bors e1a575cb07 Auto merge of #33289 - birkenfeld:chain-find, r=bluss
Implement find() on Chain iterators

This results in a roughly 2x speedup compared to the default impl
"inherited" from Iterator.

Benchmark: https://gist.github.com/birkenfeld/aa9b92cb7d55666dd4821207527eaf5b
2016-05-02 04:46:58 -07:00
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