using System;

​

public static class Program

{

    // Function f takes an A and returns a B

    public static Func<A, B> f = (A a) => new B(); // Define how to transform A to B

    // Function g takes a B and returns a C

    public static Func<B, C> g = (B b) => new C(); // Define how to transform B to C

    // Function h composes f and g, taking an A and returning a C

    public static Func<A, C> h = (A a) => g(f(a));

​

    public static void Main()

    {

        // Example usage

        A a = new A();

        C c = h(a);

        Console.WriteLine(c.ToString()); // Assuming C has a meaningful ToString override

    }

}

​

public readonly record struct A { }

public readonly record struct B { }

public readonly record struct C { }

​