Specialize nth_back (MSRV 1.37)
#106
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The commented-out implementations of
nth_backhave had aTODO(MSRV)for a while, since that requires Rust 1.37. The main reason we held back on 1.36 was foritertools, but they've required 1.43 sinceitertools v0.11.0published 6 months ago. I don't see any other functionality in that range that would be useful toeitherthough, so we might as well stick to the minimal bump here.