rust-lang/rust — pull request #15220 by vhbit (2014-06-27 18:26:31+00:00)
Title: TreeMap: find_equiv(_mut) for str-like keys

- it allows to lookup using any str-equiv object, making TreeMaps finally usable (for example, it is much easier to work with JSON with lookup values being static keys)
- actually provides pretty flexible solution which could be extended to other equivalent types (although it might be not that performant)