anchor.diff:  """
   
           Fsx fsharpSource
  -        |> withLangVersion46
  +        |> withLangVersion50
           |> withReferences [csharpLib]
           |> compile
           |> shouldFail
  
positive.code:         ()"""
  
          Fsx fsharpSource
          |> withLangVersion46
          |> withReferences [csharpLib]
          |> compile
          |> shouldFail
  
negative.code:         ()
  """
          Fsx fsharpSource
          |> withLangVersion50
          |> withReferences [csharpLib]
          |> compile
          |> shouldFail
  