[swift-evolution] struct subtyping

[Andrew Bennett]

+1 this would be great, particularly if:
 * subtypes can be extended
 * subtypes can be generic partial specialisations (
https://github.com/apple/swift-evolution/blob/master/proposals/0048-generic-typealias.md
)

On Thursday, 24 March 2016, Andrey Tarantsov via swift-evolution <
swift-evolution at swift.org
<javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');>> wrote:

> +1, would love this.
>
> A.
>
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