[swift-evolution] extending typealiases

[Xiaodi Wu]

Seems totally fair to add if someone wants to devote the time and effort to
implement it, but also easily worked around for the moment and therefore
(IMO) not a pressing issue.


On Sun, Jan 29, 2017 at 3:03 PM, Matt Whiteside via swift-evolution <
swift-evolution at swift.org> wrote:

> In Swift 3.1, I was happy to see that we can now extend types with
> concrete constraints.  I think one other feature which fits nicely with
> this new capability would be extending typealiases, like this:
>
> *typealias Vector = Array<Float>*
>
> *extension Vector {*
> *   ...*
> *}*
>
> Which currently doesn't compile due to:  "Constrained extension must be
> declared on the unspecialized generic type 'Array' with constraints
> specified by a 'where’ clause”
>
> What is other people’s interest level?  How possible would it be to add
> this?
>
> -Matt
>
>
>
>
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