using System;

public class Program

{

    public static void Main()

    {

        (string a, string b) = F();

​

        (string a, string b) ab = F();

        Console.WriteLine($"a: {a} b: {b} ab: {ab}");

​

        var c = new C();

        (string d, string e) = c;

​

        (string a, string b) f = c;

        Console.WriteLine($"d: {d} e: {e} f: {f}");

​

        //  Covariance

        (object c, object d) g = F();

        //  Implicit conversion

        (double x, double y) t = G();

    }

    public static (string a, string b) F() 

        => ("A", "B");

​

    public static (int x, int y) G() 

        => (0, 1);

}

​

​

public class C

{

    public String A = "A";

    public String B = "B";

    public void Deconstruct(out String a, out String b)

    {

        a = A;

        b = B;

    }

}

​

​