[swift-evolution] [Draft] Mixins

[Step C]

It would be helpful if you include the new draft. Or at least a link to it.

> On Feb 28, 2016, at 3:30 PM, Антон Жилин via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I have rewritten almost the whole proposal in the last 10 hours. I encourage everyone interested to reread it and suggest fixes, improvements, as well as new directions for discussion.
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