[swift-evolution] [Proposal] Enum subsets

[Chris Lattner]

> On Jun 3, 2016, at 2:35 PM, T.J. Usiyan via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Since this seems to have some interest, I've made a gist.
> 
> https://gist.github.com/griotspeak/963bc87a0c244c120264b11fb022d78c <https://gist.github.com/griotspeak/963bc87a0c244c120264b11fb022d78c>
We have frequently discussed introducing subtype relationships between structs and enums, in an effort to allow limited implicit promotions (e.g. from small integers to wider integers).  Wouldn’t that be a more general solution to this same problem?

-Chris

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