cannot deduced type for opeartor""

#include <iostream>
#include <string_view>
#include <string>

void test();

int main()
{
    test();
}

void test()
{
    using namespace std::string_view_literals;
    auto str = "hello world for string_view"sv;
    std::cout << str << std::endl;

    using namespace std::string_literals;
    auto str1 = "hello world for string"s;
    std::cout << str1 << std::endl;
  // cannot find user-define operator for str and str1
}

Start by reproducing the provided C++ snippet in the VS Code C/C++ extension and record the diagnostic produced for the string_view and string expressions. Inspect the extension's language-service handling of these expressions; done means the diagnostic is correctly reported for the configured C++ standard.