private OperatorSymbol binaryAccessOperator(int acode) {
        for (Scope.Entry e = syms.predefClass.members().elems;
             e != null;
             e = e.sibling) {
            if (e.sym instanceof OperatorSymbol) {
                OperatorSymbol op = (OperatorSymbol)e.sym;
                if (accessCode(op.opcode) == acode) return op;
            }
        }
        return null;
    }