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

[John Flanagan]

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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