21     pub msg: Option<Vec<u8>>,  field
53             msg: Some(vec![0; HEADER_LEN]),  in new()
151         let msg = self.msg.take();  in add_question()  localVariable
152         if let Some(mut msg) = msg {  in add_question()
153             msg = q.pack(msg, &mut self.compression, self.start)?;  in add_question()
155             self.msg = Some(msg);  in add_question()
181         if let Some(msg) = self.msg.take() {  in add_resource()
182             let (mut msg, len_off) = r.header.pack(msg, &mut self.compression, self.start)?;  in add_resource()
183             let pre_len = msg.len();  in add_resource()
185                 msg = body.pack(msg, &mut self.compression, self.start)?;  in add_resource()
186                 r.header.fix_len(&mut msg, len_off, pre_len)?;  in add_resource()
189             self.msg = Some(msg);  in add_resource()
205         if let Some(mut msg) = self.msg.take() {  in finish()
206             msg[..HEADER_LEN].copy_from_slice(&buf[..HEADER_LEN]);  in finish()
207             Ok(msg)  in finish()