dnl @ ../doc/m4.texinfo:1477: Origin of test dnl @ Copyright (C) 2006 Free Software Foundation dnl @ This file is free software; the Free Software Foundation dnl @ gives unlimited permission to copy and/or distribute it dnl @ with or without modifications, as long as this notice dnl @ is preserved. define(`zap', defn(`undefine')) dnl @result{} zap(`undefine') dnl @result{} undefine(`zap') dnl @result{}undefine(zap)