some tests failed:
failure: http://buildbot.rust-lang.org/builders/auto-win-32-opt/builds/2608
exception: http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/2955
exception: http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/2949
exception: http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/2950
exception: http://buildbot.rust-lang.org/builders/auto-linux-32-opt/builds/2941
exception: http://buildbot.rust-lang.org/builders/auto-linux-32-nopt-t/builds/2940
exception: http://buildbot.rust-lang.org/builders/auto-linux-64-opt/builds/2943
exception: http://buildbot.rust-lang.org/builders/auto-linux-64-nopt-t/builds/2936
exception: http://buildbot.rust-lang.org/builders/auto-linux-64-x-android-t/builds/2933
exception: http://buildbot.rust-lang.org/builders/auto-win-32-nopt-t/builds/2605
exception: http://buildbot.rust-lang.org/builders/auto-win-64-opt/builds/1444
exception: http://buildbot.rust-lang.org/builders/auto-win-64-nopt-t/builds/1435