[swift-evolution] Pitch: disallow `()` from Switch statement case satisfaction

[Haravikk]

> On 11 Oct 2016, at 19:43, Erica Sadun via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I thought this was long gone but today I found out it is still legal:
> 
> switch i {
> case 4 ... 6: ()
> case 3: print("Here")
> default: break
> }
> 
> Is there a motivating factor for keeping this in the language? The compiler picks up on Void and emits an error. You'd think () would produce the same results but it doesn't.
> 
> — Erica

Hopefully I'm not the only one but… how are we supposed to be doing this? Because () is exactly what I've been using the entire time for cases that I want to ignore (or are handled in code outside the switch). I'm going to have a few dozen files to edit if there's something else I'm supposed to be using… 
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