Optimize slice.{r}position result bounds check#45501

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arthurprs wants to merge 2 commits intorust-lang:masterfrom

arthurprs:iter-position-bounds-check

Commits on Oct 29, 2017

Hint slice.{r}position is within slice bounds
arthurprs
committed

Commits on Oct 30, 2017

run more tests in travis
arthurprs
committed