code: def test_nested_functions_isolation(self):
      def test_fn(a):
          a = 0
  
          def child():
              a = 1
              return a
  
          child()
          return a
  
      node = self._parse_and_analyze(test_fn)
      fn_body = node.body
  
      parent_return = fn_body[3]
      child_return = fn_body[1].body[1]
      # The assignment `a = 1` makes `a` local to `child`.
      self.assertNotSameDef(parent_return.value, child_return.value)
  
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 9 for calling the ReachingDefinitionsAnalyzerTest obj's underlying member method code with example usage: obj.test_nested_functions_isolation() and returns: a, a