov and
xedin
as code owners
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slavapestov
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Jul 7, 2025
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DougGregor
deleted the
isolated-conformance-to-sendablemetatype-proto-error
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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.