public Builder mergeCard(DriverCard value) {
        if (cardBuilder_ == null) {
          if (card_ != null) {
            card_ =
              DriverCard.newBuilder(card_).mergeFrom(value).buildPartial();
          } else {
            card_ = value;
          }
          onChanged();
        } else {
          cardBuilder_.mergeFrom(value);
        }

        return this;
      }
<code>.com.alibaba.fastjson2.dubbo.DriverCard card = 16;</code>
core/src/test/java/com/alibaba/fastjson2/dubbo/GoogleProtobufBasic.java