Expose TwoWaySearcher's next and next_back functions #11
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Handles #10 as the minimum required to use
TwoWaySearcher
in aSearcher
impl.There is some ability for API misuse here since
new
takes a needle, but doesn't save it meaningnext
andnext_back
need to be given the same needle again to work correctly. It may be worth storing the needle in the searcher, but this would require a lifetime to be added.