namespace spanner = ::google::cloud::spanner;  [](std::string const& project_id, std::string const& instance_id,     std::string const& database_id) {    google::cloud::Options options;    // AddUniverseDomainOption interrogates the UnifiedCredentialsOption, if    // set, in the provided Options for the Universe Domain associated with the    // credentials and adds it to the set of Options.    // If no UnifiedCredentialsOption is set, GoogleDefaultCredentials are used.    auto ud_options =        google::cloud::AddUniverseDomainOption(std::move(options));    if (!ud_options.ok()) throw std::move(ud_options).status();    return spanner::Client(spanner::MakeConnection(        spanner::Database(project_id, instance_id, database_id), *ud_options));  }