[swift-evolution] [Pitch] Add namespacing to associatedTypes

[Brent Royal-Gordon]

> Types associated with a protocol are not namespaced by the protocol, but rather by the protocol's adopters. As such, when two protocols declare a common associatedType, adoption of those protocols introduces undesirable ambiguity.

I don't think there's much of a point solving this just for associated types. The same issue exists for all protocol requirements.

> Given the understandable propensity of developers to arrive at similarly named types (T, for example), it is likely that this problem will reduce the compatibility of packages for reasons that may not be entirely clear to the package consumer.

Then don't do that. Absurdly short associated/generic type names are like absurdly short variable or function names—they're okay in a very small context like a short function or a single loop, but a bad idea in a wider context. That's why the Swift 2 standard library moved away from using short names like `T` in generic types like Array and Optional.

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Brent Royal-Gordon
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