[swift-evolution] [Draft] Mixins

Sat Feb 27 03:59:00 CST 2016

Some people opposed to Abstract Classes proposal (including myself) have
said that mixins could solve the problem better.
So I prepaired a proposal draft to add stored properties to protocols. Here
it is:
https://gist.github.com/Anton3/f0550922c1be0fc5447c

P.S. I added a `mixin` keyword in the beginning, but we can opt to just
extend protocols, which I mention in "alternatives".
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