rust-lang/rust — pull request #17960 by mahkoh (2014-10-11 23:18:43+00:00)
Title: improve clone_from_slice performance

Old vs. New vs. Vec::push_all

```
test slice ... bench: 3091942 ns/iter (+/- 54460)
test slice_new ... bench: 1800065 ns/iter (+/- 69513)
test vec ... bench: 1804805 ns/iter (+/- 75609)
```