Description:
------------
IF you eval a class during preload, you cannot instantiate it, but you can extend from it and class_parents shows its as parent. 

Test script:
---------------
// index.php
<?php
var_dump(class_exists(Foo::class));
var_dump(class_exists(Bar::class));
ini_set('display_errors', true);
var_dump(new Bar());
var_dump(class_parents('Bar'));
var_dump(new Foo());

// preload.php
<?php
eval("class Foo {}");
class Bar extends Foo {
}

Expected result:
----------------
bool(false) bool(true) object(Bar)#1 (0) { } array(1) { ["Foo"]=> string(3) "Foo" }
object(Foo)#2 (0) { }

Actual result:
--------------
bool(false) bool(true) object(Bar)#1 (0) { } array(1) { ["Foo"]=> string(3) "Foo" }
Fatal error: Uncaught Error: Class 'Foo' not found in /var/www/preload/index.php:10 Stack trace: #0 /home/benny/.symfony/php/a37c6f52bd8b76a9d0374711bf78143b455254a2-router.php(29): require() #1 {main} thrown in /var/www/preload/index.php on line 10