Add ArrayVec and AccumulateVec to reduce heap allocations during interning of slices#37270

Merged

bors merged 3 commits intorust-lang:masterfrom Mark-Simulacrum:smallvec-optimized-arenas

Oct 26, 2016

+361-144

Commits on Oct 26, 2016

Add AccumulateVec, a potentially stack-allocated vector.
Mark-Simulacrum
committed
Utilize AccumulateVec to avoid heap allocations in mk_{substs, type_list, tup} calls.
Mark-Simulacrum
committed
Add size hint to Result's FromIterator implementation.
Mark-Simulacrum
committed