I once had a very wise boss who lamented the lack of a universal "do_what_I_mean" macro. He soon recognized the shortcoming of such a thing and proposed a "do_what_is_appropriate" macro. If such a macro (or function) exists in this newly discovered code, it is either "buggy" or under utilized. We could use that copy to correct itself. Should we trust it to do that? We could use the corrected version to update all the source code. (Better keep a backup. I suspect we would not be happy with the result.)