anchor.diff:      | Error of string
       | Project of string
       | OutputMode of OutputMode
  +    | CompilerLocation
       | Help
       | Quit
   
  
positive.code:     outputmode {json,text}
        - switches the output format. json offers richer data
          for some commands
      "
      
    let outputText = @"
  
negative.code:       return HelpText sym
      }
  
    let compilerlocation = parser {
      let! _ = string "compilerlocation"
      return CompilerLocation
      }
  
    // Parses always and returns default error message
    let error = parser { return Error("Unknown command or wrong arguments") }
  
  