Description:
------------
none

Test script:
---------------
<?php

$a = 0;

$b = $a->b->i -= 0;

var_dump($b);

?>

Expected result:
----------------
none memleak

Actual result:
--------------
[Sun Aug 21 17:33:47 2016]  Script:  '/tmp/1.php'
/home/huixinchen/opensource/php-7.0/Zend/zend_objects.c(162) :  Freeing 0x7FFFF0880050 (40 bytes), script=/tmp/1.php
=== Total 1 memory leaks detected ===