> On Jan 12, 2018, at 3:08 PM, Jordan Rose <jordan_r...@apple.com> wrote:
> 
> Okay, I went back to `unknown case` in the proposal, but mentioned Chris's 
> point very specifically: if the compiler emits an error, we should go with 
> `case #unknown` instead. (I'm very strongly in the "warning" camp, though.)

Thanks!

Out of curiosity, why not “unknown default:”?  The “warning” behavior is a 
customization of default, so this seems like a more logical model.  It also 
fits into the existing Swift grammar, unlike “unknown case:” which requires 
adding a new special case production.

-Chris

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