Description:
------------
In PHP 7.0.4 the script below worked correctly, the result was TRUE. It's not the case in PHP 7.0.5 it seems that the reference inside the switch and case statements is not working correctly.

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

function bar(&$b)
{
    switch ($b) {
        case 'bar':
            $b = null;
    }
}

$a = ['foo' => 'bar'];

bar($a['foo']);

var_dump(null === $a['foo']);

Expected result:
----------------
bool(true)

Actual result:
--------------
bool(false)