rust-lang/rust — pull request #14968 by mneumann (2014-06-17 12:32:18+00:00)
Title: Add the find_mut_equiv method to hashmap::HashMap

This is a rebase of #11074.

Based on this commit:
https://github.com/rcatolino/rust/commit/12d9fd6b0100a2141627e0b21a67ed9976a09c40