C# COMPILER, Y U MAKE ME SO MUCH CODE WHEN YOU SHOULD KNOW BETTER?

gistfile1.cs

#if DEBUG
    public static XYZ Normalize(this XYZ c, [CallerMemberName] string caller = "")
#else
    public static XYZ Normalize(this XYZ c)
#endif
    {
#if DEBUG // completely needless
      Debug.Print("normalizing: {0} called from: {1}", c, caller);
#endif 
      return new XYZ
      {
        X = c.X / c.Y,
        Y = 1,
        Z = c.Z / c.Y,
      };
    }