Description:
------------
If a fatal error occurs buffer contents are disclosured.

Test script:
---------------
<?php
set_time_limit(1);
ob_start();
echo "You shouldn't see this!";
sleep(2); //comment this and you won't see the line above in output ;)
ob_end_clean();
?>

Expected result:
----------------
I expected not seeing "You shouldn't see this!" and just the fatal error

Actual result:
--------------
I see "You shouldn't see this!" and the fatal error