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Seen on a buildbot:
test test_multiprocessing crashed -- Traceback (most recent call last):
 File "/export/home/buildbot/32bits/3.x.cea-indiana-x86/build/Lib/test/regrtest.py", line 1229, in runtest_inner
 the_package = __import__(abstest, globals(), locals(), [])
 File "<frozen importlib._bootstrap>", line 1030, in _find_and_load
 File "<frozen importlib._bootstrap>", line 611, in load_module
 File "<frozen importlib._bootstrap>", line 271, in module_for_loader_wrapper
 File "<frozen importlib._bootstrap>", line 499, in _load_module
 File "/export/home/buildbot/32bits/3.x.cea-indiana-x86/build/Lib/test/test_multiprocessing.py", line 2430, in <module>
 testcases_processes = create_test_cases(ProcessesMixin, type='processes')
 File "/export/home/buildbot/32bits/3.x.cea-indiana-x86/build/Lib/test/test_multiprocessing.py", line 2409, in create_test_cases
 class Temp(base, unittest.TestCase, Mixin):
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
Here is a patch.

Patch looks good - thanks.

New changeset ab3df6979bd0 by Antoine Pitrou in branch '3.2':
Issue #14664: It is now possible to use @unittest.skip{If,Unless} on a test class that doesn't inherit from TestCase (i.e. a mixin).
http://hg.python.org/cpython/rev/ab3df6979bd0
New changeset 188b96e0ea89 by Antoine Pitrou in branch 'default':
Issue #14664: It is now possible to use @unittest.skip{If,Unless} on a test class that doesn't inherit from TestCase (i.e. a mixin).
http://hg.python.org/cpython/rev/188b96e0ea89 

Fixed, thanks.

This could go into 2.7 too.

New changeset 8a8d2f05068a by Antoine Pitrou in branch '2.7':
Issue #14664: It is now possible to use @unittest.skip{If,Unless} on a test class that doesn't inherit from TestCase (i.e. a mixin).
http://hg.python.org/cpython/rev/8a8d2f05068a 

> This could go into 2.7 too.
Done!

Thanks Antoine - much appreciated.