anchor.diff:                  then
                       try
                           match FrontendsManager.Component feName with
  -                           | Some fron -> fron
  -                           | None -> failwith "Frontend is not found."
  +                        | Some fe -> fe
  +                        | None -> failwith "Frontend is not found."
                       with
                       | _ -> _raise ()
                   else _raise ()
  
positive.code:             // Parse grammar    
              let ilTree =  
                  //try
                      let defStr = 
                          List.fold (fun acc x -> if acc = "" then x else (acc + ";" + x)) "" !userDefs
                      if System.String.IsNullOrEmpty defStr
                      then grammarFilePath
                      else grammarFilePath + "%" + defStr
  
negative.code:                 //| e -> GenError e.Message |> raise
  
  //#if DEBUG               
              printf "%A" result
  //#endif
              ()
          | _, None, _          -> EmptyArg "frontend name (-f)" |> raise
  