Allow flag injection to trigger ParseException, if there are flags marked as required and have not been assigned a value. Validator functions are at injection time and user need a way to make flags required, without wiring it into the "main function".
Allow flag injection to trigger ParseException, if there are flags marked as required and have not been assigned a value. Validator functions are at injection time and user need a way to make flags required, without wiring it into the "main function".