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In the following program, we call check_free_after_iterating( ) twice, in the second time, we recursively call function test_free_after_iterating(). Python interpreter crashes.
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import unittest
import test.support
class UnicodeTest(unittest.TestCase):
	pass
def test_free_after_iterating():
 ut = UnicodeTest()
 test.support.check_free_after_iterating(ut, iter, str)
 test.support.check_free_after_iterating(str, test_free_after_iterating(), str)
test_free_after_iterating()
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System Info: Ubuntu 16.04
Python Version: Python 3.9.1