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-rw-r--r--Lib/unittest/test/test_program.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/unittest/test/test_program.py b/Lib/unittest/test/test_program.py
index a50a245..d5d0f5a 100644
--- a/Lib/unittest/test/test_program.py
+++ b/Lib/unittest/test/test_program.py
@@ -189,7 +189,7 @@ class TestCommandLineArgs(unittest.TestCase):
class FakeTP(unittest.TestProgram):
def parseArgs(self, *args, **kw): pass
def runTests(self, *args, **kw): pass
- warnoptions = sys.warnoptions
+ warnoptions = sys.warnoptions[:]
try:
sys.warnoptions[:] = []
# no warn options, no arg -> default