code: def test_iterator_two_vars_loop(self):
      self.assertFunctionMatchesEager(iterator_two_vars_loop, self.ds)
  
imports: import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 7 for calling the ReferenceTest obj's underlying member method code with example usage: obj.test_iterator_two_vars_loop() without return types