object TestWorksheet {

  object A {
    implicit final def AtoB(x: A): B = new B
  }
  class A
  class AA extends A

  class B {
    def fun() = {}
  }
  
  //implicit def AtoB(x: A) = new B
  
  (new A) .fun() // it works with A
  (new AA).fun() // it works with a subclasses from A
  
  // but id doesn't work with an anonymous class extending A
  //(new A{var x = 1}).fun() // does not compile
 
  /*
   * Note that it works, when we use implicit classes
   */
  {
    implicit def C(x: A) = new B
    (new A)  .fun()
    (new A{}).fun()
  }
}