"nonisolated deinit" does not have back-deployment constraints #82584
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Fixes rdar://154373088 / issue swiftlang#82523
When the default isolation is main-actor, don't infer @mainactor for a type that conforms to a protocol P in its primary definition when P inherits from Sendable. Such types should remain non-isolated because they're highly unlikely to be able to implement the P conformance (which cannot be isolated). Put this feature behind a new experimental flag, SendableProhibitsMainActorInference. Implements rdar://151029300
Fixes rdar://150484159
DougGregor
requested review from
ktoso,
slavapestov,
hborla,
xedin and
jckarter
as code owners
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Fixes rdar://150484159