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

[Shawn Erickson]

Ensure(TM) ...has a little much sugar for my wants in a drink

I get and like the suggestion from a grammar pov however guard is a little
more forceful in terminology which aligns with the fact that you cannot
proceed past the guard unless the condition is met. (I have a vision of a
little guard standing at his guard post checking papers)

-Shawn

On Mon, Feb 22, 2016 at 9:01 AM 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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