raft/rawnode.go
func (rn *RawNode) WithProgress(visitor func(id uint64, typ ProgressType, pr Progress)) {
	for id, pr := range rn.raft.prs {
		pr := *pr
		pr.ins = nil
		visitor(id, ProgressTypePeer, pr)
	}
	for id, pr := range rn.raft.learnerPrs {
		pr := *pr
		pr.ins = nil
		visitor(id, ProgressTypeLearner, pr)
	}
}
func (rn *RawNode) WithProgress(visitor func(id uint64, typ ProgressType, pr Progress)) {
	for id, pr := range rn.raft.prs {
		pr := *pr
		pr.ins = nil
		visitor(id, ProgressTypePeer, pr)
	}
	for id, pr := range rn.raft.learnerPrs {
		pr := *pr
		pr.ins = nil
		visitor(id, ProgressTypeLearner, pr)
	}
}
// WithProgress is a helper to introspect the Progress for this node and its
// peers.