Add std::cell::Ref::map and friends#25747

Merged

bors merged 2 commits intorust-lang:masterfrom

SimonSapin:map_ref

May 29, 2015

Commits on May 28, 2015

Move std::cell::clone_ref to a clone associated function on std::cell::Ref
SimonSapin
committed

Commits on May 29, 2015

Add map and filter_map associated functions to std::cell::Ref and RefMut
SimonSapin
committed