code: private OperatorSymbol makeOperator(Name name, List<OperatorType> formals, OperatorType res, int... opcodes) {
          MethodType opType = new MethodType(
                  formals.stream()
                          .map(o -> o.asType(syms))
                          .collect(List.collector()),
                  res.asType(syms), List.nil(), syms.methodClass);
          return new OperatorSymbol(name, opType, mergeOpcodes(opcodes), syms.noSymbol);
      }
docs: Creates an operator symbol.