It looks like etags puts a comma on the end of the lisp name of an
emacs DEFUN.  Eg. the foo.c below which is a copy of car-safe from
src/data.c,

	etags foo.c

creates a TAGS file with (expanding ^? and ^A for the sake of mail),

	foo.c,44
	DEFUN ("car-safe", Fcar_safe,^?car-safe,^A1,0

and indeed in emacs

	M-x visit-tags-table Ret
	M-. Tab

offers a sole completion

	car-safe,

where I didn't expect to see a "," on the end.  Seems harmless most of
the time because you can type car-safe and M-. will jump to a partial
match, but it's not intended is it?

It looks like whatever char is after Fcar_safe is included in the tag,
you can insert a space there in the source and it goes through.