[swift-evolution] [Idea] return if / return unless

[Brent Royal-Gordon]

> On Aug 4, 2016, at 6:38 AM, Julian Dunskus via swift-evolution <swift-evolution at swift.org> wrote:
> 
> return nil unless let thing = things[index]

On the `unless` part, at least, see the "Rename guard to unless" section in Commonly Rejected Changes: <https://github.com/apple/swift-evolution/blob/master/commonly_proposed.md>

-- 
Brent Royal-Gordon
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