rust-lang/rust — pull request #18506 by nikomatsakis (2014-11-01 11:00:54+00:00)
Title: Support Sized bounds for associated types

This also refactors associated types in various ways, most notably by moving the associated types defined in a trait into their own param space which replaces the associated-types hashmap (which is just removed). We should probably move the synthetic type parameters into yet another namespace, but that can wait.

Fixes #17921