class Program
{
    static void F1((string?, string) t1)
    {
        (object?, object?) u1 = t1;
        u1.Item1.ToString(); // warn
        u1.Item2.ToString();
    }

    static void F2((object?, object) t2)
    {
        var u2 = ((string?, string?))t2;
        u2.Item1.ToString(); // warn
        u2.Item2.ToString();
    }
}