Description:
------------
According to the Anonymous classes RFC (https://wiki.php.net/rfc/anonymous_classes), it should not be possible to serialize them ("Serialization is not supported, and will error just as anonymous functions do.").

But it is possible to serialize them in latest snapshot (Windows) or in 3v4l.org http://3v4l.org/tIEp7 - but the unserialization fails.

When I try to serialize Closure, exception with "Serialization of 'Closure' is not allowed" is thrown.

Test script:
---------------
<?php
$instance = new class('foo') {
    public function __construct($i) {
        var_dump($i);
    }
};
var_dump($instance);
var_dump(serialize($instance));
var_dump(unserialize(serialize($instance)));

$a = function ($a) {};
var_dump($a);
var_dump(serialize($a));
var_dump(unserialize(serialize($a)));