[Concurrency] Don't allow non-Sendable, isolated closures to capture non-Sendable values that may be isolated to a different actor.
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non-Sendable values that may be isolated to a different actor.
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If a closure is not
Sendable, its isolation differs from its enclosing context, and both contexts are actor isolated, treat the closure as if it may execute concurrently. Otherwise, the closure may capture non-Sendablestate from the outer context and stash it into isolated state on a different actor, allowing for concurrent access later on.See https://forums.swift.org/t/should-global-actor-isolated-functions-be-implicitly-sendable/60553/9 for more details.