[swift-evolution] Enums and Source Compatibility

[Jose Cheyo Jimenez]

Here is an alternative view. I've been thinking about this and I feel that instead of adding this to an enum why not make RawRepresentable structs a swift construct. 

You could declare it like this:

enum struct {
   case a, b, c
}

This would be a struct that acts like an enum but it is open like a RawRepresentable but using the enum case sugar. 

> On Sep 5, 2017, at 5:37 PM, Jordan Rose via swift-evolution <swift-evolution at swift.org> wrote:
> 
> It's in the "Alternatives Considered" section. :-) That was my desired design when we started, but feedback convinced me that the break from Swift 4 mode would be too drastic. The same valid code would have a different meaning whether you were writing Swift 4 or Swift 5.
> 
> Jordan
> 
> 
>> On Sep 5, 2017, at 17:30, Rod Brown <rodney.brown6 at icloud.com> wrote:
>> 
>> Hi Jordan,
>> 
>> I’m not sure how much bearing on this my comment will have.
>> 
>> Have you considered having only “exhaustive” as a keyword, and make the default non-exhaustive? It seems that “exhaustive" would be the rarer case, as it promises a lot more about compatibility (much like there is no such thing as “non-final”). Also, non exhaustive seems a massive mouthful despite it probably being the correct term.
>> 
>> - Rod
>> 
>>> On 6 Sep 2017, at 10:19 am, Jordan Rose <jordan_rose at apple.com> wrote:
>>> 
>>> I've taken everyone's feedback into consideration and written this up as a proposal: https://github.com/jrose-apple/swift-evolution/blob/non-exhaustive-enums/proposals/nnnn-non-exhaustive-enums.md. The next step is working on an implementation, but if people have further pre-review comments I'd be happy to hear them.
>>> 
>>> Jordan
> 
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