[swift-evolution] [Pitch] Moving where Clauses Out Of Parameter Lists

[Pyry Jahkola]

> Joe Groff wrote:
> 
> It's a judgment call. It's my feeling that in many cases, a generic parameter is constrained by at least one important protocol or base class that's worth calling out up front, so it's reasonable to allow things like 'func foo<C: Collection>(x: C) -> C.Element' without banishing the 'Collection' constraint too far from the front of the declaration.

Fair enough. I think it would be clearer if all the constraints appeared in one standard place (in the `where` clause).

— Pyry
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