impl::NodeMatcherProperties Attr(string name);

std::pair<string, AttrValue> AttrLiteralHelper(
    const std::pair<string, bool>& bool_attr);

std::pair<string, AttrValue> AttrLiteralHelper(
    const std::pair<string, absl::Span<const int>>& int_list_attr);

std::pair<string, AttrValue> AttrLiteralHelper(
    const std::pair<string, absl::Span<const string>>& string_list_attr);
}  // namespace impl

  return props;
}

std::pair<string, AttrValue> impl::AttrLiteralHelper(
    const std::pair<string, bool>& bool_attr) {
  AttrValue attr_value;
  attr_value.set_b(bool_attr.second);
  return {bool_attr.first, attr_value};
}

std::pair<string, AttrValue> impl::AttrLiteralHelper(
    const std::pair<string, absl::Span<const int>>& int_list_attr) {
  AttrValue attr_value;