public Builder mergeFrom(JOutPiqi.userid_list other) {
        if (other == JOutPiqi.userid_list.getDefaultInstance()) return this;
        if (!other.elem_.isEmpty()) {
          if (elem_.isEmpty()) {
            elem_ = other.elem_;
            bitField0_ = (bitField0_ & ~0x00000001);
          } else {
            ensureElemIsMutable();
            elem_.addAll(other.elem_);
          }
          onChanged();
        }
        this.mergeUnknownFields(other.getUnknownFields());
        return this;
      }