m.Size isnt used

client.go

@@ -101,7 +101,6 @@ func (w *reply) receive() (*Msg, error) {
 		return nil, err
 	}
 	w.rtt = time.Since(w.t)
-	m.Size = n
 	if t := m.IsTsig(); t != nil {
 		secret := t.Hdr.Name
 		if _, ok := w.client.TsigSecret[secret]; !ok {

msg.go

@@ -70,7 +70,6 @@ type MsgHdr struct {
 type Msg struct {
 	MsgHdr
 	Compress bool       // If true, the message will be compressed when converted to wire format.
-	Size     int        // Number of octects in the message received from the wire.
 	Question []Question // Holds the RR(s) of the question section.
 	Answer   []RR       // Holds the RR(s) of the answer section.
 	Ns       []RR       // Holds the RR(s) of the authority section.