dnl @ ../doc/m4.texinfo:3340: 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.
index(`abc')
dnl @error{}m4:stdin:1: Warning: too few arguments to builtin `index'
dnl @result{}0