[swift-evolution] Abstract methods

[Tino Heth]

> to me protocol extensions are both cool and evil. cool as you can add code. evil because it's more natural to add another declarations in those extensions rather than implementation:
> 
> protocol Foo {
>     func foo()
> }
> 
> extension Foo {
>    func bar()    //*** natural assumption is that i can do this. but i can't
> }
After a moment of reflection, I think I understand your reasoning — but why should you want to do this?
Imho splitting types with extensions is already overused quite often, but splitting a protocol makes no sense for me at all.
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