ParserExceptionHandler typedef
        ParserExceptionHandler =
     RouteMatchList Function(BuildContext context, RouteMatchList routeMatchList)
    
    
The function signature of GoRouteInformationParser.onParserException.
The routeMatchList parameter contains the exception explains the issue
occurred.
The returned RouteMatchList is used as parsed result for the GoRouterDelegate.
Implementation
typedef ParserExceptionHandler = RouteMatchList Function(
  BuildContext context,
  RouteMatchList routeMatchList,
);