all tests pass:
success: http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/2956
success: http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/2950
success: http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/2951
success: http://buildbot.rust-lang.org/builders/auto-linux-32-opt/builds/2942
success: http://buildbot.rust-lang.org/builders/auto-linux-32-nopt-t/builds/2941
success: http://buildbot.rust-lang.org/builders/auto-linux-64-opt/builds/2944
success: http://buildbot.rust-lang.org/builders/auto-linux-64-nopt-t/builds/2937
success: http://buildbot.rust-lang.org/builders/auto-linux-64-x-android-t/builds/2934
success: http://buildbot.rust-lang.org/builders/auto-win-32-opt/builds/2609
success: http://buildbot.rust-lang.org/builders/auto-win-32-nopt-t/builds/2606
success: http://buildbot.rust-lang.org/builders/auto-win-64-opt/builds/1445
success: http://buildbot.rust-lang.org/builders/auto-win-64-nopt-t/builds/1436