using System;
 
class Ref<A>
{
	private A value;
	public A Value {
		get { return this.value; }
		set { this.value = value; }
	}
	public Ref(A value) { this.value = value; }
}
 
public class Test
{
	private static void print<A, B>(Ref<A> a, Ref<B> b)
	{
		Console.WriteLine("a.Value = {0}, b.Value = {1}", a.Value, b.Value);
	}
 
	public static void Main()
	{
		var a = new Ref<object>(null);
		var b = a;
		print(a, b);
		a.Value = new object();
		print(a, b);
	}
}

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