One, an assertion in the random number generator - stack trace: http://pastebin.mozilla.org/1700653

Another, a segmentation fault in rust_env_pairs - stack trace: http://pastebin.mozilla.org/1700654

These are pretty rare - in 100 tries under gdb, the first one happened 3 times, and the second 1 time.

I found these after submitting linked failure in rust (5d6d3d0), but verified they existed before, too (at 424ae44).