Doug Gregor 866a8d8944 Introduce checking for ConcurrentValue conformance across actors. ...

When referring to an actor-isolated declaration from outside of the
actor, ensure that the types involved conform to the `ConcurrentValue`
protocol. Otherwise, produce a diagnostic stating that it is unsafe to
pass such types across actors.

Apply the same rule to local captures within concurrent code.

2021-02-03 17:37:43 -08:00

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