Implement placement-in protocol for `BinaryHeap`#39062

Merged

bors merged 2 commits intorust-lang:masterfrom martinhath:placement-in-binaryheap

Jan 20, 2017

+77-2

Commits on Jan 14, 2017

Add initial impl of placement-in for BinaryHeap
Martin Hafskjold Thoresen
committed

Commits on Jan 17, 2017

Fix BinaryHeap place by only constructing vec::PlaceBack once
Martin Hafskjold Thoresen
committed