[swift-evolution] protocol can only be used as a generic constraint because it has Self or associated type requirements

[Marc Knaup]

Hey guys,

I'm looking at Swift 3.0's goal to improve generics.

Is there any info yet if and how we will be able to refer to instances of
protocols that have associated types?
What is the difficulty in supporting this?

Simple examples:
var list = [Hashable]()
var hashable: Hashable = 2

Right now all we get is

> protocol 'Hashable' can only be used as a generic constraint because it
> has Self or associated type requirements


Thanks,
  Marc
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