Description:
------------
One reference passing fail with call_user_func_array() causes other fails.
HHVM is already fixed on this issue, however, PHP 7 still has this problem.
http://3v4l.org/jd9Nd

Test script:
---------------
<?php
function inc(&$a, &$b) {
    ++$a; ++$b;
}
$a = 1;
$b = 1;
$params = array($a, &$b);
call_user_func_array('inc', $params);
var_dump($params);

Expected result:
----------------
Warning: Parameter 1 to inc() expected to be a reference, value given in ... on line ...
array(2) {
  [0]=>
  int(1)
  [1]=>
  &int(2)
}

Actual result:
--------------
Warning: Parameter 1 to inc() expected to be a reference, value given in ... on line ...
array(2) {
  [0]=>
  int(1)
  [1]=>
  &int(1)
}