Description:
------------
When the destructor issues an exception, it goes unhandled (obviously), however tossing a fatal does not seem like the appropriate course of action.

Fatal error: Exception thrown without a stack frame in Unknown on line 0

Reproduce code:
---------------
<?php
class MyClass {
  function __destruct(){
    throw new Exception('fail');
  }
}
$n = new MyClass();
?>

Expected result:
----------------
A warning?  Something other than a non descriptive fatal.