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auto merge of #18056 : TeXitoi/rust/shootout-reverse-complement-improvement, r=alexcrichton
This is some improvement as asked and discused here: http://www.reddit.com/r/rust/comments/2j2ij3/benchmark_improvement_reverse_compliment/
Before:
```
real 0m0.396s
user 0m0.280s
sys 0m0.112s
```
after:
```
real 0m0.293s
user 0m0.216s
sys 0m0.076s
```
best C version:
```
real 0m0.135s
user 0m0.132s
sys 0m0.060s
```
Another possibility will be to add a `DoubleEndedIterator::next_two_side()` with a deffault implementation, and specialising it for slices, and use it here (`MutableSlice::reverse()` can then become safe). This benchmark will then be safe.
What do you think?
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