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)