code: def enable(self):
          
          yield from self._check_for_feature()
  
          iq = aioxmpp.IQ(
              type_=aioxmpp.IQType.SET,
              payload=carbons_xso.Enable()
          )
  
          yield from self.client.send(iq)
docs: Enable message carbons.
  
          :raises RuntimeError: if the server does not support message carbons.
          :raises aioxmpp.XMPPError: if the server responded with an error to the
                                     request.
          :raises: as specified in :meth:`aioxmpp.Client.send`