[swift-evolution] [Idea] Deprecate the 'default' keyword.

[Tim Vermeulen]

I kinda like Haskell’s “otherwise”, and it’s move obvious what it means than “default” from an English language point of view.

> Let's make this a topic of its own.
> 
> As mentioned recently in the '[Idea] Allowing most keywords after "."' thread, the 'default' keyword is only used as a keyword in switch statements, where it's synonymous with 'case _:'.
> It's also the kind of word which appears commonly in enums.
> 
> So, why do we need to keep it as a keyword?
> 
> Disadvantages: there would be some breaking of code, but a migration tool should have little difficulty replacing 'default:' with 'case _:' in all cases.
> 
> Alternatives: replace 'default' with 'else'._______________________________________________
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