public Builder mergeSpecExecutionStartingRequest(main.Messages.SpecExecutionStartingRequest value) {
        if (specExecutionStartingRequestBuilder_ == null) {
          if (((bitField0_ & 0x00000008) == 0x00000008) &&
              specExecutionStartingRequest_ != main.Messages.SpecExecutionStartingRequest.getDefaultInstance()) {
            specExecutionStartingRequest_ =
              main.Messages.SpecExecutionStartingRequest.newBuilder(specExecutionStartingRequest_).mergeFrom(value).buildPartial();
          } else {
            specExecutionStartingRequest_ = value;
          }
          onChanged();
        } else {
          specExecutionStartingRequestBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000008;
        return this;
      }