code: def append_trust_op(self, destination, code, limit=None, source=None):  # pragma: no cover
          
          warnings.warn(
              "append_trust_op will be deprecated in the future, use append_change_trust_op instead.",
              PendingDeprecationWarning
          )  # pragma: no cover
  
          return self.append_change_trust_op(asset_code=code, asset_issuer=destination, limit=limit,
                                             source=source)
docs: append_trust_op will be deprecated in the future, use append_change_trust_op instead.
          Append a :class:`ChangeTrust <stellar_base.operation.ChangeTrust>`
          operation to the list of operations.
  
          :param str destination: The issuer address for the asset.
          :param str code: The asset code for the asset.
          :param str limit: The limit of the new trustline.
          :param str source: The source address to add the trustline to.
          :return: This builder instance.