[swift-evolution] [Proposal] Union Type

[Chris Lattner]

> On Jul 1, 2016, at 2:06 AM, Cao Jiannan via swift-evolution <swift-evolution at swift.org> wrote:
> 
> https://github.com/frogcjn/swift-evolution/blob/master/proposals/xxxx-union-type.md <https://github.com/frogcjn/swift-evolution/blob/master/proposals/xxxx-union-type.md>
> 
> Hi,
> 
> I'm now officially proposal the union type feature for Swift. Please see:

FYI, this is clearly out of scope for Swift 3.  Please wait until Swift 3 is wound down before bringing this up.  Also beware that this topic has come up several times before and there are major semantic problems with it.  Please familiarize yourself with those previous discussions.

-Chris
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