anchor.diff:  Check out the [samples](https://github.com/fsprojects/Argu/tree/master/samples) 
   folder for CLI implementations that use Argu.
   
  -*)+*)
  
positive.code:     | Amend
      | [<AltCommandLine("-p")>] Patch
      | [<AltCommandLine("-m")>] Message of msg:string
  with
      interface IArgParserTemplate with
          member this.Usage =
              match this with
  
negative.code:     | Port of tcp_port:int
      | Log_Level of level:int
      | Detach
  
      interface IArgParserTemplate with
          member s.Usage =
              match s with
  