code: def testGetItem(self):
      def func(n):
          if n == 0:
              return tf_stack.extract_stack()  # COMMENT
          else:
              return func(n - 1)
  
      trace = func(5)
      self.assertIn("func", repr(trace[-1]))
  
      with self.assertRaises(IndexError):
          _ = trace[-len(trace) - 1]
  
      with self.assertRaises(IndexError):
          _ = trace[len(trace)]
  
file_path: tensorflow-upstream/tensorflow/python/util/tf_stack_test.py
imports: from tensorflow.python.platform import test
  from tensorflow.python.util import tf_stack
label_desc: Use image node_id 5 for calling the TFStackTest obj's underlying member method code with example usage: obj.testGetItem() and returns: tf_stack, func