This test is failed with -We.
$ ./python -We -m test -v test_warnings
...
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ERROR: test_module_globals (test.test_warnings.CFilterTests)
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Traceback (most recent call last):
File "/home/serhiy/py/cpython/Lib/test/test_warnings/__init__.py", line 226, in test_module_globals
module_globals=None)
UserWarning: msg
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ERROR: test_module_globals (test.test_warnings.PyFilterTests)
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Traceback (most recent call last):
File "/home/serhiy/py/cpython/Lib/test/test_warnings/__init__.py", line 226, in test_module_globals
module_globals=None)
File "/home/serhiy/py/cpython/Lib/warnings.py", line 375, in warn_explicit
raise message
UserWarning: msg
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