Fix slice binary search signature mismatch#41590

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circuitfox wants to merge 4 commits intorust-lang:masterfrom

circuitfox:slice-binary-search-sig

Commits on Apr 27, 2017

Fix slice binary search signature mismatch
circuitfox
committed

Commits on May 2, 2017

binary_search_by_key comparator returns reference
circuitfox
committed

Commits on May 4, 2017