This is the same issue as when a library maintainer changes a class from open 
to closed.

> On Jan 5, 2018, at 10:54 AM, Ignacio Soto via swift-evolution 
> <swift-evolution@swift.org> wrote:
> 
> I love the revision to the proposal 
> <https://github.com/apple/swift-evolution/pull/777>, but I have a couple of 
> remaining questions that don't seem to be addressed in the doc and I'm 
> curious about:
> What happens if a library maintainer adds a new case to a @frozen enum?
> What happens if a library maintainer changes an enum from @frozen to 
> non-frozen?
> Thanks!
> 
> 
> -- 
> Ignacio Soto
> _______________________________________________
> swift-evolution mailing list
> swift-evolution@swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution

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