def _handle_fail(self, message, event):
        retry = 1 - event.headers.get(RETRY_HEADER, self.handler.retry)
        if retry >= 0:
            self._requeue(event, retry)
        message.reject()
        logger.exception('failed to handle event from queue %r (tries_left=%s)', self.handler.queue_name, retry)
        self.event_system.container.error_hook(sys.exc_info())
dataset/ETHPy150Open deliveryhero/lymph/lymph/events/kombu.py/EventConsumer._handle_fail/swapped operands of `-`