anchor.diff:        3 ]
   """
     => [ 2, 5, 4, 9
  -       3, 6, 4, 7 ]
  +       3, 5, 4, 8 ]
   
   [<Test>]
   let ``object expressions``() =
  
positive.code:         ()    // 7
      ()        // 8
  """
      => [ 2, 3, 8, 6
           3, 11, 4, 10
           5, 4, 8, 6
           6, 11, 7, 10 ]
  
  [<Test>]
  let ``try - finally``() =
  
negative.code:         ()          // 10
  """
      => [ 2, 15, 10, 10
           6,  4, 10, 10
           6, 19, 10, 10 
           9,  8, 10, 10 ]
           
  [<Test>]
  let ``computation expressions``() =
  