test_unpack_ex fails on several buildbots:

http://buildbot.python.org/all/builders/x86-64%20Ubuntu%2015.10%20Skylake%20CPU%203.6/builds/120/steps/test/logs/stdio

test test_unpack_ex failed
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File "/home/buildbot/buildarea/3.6.intel-ubuntu-skylake/build/Lib/test/test_unpack_ex.py", line ?, in test.test_unpack_ex.__test__.doctests
Failed example:
    {**1}
Expected:
    Traceback (most recent call last):
    ...
    TypeError: 'int' object is not a mapping
Got:
    Traceback (most recent call last):
      File "/home/buildbot/buildarea/3.6.intel-ubuntu-skylake/build/Lib/doctest.py", line 1330, in __run
        compileflags, 1), test.globs)
      File "<doctest test.test_unpack_ex.__test__.doctests[38]>", line 1, in <module>
        {**1}
    TypeError: 'int' object is not a mapping1
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File "/home/buildbot/buildarea/3.6.intel-ubuntu-skylake/build/Lib/test/test_unpack_ex.py", line ?, in test.test_unpack_ex.__test__.doctests
Failed example:
    {**[]}
Expected:
    Traceback (most recent call last):
    ...
    TypeError: 'list' object is not a mapping
Got:
    Traceback (most recent call last):
      File "/home/buildbot/buildarea/3.6.intel-ubuntu-skylake/build/Lib/doctest.py", line 1330, in __run
        compileflags, 1), test.globs)
      File "<doctest test.test_unpack_ex.__test__.doctests[39]>", line 1, in <module>
        {**[]}
    TypeError: 'list' object is not a mapping1
**********************************************************************
1 items had failures:
   2 of  85 in test.test_unpack_ex.__test__.doctests
***Test Failed*** 2 failures.