Description:
------------
My code converts errors to exceptions, but it turned out that when faced with 
"Failed opening required 'whatever'" error, exception handler doesn't get called. 
More precisely, it doesn't work for require, but works for include.

I tested it on debian 6.0.6 (php-5.4.15), on arch linux (php-5.4.17) and on 
windows 7 (php-5.4.17).

Test script:
---------------
#!/usr/bin/env php
<?php

set_error_handler(function() {
    echo "error\n";
    throw new Exception;
});
set_exception_handler(function() {
    echo "exception\n";
});
require 'asdf';


Expected result:
----------------
error
exception


Actual result:
--------------
error
PHP Warning:  Uncaught exception 'Exception' in /home/yuri/1.php:6
Stack trace:
#0 /home/yuri/1.php(11): {closure}(2, 'require(asdf): ...', '/home/yuri/1.ph...', 
11, Array)
#1 /home/yuri/1.php(11): require()
#2 {main}
  thrown in /home/yuri/1.php on line 6
PHP Fatal error:  main(): Failed opening required 'asdf' 
(include_path='.:/usr/share/php:/usr/share/pear') in /home/yuri/1.php on line 11