code: def test_for_creates_var_illegal(self):
      with self.assertRaisesRegex(
          UnboundLocalError, "used before assignment"
      ):
          tf.function(for_creates_var)([])
      with self.assertRaisesRegex(
          tf.errors.InvalidArgumentError,
          "loop must iterate at least once",
      ):
          tf.function(for_creates_var)(tf.constant([]))
  
imports: import functools
  import itertools
  from absl.testing import parameterized
  import tensorflow
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 15 for calling the ReferenceTest obj's underlying member method code with example usage: obj.test_for_creates_var_illegal() without return types