[swift-evolution] [proposal] Either in the Swift Standard Library

[Chris Lattner]

> On Jan 27, 2016, at 10:09 PM, Thorsten Seitz via swift-evolution <swift-evolution at swift.org> wrote:
> 
> As an alternative to Either for expressing a sum type I'd like to throw real union types like Ceylon uses into the discussion.
> 
> http://ceylon-lang.org/documentation/1.2/tour/types/ <http://ceylon-lang.org/documentation/1.2/tour/types/>
FWIW, this has been discussed before on swift-evolution.  Adding them isn’t out of the question, but it is a lot more complicated than it looks for the type checker.

-Chris

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