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.

this line 'has /* no' comment */ in it

#define BELCH(x) 'x'
"BELCH(123)": BELCH(123)
'BELCH(123)': BELCH(123)