Add append() and split_off() to DList as per coll. reform.#20406
Merged
bors merged 1 commit intorust-lang:masterfrom Jan 11, 2015 
Merged
Add append() and split_off() to DList as per coll. reform.#20406bors merged 1 commit intorust-lang:masterfrom 
bors merged 1 commit intorust-lang:masterfrom