anchor.diff:      printfn "allo"
       printfn "allo"
   """
  -    =>  [(2, 0, 4, 18)]
  +    =>  [(2, 3, 4, 18)]
   
   
   [<Test>]   
  
positive.code:         ()       // 8
  """
      => [ 2, 10,  8, 10
           3,  4,  4, 10
           3, 13,  4, 10
           6,  4,  8, 10 ]
  
  [<Test>]
  let ``complex outlining test``() =
  
negative.code: | 0 ->  ()
          ()
  """
      => [ 2, 8, 4, 10
           (3, 2, 4, 10)]
  
  [<Test>]
  