using System;

​

X x0 = new X();

X x1 = new X(4);

​

struct Val

{

   public int Valeur { get; }

   public Val(int val)

   {

      Console.WriteLine($"Val({val})");

      Valeur = val; 

   }

}

class X

{

   static Val F() => new Val(3);

   public Val Valeur { get; } = F();

   public X(int valeur)

   {

      Valeur = new Val(valeur);

   }

   public X()

   {

   }

}

​