Description:
------------
Having an anonymous function as a class property and executing it with 
call_user_func() or call_user_func_array() causes PHP to crash.

Test script:
---------------
class Foo {
	function __call($name, $args) {
		call_user_func(array($this, $name), $args);
	}
}

$bar = new Foo;
$bar->prop = function(){};
$bar->prop();

/* circumventing it can be achieved with the following: */
$method = $this->{$name};
call_user_func($method, $args);

Expected result:
----------------
Successful exeuction of anonymous function (or at least an error message).

Actual result:
--------------
PHP crashes.