[swift-evolution] struct subtyping

[James Campbell]

Would love a way of extending an existing struct as a new type but it not
being related to the struct it extends.

Sort of like a mixin but for structs, so I could have:

struct Object {
let identifier: String
}

struct User: Object {

}

struct Tree: Object {
}

The last two structs get the identifier property "mixed" in but are unique
types :)

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On Thu, Mar 24, 2016 at 2:16 PM, Tino Heth via swift-evolution <
swift-evolution at swift.org> wrote:

>
> > Could we accomplish something similar to `newtype` by making the
> `typealias` declaration more powerful?
> It's the first thing I tried, but afair someone from the Core Team opposed
> extending typealias - and I had to agree that an "alias" should be just a
> synonym.
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