See Conditional Conformances via Protocol Extensions
<https://github.com/apple/swift/blob/master/docs/GenericsManifesto.md#conditional-conformances-via-protocol-extensions>.
> On Dec 6, 2017, at 11:05 AM, Cao, Jiannan via swift-dev <swift-dev@swift.org>
> wrote:
>
> Recently, we can use conditional conformances for struct/class.
>
>> extension Array: Equatable where Self.Element : Equatable { ... }
>
>
> Could we use conditional conformances for protocols?
> For example:
>
>> extension Collection : Equatable where Self.Element : Equatable { ... }
>
>
> Thanks!
> Jiannan
>
>
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