Don't assert and leak memory if failing during argument collection. Once you have a -D option or a -include foo option, you need to clean up the arrays those are accumulated in if you die before they're collected and handled.

1.
;
2.
(a, );
(, b);
( , );
(a,);
(,b);
(,);
3.
(a, b, );
(a, , c);
(, , c);
(a, , );
(, b, );
(, , c);
(, , )
(a,b,);
(a,,c);
(,,c);
(a,,);
(,b,);
(,,c);
(,,)