code: def get_param_type(self, index):
          
  
          assert index in (0, 1)
  
          type_info = self.type.get_param_type(index)
          type_cls = get_return_class(type_info)
          instance = type_cls(None, type_info, [], self.backend)
          instance.setup()
          return instance
docs: Returns a ReturnValue instance for param type 'index