[swift-evolution] Rename 'guard' to 'ensure'

[Haravikk]

I’m not strictly against the proposal, but I don’t think that renaming to ensure adds anything.

guard is essentially a neat feature for programming defensively, so guard to me is stronger fit thematically in that sense.

> On 19 Feb 2016, at 21:49, John Flanagan via swift-evolution <swift-evolution at swift.org> wrote:
> 
> The functionality of ‘guard’ is great and this proposal has nothing to do with changing that. The only suggestion is that the word ‘ensure’ would better communicate what a ‘guard’ statement does to those encountering it for the first time and would make code more readable in general.
> 
> Example:
> 
> ensure foo != nil else {
>    return;
> }
> 
> -John
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