code: def test_single_for(self, l, type_, target):
      if (type_ is _int_dataset) and (
          target
          in (
              unconditional_return_in_single_for,
              effectively_unconditional_return_in_single_for,
          )
      ):
          # TODO(mdan): Enable in a separate improvement.
          self.skipTest("Creating symbols in dataset loops.")
  
      if (not l) and (
          (
              target
              in (
                  unconditional_return_in_single_for,
                  effectively_unconditional_return_in_single_for,
              )
          )
      ):
          self.skipTest(
              "Undefined symbols require at least one iteration."
          )
  
      l = type_(l)
      self.assertFunctionMatchesEager(target, l)
  
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 1 for calling the LoopControlFlowTest obj's underlying member method code with example usage: obj.test_single_for(l, type_, target) without return types