all tests pass:
success: http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/2962
success: http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/2956
success: http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/2957
success: http://buildbot.rust-lang.org/builders/auto-linux-32-opt/builds/2948
success: http://buildbot.rust-lang.org/builders/auto-linux-32-nopt-t/builds/2947
success: http://buildbot.rust-lang.org/builders/auto-linux-64-opt/builds/2950
success: http://buildbot.rust-lang.org/builders/auto-linux-64-nopt-t/builds/2943
success: http://buildbot.rust-lang.org/builders/auto-linux-64-x-android-t/builds/2940
success: http://buildbot.rust-lang.org/builders/auto-win-32-opt/builds/2615
success: http://buildbot.rust-lang.org/builders/auto-win-32-nopt-t/builds/2612
success: http://buildbot.rust-lang.org/builders/auto-win-64-opt/builds/1451
success: http://buildbot.rust-lang.org/builders/auto-win-64-nopt-t/builds/1442