mozilla/rust — pull request #13783 by wackywendell (2014-04-26 17:59:44+00:00)
Title: Fixing permutation of small lists, such that [], [x] -> [[]], [[x]]

I filed bugs #13734 and #13759 recently, and then realized I could probably fix them myself. This does exactly that, with a couple additional modifications and additions to the test-suite to pick up on that.

I've never done this before, so please feel free to tell me all the things I'm doing wrong or could be doing better.