How to null check c# 7 tuple in LINQ query?

Given:

class Program
{
    private static readonly List<(int a, int b, int c)> Map = new List<(int a, int b, int c)>()
    {
        (1, 1, 2),
        (1, 2, 3),
        (2, 2, 4)
    };

    static void Main(string[] args)
    {
        var result = Map.FirstOrDefault(w => w.a == 4 && w.b == 4);

        if (result == null)
            Console.WriteLine("Not found");
        else
            Console.WriteLine("Found");
    }
}

In the above example, a compiler error is encountered at line if (result == null).

CS0019 Operator '==' cannot be applied to operands of type '(int a, int b, int c)' and '' How would I go about checking that the tuple is found prior to proceeding in my "found" logic? Prior to using the new c# 7 tuples, I would have this:

class Program
{
    private static readonly List<Tuple<int, int, int>> Map = new List<Tuple<int, int, int>>()
    {
        new Tuple<int, int, int> (1, 1, 2),
        new Tuple<int, int, int> (1, 2, 3),
        new Tuple<int, int, int> (2, 2, 4)
    };

    static void Main(string[] args)
    {
        var result = Map.FirstOrDefault(w => w.Item1 == 4 && w.Item2 == 4);

        if (result == null)
            Console.WriteLine("Not found");
        else
            Console.WriteLine("Found");
    }
}

Which worked fine. I like the more easily interpreted intention of the new syntax, but am unsure on how to null check it prior to acting on what was found (or not).