FollowRefReturn.cs

class Program
{
    static void Main()
    {
        var a = 1;
        ref var b = ref Increment(ref a);
        b++;
        var c = Increment(ref b);
        c++;
        System.Console.WriteLine($@"a: {a}
b: {b}
c: {c}");
        ref int Increment(ref int input)
        {
            input++;
            return ref input;
        }
    }
}