Description:
------------
Iterators leak memory when assigning the results of 
each() to object properties using a list(). When the 
results are stored in local variables and then reassign, 
no leak occurs.

Reproduce code:
---------------
class ai implements Iterator {

	private $array;

	function __construct() {
		$this->array = array('foo', 'bar', 'baz');
	}

	function rewind() {
        // empty
	}

	function hasMore() {
		if (list($this->key, $this->current) = each($this->array)) {
#		if (list($key, $current) = each($this->array)) {
#			$this->key = $key;
#			$this->current = $current;
			return true;
		} else {
			return false;
		}
	}

	function key() {
		return 'key';
	}

	function current() {
		return 'current';
	}

	function next() {
		// empty
	}
}

class a implements IteratorAggregate {

	public function getIterator() {
		return new ai();
	}
}

$array = new a();
foreach ($array as $property => $value) {
	print "$property: $value\n";	
}

Expected result:
----------------
No memory leaks. Activate the commented code to see a 
working example.

Actual result:
--------------
/usr/local/cvs/php/php-src/Zend/zend_API.c(1011) :  
Freeing 0x00BC8AF8 (16 bytes), script=./
iterator_leak.php
Last leak repeated 2 times
/usr/local/cvs/php/php-src/Zend/zend_execute.c(3241) :  
Freeing 0x00BC8300 (4 bytes), script=./iterator_leak.php
/usr/local/cvs/php/php-src/Zend/zend_variables.c(137) : 
Actual location (location was relayed)
Last leak repeated 2 times
/usr/local/cvs/php/php-src/Zend/zend_execute.c(3238) :  
Freeing 0x00BC82B0 (16 bytes), script=./
iterator_leak.php
Last leak repeated 2 times
=== Total 9 memory leaks detected ===