Description:
------------
the following code segfaults on the php-cli (and on mod_php) but I expected a proper error to happen


mstaab@mst16:/tmp$ php test.php
Speicherzugriffsfehler (Speicherabzug geschrieben)
mstaab@mst16:/tmp$ php -v
PHP 7.0.32-4+ubuntu16.04.1+deb.sury.org+1 (cli) (built: Nov  4 2018 05:10:29) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.32-4+ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2017, by Zend Technologies
    with blackfire v1.23.1~linux-x64-non_zts70, https://blackfire.io, by Blackfire


Test script:
---------------
<?php
// test.php

class a {
  private $prop;

  public function __construct() {
    $this->prop = new a();
  }
}

new a();

Expected result:
----------------
no segfault

Actual result:
--------------
segfaults