[swift-evolution] Allow a typealias to be named after the corresponding type

[Brent Royal-Gordon]

> public struct BinarySearchTree<Key: Comparable, Value> {
>     typealias Node = Node<Key, Value>
>     var root: Node?
> }
> 
> private class Node<Key: Comparable, Value> { }
> 
> This code currently doesn’t compile because the Node typealias circularly references itself. I’d like this syntax to just work, because this are the alternatives:
> - rename the typealias to something like `TheNode`
> - rename the Node class
> - don’t use a typealias at all

- fully qualify the class name with the name of the module:

	typealias Node = DataStructureKit.Node<Key, Value>

-- 
Brent Royal-Gordon
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