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.

#define C(x) //**/* x */**//
C(3)
C(abc /* def */ ghi)

#define D(x) ///**/**/**///**/* x */**///**/**/**///
D(3)
D(abc /* def */ ghi)