Description:
------------
Using a reference variable to $this within an anonymous function, in a class 
function causes a segfault. This previously worked in PHP 5.3.5.

The segfault can be caused either when using the function as a closure, or as an 
anonymous function.

The GDB output:


GNU gdb 6.3.50-20050815 (Apple version gdb-1705) (Fri Jul  1 10:50:06 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared 
libraries ...................... done

(gdb) run segfault.php
Starting program: /usr/bin/php segfault.php
Reading symbols for shared libraries 
+++++++++++++++++++++...........................................................
............................................................... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x00000001ffffffff
0x000000010035d53d in zend_std_get_method ()


Test script:
---------------
<?php
class Seg
{	
	public function fault()
	{
		$that = &$this;
		$callback = function() use ($that){};
		$callback(); // Causes a segfault 
		is_callable(function() use ($that){}); // Causes a segfault
	}
}

$obj = new Seg();
for($i = 0; $i < 5000; $i++)
{
	$obj->fault();
}

Expected result:
----------------
No segfault

Actual result:
--------------
Segfault