[swift-evolution] [Pitch] merge types and protocols back together with type<Type, Protocol, ...>

[Austin Zheng]

I'd like to take a shot at writing such a proposal. At some point improved
existential support will need to go through review, so we might as well.

Austin

On Tue, May 17, 2016 at 11:02 AM, Douglas Gregor via swift-evolution <
swift-evolution at swift.org> wrote:

>
> On May 17, 2016, at 10:40 AM, Adrian Zubarev <
> adrian.zubarev at devandartist.com> wrote:
>
> You don’t seem to be tackling the case of “A Collection whose Element type
> is String”. If we’re generalizing the current “protocol<>” notion, why not
> make it as powerful as a generic signature, with the ability to specify
> same-type constraints and conformances on associated types?
>
> - Doug
>
>
> Which part of the manifesto did I left out? ^^ Could you provide a quick
> pseudo code example?
>
> Do you mean something like `Any<Collection where Element == String>`? I’m
> not sure where I should consider such a scenario, maybe at future
> directions?
>
>
> That’s the part I’m referring to, yes. I just realized that your proposal
> isn’t lifting the restrictions on protocols with Self types or associated
> types, so my suggestion doesn’t make sense for your proposal without a
> significant increase in scope.
>
> - Doug
>
>
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