[swift-evolution] [Pre-Proposal-Discussion] Union Type - Swift 4

[Chris Lattner]

> On Aug 10, 2016, at 8:15 PM, Xiaodi Wu via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I don't know if the core team feels differently now with respect to Swift 4, but union types are listed as a "commonly rejected change":
> 
> https://github.com/apple/swift-evolution/blob/master/commonly_proposed.md <https://github.com/apple/swift-evolution/blob/master/commonly_proposed.md>

There is no change in opinion here.  This topic is also out of scope for Swift 4 stage 1 in any case.

-Chris
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