dnl @ ../doc/m4.texinfo:2520: 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.
`dangling quote
dnl @error{}m4:stdin:1: ERROR: end of file in string