code: def test_while_defines_var_illegal_cases(self, x):
      self.skipTest("TODO(mdanatg): check")
      x = tf.constant(x)
      with self.assertRaisesRegex(ValueError, '"y" must be defined'):
          tf.function(while_defines_var)(x)
  
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 11 for calling the LoopScopingTest obj's underlying member method code with example usage: obj.test_while_defines_var_illegal_cases(x) without return types