all tests pass:
success: http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/2954
success: http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/2948
success: http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/2949
success: http://buildbot.rust-lang.org/builders/auto-linux-32-opt/builds/2940
success: http://buildbot.rust-lang.org/builders/auto-linux-32-nopt-t/builds/2939
success: http://buildbot.rust-lang.org/builders/auto-linux-64-opt/builds/2942
success: http://buildbot.rust-lang.org/builders/auto-linux-64-nopt-t/builds/2935
success: http://buildbot.rust-lang.org/builders/auto-linux-64-x-android-t/builds/2932
success: http://buildbot.rust-lang.org/builders/auto-win-32-opt/builds/2607
success: http://buildbot.rust-lang.org/builders/auto-win-32-nopt-t/builds/2604
success: http://buildbot.rust-lang.org/builders/auto-win-64-opt/builds/1443
success: http://buildbot.rust-lang.org/builders/auto-win-64-nopt-t/builds/1434