some tests failed:
failure: http://buildbot.rust-lang.org/builders/auto-win-32-nopt-t/builds/2610
exception: http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/2960
exception: http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/2954
exception: http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/2955
exception: http://buildbot.rust-lang.org/builders/auto-linux-32-opt/builds/2946
exception: http://buildbot.rust-lang.org/builders/auto-linux-32-nopt-t/builds/2945
exception: http://buildbot.rust-lang.org/builders/auto-linux-64-opt/builds/2948
exception: http://buildbot.rust-lang.org/builders/auto-linux-64-nopt-t/builds/2941
exception: http://buildbot.rust-lang.org/builders/auto-linux-64-x-android-t/builds/2938
exception: http://buildbot.rust-lang.org/builders/auto-win-32-opt/builds/2613
exception: http://buildbot.rust-lang.org/builders/auto-win-64-opt/builds/1449
exception: http://buildbot.rust-lang.org/builders/auto-win-64-nopt-t/builds/1440