0u16.write(&mut res).expect("Writes cannot fail");
}
(chan_update.serialized_length() as u16 + 2).write(&mut res).expect("Writes cannot fail");
0u16.write(&mut res).expect("Writes cannot fail");
}
(chan_update.serialized_length() as u16 + 2).write(&mut res).expect("Writes cannot fail");