rust-lang/rust — pull request #19720 by csouth3 (2014-12-11 05:17:43+00:00)
Title: Change `VecMap`'s iterators to use wrapper structs instead of typedefs.

As mentioned in #19663, it is more desirable long-term that iterators be implemented as wrapper structs instead of typedefs. This pull request converts `VecMap` to the preferred solution.