Description:
------------
Please, check the code.

P.S. When $this is returned instead of "null" you do get the correct error message, but PHP still crashes.

P.P.S. What do we have Traversable interface for?


Reproduce code:
---------------
<?php

class ArrayObj extends ArrayObject {
	function getIterator() { return $this; }
}

foreach(new ArrayObj(array(123)) as $idx => $line) {
	echo "$idx: $line\n";
}

?>

Expected result:
----------------
Warning: Objects returned by ArrayObj::getIterator() must be traversable or implement interface Iterator in ... on line 7

Actual result:
--------------
*SILENT CRASH*