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Cosa stampa a console il seguente snippet e perché?:

using System;
 
class Foo
{
    public Foo(out Foo foo)
    {
        foo = this;
        throw new Exception();
    }
}
 
class Test
{
    static void Main()
    {
        Foo f = null;
        try { f = new Foo(out f); }
        catch { }
        Console.WriteLine(f == null ? "null" : "not null");
    }
}