dnl @ ../doc/m4.texinfo:2337: 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.
dnl(`args are ignored, but side effects occur',
define(`foo', `like this')) while this text is ignored: undefine(`foo')
dnl @error{}m4:stdin:2: Warning: excess arguments to builtin `dnl' ignored
See how `foo' was defined, foo?
dnl @result{}See how foo was defined, like this?