code: def test_comprehension_leaking(self):
      def test_fn(a):
          _ = [x for x in a]
          return x  # pylint:disable=undefined-loop-variable
  
      node = self._parse_and_analyze(test_fn)
      fn_body = node.body
  
      listcomp_target = fn_body[0].value.generators[0].target
      retval = fn_body[1].value
  
      # Python2 leaks list comprehension symbols. Python3 doesn't.
      # For details, see:
      # https://stackoverflow.com/questions/4198906/list-comprehension-rebinds-names-even-after-scope-of-comprehension-is-this-righ
      self.assertHasDefs(retval, 0)
  
imports: from tensorflow.python.autograph.pyct import anno
  from tensorflow.python.autograph.pyct import cfg
  from tensorflow.python.autograph.pyct import naming
  from tensorflow.python.autograph.pyct import parser
  from tensorflow.python.autograph.pyct import qual_names
  from tensorflow.python.autograph.pyct import transformer
  from tensorflow.python.autograph.pyct.static_analysis import activity
  from tensorflow.python.autograph.pyct.static_analysis import reaching_definitions
  from tensorflow.python.platform import test
label_desc: Use image node_id 15 for calling the ReachingDefinitionsAnalyzerTest obj's underlying member method code with example usage: obj.test_comprehension_leaking() and returns: x