all tests pass:
success: http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/2957
success: http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/2951
success: http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/2952
success: http://buildbot.rust-lang.org/builders/auto-linux-32-opt/builds/2943
success: http://buildbot.rust-lang.org/builders/auto-linux-32-nopt-t/builds/2942
success: http://buildbot.rust-lang.org/builders/auto-linux-64-opt/builds/2945
success: http://buildbot.rust-lang.org/builders/auto-linux-64-nopt-t/builds/2938
success: http://buildbot.rust-lang.org/builders/auto-linux-64-x-android-t/builds/2935
success: http://buildbot.rust-lang.org/builders/auto-win-32-opt/builds/2610
success: http://buildbot.rust-lang.org/builders/auto-win-32-nopt-t/builds/2607
success: http://buildbot.rust-lang.org/builders/auto-win-64-opt/builds/1446
success: http://buildbot.rust-lang.org/builders/auto-win-64-nopt-t/builds/1437