code: def test_if_nested_with_modification_of_global_not_executed(self):
      global _test_global
      _test_global = None
      self.assertEqual(
          tf.function(if_nested_with_modification_of_global)(0), 0
      )
      self.assertIsNone(_test_global)
  
imports: import itertools
  from absl.testing import parameterized
  import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 6 for calling the NestedControlFlowTest obj's underlying member method code with example usage: obj.test_if_nested_with_modification_of_global_not_executed() without return types