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-rw-r--r--Lib/test/test_ast.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 4184bc6..e068b0a 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -163,6 +163,9 @@ class AST_Tests(unittest.TestCase):
self.assertEquals(x.right, 3)
self.assertEquals(x.lineno, 0)
+ # this used to fail because Sub._fields was None
+ x = _ast.Sub()
+
def test_main():
test_support.run_unittest(AST_Tests)