public Builder mergeStepValidateResponse(main.Messages.StepValidateResponse value) {
        if (stepValidateResponseBuilder_ == null) {
          if (((bitField0_ & 0x00000800) == 0x00000800) &&
              stepValidateResponse_ != main.Messages.StepValidateResponse.getDefaultInstance()) {
            stepValidateResponse_ =
              main.Messages.StepValidateResponse.newBuilder(stepValidateResponse_).mergeFrom(value).buildPartial();
          } else {
            stepValidateResponse_ = value;
          }
          onChanged();
        } else {
          stepValidateResponseBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000800;
        return this;
      }