Description:
------------
There seems to be a bug when passing the result of an assignation to a function expecting a reference.

I extracted a snippet from atoum where we use a trick to verify if a variable is a reference to another and saw from the tests that PHP7's behavior changed

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

// http://3v4l.org/UrMbA

function cmp(& $reference, & $value) {
    $tmp = $reference;
	$reference = uniqid(mt_rand());
	$isReference = ($value === $reference);
	$reference = $tmp;  
	
	return $isReference;
}

$value = uniqid();
$reference = & $value;
var_dump(cmp($reference, $value));

$value = new \exception();
var_dump(cmp($reference, $value));

var_dump(cmp($reference, $value = new \exception()));

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

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