anchor.diff:                  | Unique_Arg _ -> "a unique argument."
                   | Rest_Arg _ -> "an argument that consumes all remaining command line tokens."
                   | Data _ -> "pass raw data in base64 format."
  +                | Dir _ -> "Project directory to place the config & database in."
                   | Log_Level _ -> "set the log level."
                   | Detach _ -> "detach daemon from console."
                   | Assignment _ -> "assign with colon operation."
  
positive.code:         let result = parser.Parse(clp, ignoreMissing = true)
          test <@ result.GetResult <@ Env @> = ("foo", "bar") @>
  
  
      [<Fact>]
      let ``Ignore Unrecognized parameters`` () =
  
negative.code:         | [<CustomAppSettings "Foo">] CustomAppConfig of string * int
          | [<ColonAssignment>] Assignment of string
          | [<EqualsAssignment>] Env of key:string * value:string
          | [<EqualsAssignment>] Dir of path:string
          | [<First>] First_Parameter of string
          | [<Last>] Last_Parameter of string
          | Optional of int option
  