using System;

​

public class Program

{

    public abstract record Bar<T> where T : new() {

        public static T DefaultValue { get; } = new T();

    }

    public record Foo : Bar<Foo>

    {

        public int Test = 4;

        public static Foo Default = new Foo {

            Test = 2,

        };

    }

​

    public static void Main()

    {

        Foo r = null;

        Console.WriteLine("Test = {0}", Foo.Default.Test);

    }

}