Michael Gottesman 91209d311d [concurrency] Ban associated objects from being set on instances of actor classes that do not inherit from NSObject. ...

Associated objects are actively dangerous there because they’re non-isolated
actor state, and it’s “new” code wher no backward compatibility concerns that
make it more difficult to ban this on other forms of classes.

rdar://69769048

2020-11-27 14:48:51 -08:00

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