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 a() x
+
−a()
+
−a ()
+
−#define b(p) p
+
−x/**/b(1)/**/x
+
−x/**/b (1)/**/x
+
−x/**/b()/**/x
+
−#define c(p,q) p/**/q
+
−x/**/c(1,2)/**/x
+
−x/**/c(1)/**/x
+
−x/**/c()/**/x