517     pub class: MessageClass, // e.g. request  field
524     class: CLASS_REQUEST,
529     class: CLASS_SUCCESS_RESPONSE,
534     class: CLASS_ERROR_RESPONSE,
539         write!(f, "{} {}", self.method, self.class)  in fmt()
569     pub fn new(method: Method, class: MessageClass) -> Self {  in new()
570         MessageType { method, class }  in new()
599         let c = self.class.0 as u16;  in value()
602         let class = c0 + c1;  in value()  localVariable
604         method + class  in value()
613         let class = c0 + c1;  in read_value()  localVariable
614         self.class = MessageClass(class as u8);  in read_value()