dnl @ ../doc/m4.texi:1509: Origin of test
dnl @ expected status: 0
dnl @ extra options: 
dnl @ Copyright (C) 2006, 2007, 2008, 2009 Free Software
dnl @ Foundation, Inc.
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(`cde', `CDE')
dnl @result{}
define(`x', `substr(ab')
dnl @result{}
define(`y', `cde, `1', `3')')
dnl @result{}
x`'y
dnl @result{}bCD