[swift-evolution] Guard Implicit Fallback

[Jessy Catterwaul]

The first related thought I had was answered by Chris Lattner:

https://forums.developer.apple.com/thread/4857

Does this proposal represent “code clarity”? Yes, I think so. Either guard must be paired with an “else”, or the else clause is the obvious, which is normally a return:

func ƒ<A, B, C>(a: A?, b: B?, c: C?) {
   guard let a = a, b = b, c = c else {return}
}

This is better:
guard let a, b, c

But what should it be in a loop? break? continue? I don’t think return would be appropriate. Not that I escape loops very often anymore; return is obvious for “forEach”, because it can’t “continue” or “break”.
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