Add the ability to output line numbers, sort of. It is enabled with the intentionally undocumented -p option (similar to -P but reversed sense) and it might be vaguely useful but only prints the line number when the file changes and may not get the line numbers right.

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

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