[swift-evolution] [pitch] rename 'guard' to 'ensure'

[David Sweeris]

> On Oct 27, 2016, at 08:21, Jay Abbott <jay at abbott.me.uk> wrote:
> 
> You’re really in pun mode today, David! :)
> 
It's the best mode 😎

> But I do really like Marco’s suggestion of guard: because it changes the interpretation…
> 
> guard: x > 0 else { return }
> This now reads as: This is a guard: x must be greater than zero, otherwise return. The only issue is it has the same syntax as a break-label so becomes potentially ambiguous/confusing. Is there another way that could be achieved?
> 
The ambiguity could be resolved by disallowing keywords as labels. I don't use them much, though, so I'm not sure how much that would affect readability.

- Dave Sweeris

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