how would you write something like

    #include <print>
    #include <map>
    #include <string>

    int main(int argc, char** argv) 
    {
      using namespace std::literals;

      std::string foo = "foo:";
      foo += argv[0];

      std::map<std::string, int> m{
        {foo, 123}
      , {"count: "s + std::to_string(argc), 456}
      };

      std::println("{}", m);
    }