[swift-evolution] [Idea] Typealias for protocols with associated types

[Eugene Gubin]

Currently protocols with associated types could not be used as types. One
could use type-erased wrappers (e.g. AnyGenerator,
AnyRandomAccessCollection etc.) but writing these produce a lot of
boilerplate code. I think it would be convenient to use something like this:

class MyClass {
    typealias IntCollection = CollectionType where
CollectionType.Generator.Element == Int

    var collection: IntCollection
}
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