Doug Gregor 77584928da [Concurrency] Implement global actor isolation rules. ...

Extend the actor isolation checking rules to account for global
actors. For example, a function annotated with a given global actor
can invoke synchronous methods from the same global actor, but not
from a different global actor or a particular actor instance.
Similarly, a method of an (instance) actor that is annotated with a
global actor attribute is not part of the (instance) actor and,
therefore, cannot operate on its actor-isolated state.

2020-10-09 15:20:01 -07:00

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