anchor.diff:  let _ = DateTime.Now
   """
       |> forLine 5
  +    |> andEntity "System.DateTime"
       |> ns "TopLevel"
       |> position """
   module TopLevel
  
positive.code:     let _ = DateTime.Now
  """
      |> forLine 7
      |> ns "TopLevel.Nested"
      |> position """
  module TopLevel
  
negative.code:     let _ = DateTime.Now
  """
      |> forLine 4
      |> andEntity "System.DateTime"
      |> ns "TopLevel.Nested"
      |> position """
  module TopLevel
  