match self {
&Command(ref data) => write!(formatter, "Command {{ {} }}", data_to_str(data)),
&Answer(ref data) => write!(formatter, "Answer {{ {} }}", data_to_str(data)),
match self {
&Command(ref data) => write!(formatter, "Command {{ {} }}", data_to_str(data)),
&Answer(ref data) => write!(formatter, "Answer {{ {} }}", data_to_str(data)),