code: def test_superfluous_returns(self):
      def f():
          retval = 1
          return retval
          retval = 2  # pylint:disable=unreachable
          return retval
  
      self.assertTransformedEquivalent(f)
  
imports: from nvidia.dali._autograph.converters import functions
  from nvidia.dali._autograph.converters import return_statements
  from nvidia.dali._autograph.core import converter_testing
label_desc: Use image node_id 3 for calling the SingleReturnTest obj's underlying member method code with example usage: obj.test_superfluous_returns() and returns: retval, retval