File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1130, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 691, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 713, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 3787, in run
    result = tests.selftest(**selftest_kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3639, in selftest
    result_decorators=result_decorators,
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3178, in run_suite
    result = runner.run(suite)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 791, in run
    test.run(result)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3292, in run
    return super(CountingDecorator, self).run(result)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3281, in run
    test.run(result)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/TestUtil.py", line 89, in run
    tests.pop().run(result)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 491, in run
    return self.__RunTest(self, self.exception_handlers).run(result)
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 74, in run
    return self._run_one(actual_result)
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 88, in _run_one
    return self._run_prepared_result(ExtendedToOriginalDecorator(result))
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 110, in _run_prepared_result
    result.stopTest(self.case)
  File "/usr/lib/python2.7/dist-packages/testtools/testresult/real.py", line 555, in stopTest
    return self.decorated.stopTest(test)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 388, in stopTest
    type_equality_funcs.clear()
AttributeError: '_TypeEqualityDict' object has no attribute 'clear'