def test_arguments(self):
x = ast.arguments()
self.assertEqual(x._fields, ('args', 'vararg', 'kwonlyargs',
'kw_defaults', 'kwarg', 'defaults'))
with self.assertRaises(AttributeError):
x.vararg
x = ast.arguments(*range(1, 7))
self.assertEqual(x.vararg, 2)
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