Doug Gregor e595b4f68a [SE-0306] Ban "open" and "required" on actors. ...

Because actors don't have inheritance, ban "open" and "required", which
don't make sense. We will permit "final" which, although it doesn't
have any semantic impact, is still used to determine whether the ABI
of the actor itself might permit subclassing in the future. This
leaves the door slightly ajar for actor inheritance should we need to
revisit that decision.

Fixes SR-14785 / rdar://79401150.

2021-06-30 16:34:18 -07:00

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