[swift-evolution] Enums and Source Compatibility

Jordan Rose jordan_rose at apple.com
Tue Sep 12 19:54:47 CDT 2017

Sorry, I got distracted by other tasks! Both the discussion here and within Apple has moved towards making "non-exhaustive" the default, which, to be honest, I too think is the best design. I'll update the proposal today to reflect that, though I still want to keep both the "nonexhaustive" and "exhaustive" keywords for Swift 4 compatibility for now (or whatever we end up naming them). The compatibility design is a little less ambitious than Brent's; as currently proposed, Swift 4 mode continues to default to 'exhaustive' all the time, even in the actual Swift 5 release.

I still want to respond to Brent's points directly, but I think you and Vladimir have done a good job discussing them already. I'll send out the updated proposal tomorrow, after I have a little more time to think about #invalid.

Thanks for putting time into this!

> On Sep 9, 2017, at 17:34, Rod Brown <rodney.brown6 at icloud.com> wrote:
> Jordan,
> Do you have any other thoughts about the ongoing discussion here, especially regarding Chris’ comments? As you’re the one pushing this forward, I’d really like to know what your thoughts are regarding this?
> - Rod

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