31     pub id: u8,  field
138                             id: extid,  in unmarshal()
162                             id: extid,  in unmarshal()
174                         id: 0,  in unmarshal()
281                         buf.put_u8((extension.id << 4) | (extension.payload.len() as u8 - 1));  in marshal_to()
288                         buf.put_u8(extension.id);  in marshal_to()
339     pub fn set_extension(&mut self, id: u8, payload: Bytes) -> Result<(), Error> {  in set_extension()
343                     if !(1..=14).contains(&id) {  in set_extension()
351                     if id < 1 {  in set_extension()
359                     if id != 0 {  in set_extension()
369                 .find(|extension| extension.id == id)  in set_extension()
373                 self.extensions.push(Extension { id, payload });  in set_extension()
385             self.extensions.push(Extension { id, payload });  in set_extension()
393             self.extensions.iter().map(|e| e.id).collect()  in get_extension_ids()
400     pub fn get_extension(&self, id: u8) -> Option<Bytes> {  in get_extension()
404                 .find(|extension| extension.id == id)  in get_extension()
412     pub fn del_extension(&mut self, id: u8) -> Result<(), Error> {  in del_extension()
417                 .position(|extension| extension.id == id)  in del_extension()