public Parser bitwiseOperand() {
        if (bitwiseOperandParser == null) {
           FutureParser future = scoped("bitwiseOperand");
           bitwiseOperandParser = future;
           future.setParser(
               sequence(
                   summand(),
                   star(
                       sequence(
                           signDef(),
                           summand()
                       )
                   )
               )
           );
        }

        return bitwiseOperandParser;
    }