Is there any way that I can generalise the type definitions here? Ideally, I'd like to be able to change the type of 'testInput' and have test correctly infer the type at compile time.

public static void Run()
{
    var testInput = 3;
    var test = ((Func<int, int>) Identity).Compose<int,int,int>(n => n)(testInput);
    Console.WriteLine(test);
}

public static Func<T, V> Compose<T, U, V>(this Func<U, V> f, Func<T, U> g)
{
    return x => f(g(x));
}

public static T Identity<T> (this T value)
{
    return value;
}