dnl @ ../doc/m4.texi:3707: 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.
include(`curry.m4')include(`stack.m4')
dnl @result{}
define(`rename', `copy($@)undefine(`$1')')dnl
define(`copy', `ifdef(`$2', `errprint(`$2 already defined
')m4exit(`1')',
   `stack_foreach(`$1', `curry(`pushdef', `$2')')')')dnl
pushdef(`a', `1')pushdef(`a', defn(`divnum'))pushdef(`a', `2')
dnl @result{}
copy(`a', `b')
dnl @result{}
rename(`b', `c')
dnl @result{}
a b c
dnl @result{}2 b 2
popdef(`a', `c')c a
dnl @result{} 0
popdef(`a', `c')a c
dnl @result{}1 1