anchor.diff:      property CurrentToken: TMARSToken read GetCurrentToken;
       property CurrentRequest: TWebRequest read GetCurrentRequest;
       property CurrentResponse: TWebResponse read GetCurrentResponse;
  +    class property Instance: TMARSEngine read GetInstance;
  +    class destructor ClassDestructor;
     end;
   
   implementation
  
positive.code:   Result := FURL;
  end;
  
  end.
  
negative.code:   const ASubscriber: IMARSHandleRequestEventListener);
  begin
    FSubscribers.Add(ASubscriber);
  end;
  
  class destructor TMARSEngine.ClassDestructor;
  begin
    if Assigned(_Instance) then
      FreeAndNil(_Instance);
  end;
  
  constructor TMARSEngine.Create;
  