[swift-evolution] Enhanced existential types proposal discussion

[Matthew Johnson]

> On May 26, 2016, at 9:54 AM, Jan E. Schotsman via swift-evolution <swift-evolution at swift.org> wrote:
> 
> In the "where clause" section, shouldn't this be allowed:
> 
> let a : Any<Collection, SetAlgebraType where Collection.Element == SetAlgebraType.Element>
> 
> I am asking because the acceptable type equality constraint is stated as:
> 
> Type equality constraint: X == ConcreteType

Yes, you should definitely be able to equate two associate types!  If the proposal isn’t clear about that it is probably just an oversight.  Good catch!

> 
> Jan E.
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