public Builder setExtensionRange(
          int index, com.google.protobuf.DescriptorProtos.DescriptorProto.ExtensionRange value) {
        if (extensionRangeBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          ensureExtensionRangeIsMutable();
          extensionRange_.set(index, value);
          onChanged();
        } else {
          extensionRangeBuilder_.setMessage(index, value);
        }
        return this;
      }