Doug Gregor b5cce1f694 [SE-0466] Don't infer @MainActor on types conforming to Sendable ...

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

2025-06-27 15:14:26 -07:00

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