public Parser ioSection() {
        if (ioSectionParser == null) {
           FutureParser future = scoped("ioSection");
           ioSectionParser = future;
           future.setParser(
               sequence(
                   token("INPUT-OUTPUT"),
                   token("SECTION"),
                   token("."),
                   optional(
                       ioSectionBody()
                   )
               )
           );
        }

        return ioSectionParser;
    }