Description:
------------
I get memory leaks when nesting list() statements to assign array variables to local variables. I get no leaks if list() is not nested.

Reproduce code:
---------------
php -a
Interactive shell

php > list(list($a,$b),$c)=array(array('a','b'),'c');
php > quit



Expected result:
----------------
Nothing.

Actual result:
--------------
[Fri Mar 23 08:28:26 2007]  Script:  '-'
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_vm_execute.h(3533) :  Freeing 0x08923060 (16 bytes), script=-
Last leak repeated 1 time
[Fri Mar 23 08:28:26 2007]  Script:  '-'
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_vm_execute.h(6308) :  Freeing 0x0892323C (16 bytes), script=-
[Fri Mar 23 08:28:26 2007]  Script:  '-'
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_vm_execute.h(3578) :  Freeing 0x08923620 (44 bytes), script=-
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_API.c(819) : Actual location (location was relayed)
Last leak repeated 1 time
[Fri Mar 23 08:28:26 2007]  Script:  '-'
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_variables.h(45) :  Freeing 0x089236C4 (2 bytes), script=-
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_variables.c(120) : Actual location (location was relayed)
Last leak repeated 1 time
[Fri Mar 23 08:28:26 2007]  Script:  '-'
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_vm_execute.h(3564) :  Freeing 0x089236F4 (35 bytes), script=-
/var/tmp/portage/dev-lang/php-5.2.1-r3/work/php-5.2.1/Zend/zend_hash.c(388) : Actual location (location was relayed)
Last leak repeated 1 time
=== Total 9 memory leaks detected ===