// .  Some day we may have connections between priority levels, but
// today is not that day.
type QueueSet interface {
	// BeginConfigChange starts the two-step process of updating the
	// configuration.  No change is made until Complete is called.  If
	// `C := X.BeginConstruction(q)` then `C.Complete(d)` returns the

	return noRestraintCompleter{}, nil
}

func (noRestraintCompleter) Complete(dCfg fq.DispatchingConfig) fq.QueueSet {
	return noRestraint{}
}

func (noRestraint) BeginConfigChange(qCfg fq.QueuingConfig) (fq.QueueSetCompleter, error) {
	return noRestraintCompleter{}, nil
}

func (noRestraint) IsIdle() bool {
	return false
}

	return ctlrTestQueueSetCompleter{cts, nil, qc}, nil
}

func (cqs *ctlrTestQueueSet) BeginConfigChange(qc fq.QueuingConfig) (fq.QueueSetCompleter, error) {
	return ctlrTestQueueSetCompleter{cqs.cts, cqs, qc}, nil
}

func (cqs *ctlrTestQueueSet) Dump(bool) debug.QueueSetDump {
	return debug.QueueSetDump{}
}

	for i := 0; i < n; i++ {
		fqqueues[i] = &queue{index: baseIndex + i, requestsWaiting: newRequestFIFO(), requestsExecuting: sets.New[*request]()}
	}
	return fqqueues
}

func (qs *queueSet) BeginConfigChange(qCfg fq.QueuingConfig) (fq.QueueSetCompleter, error) {
	dealer, err := checkConfig(qCfg)
	if err != nil {
		return nil, err
	}
	return &queueSetCompleter{
		theSet: qs,
		qCfg:   qCfg,

			}
		}
	} else {
		qcQS = fq.QueuingConfig{Name: pl.Name, DesiredNumQueues: -1}
	}
	var qsc fq.QueueSetCompleter
	var err error
	if queues != nil {
		qsc, err = queues.BeginConfigChange(qcQS)
	} else {
		qsc, err = qsf.BeginConstruction(qcQS, reqsIntPair, execSeatsObs, seatDemandGauge)
	}
	if err != nil {