Description:
------------
When an exception is thrown from a `finally` block, if an exception has been thrown from the `finally`'s corresponding `try` block, the `finally`-thrown exception magically has the `try`-thrown exception assigned as it's `$previous`.

Test script:
---------------
<?php

try {
	try {
		throw new Exception('Foo');
	}
	finally {
		throw new Exception('Bar');
	}
}
catch(Exception $exception) {
	var_dump($exception);
}

Expected result:
----------------
Not certain, but I'd guess the `finally`-thrown exception should bubble, while the `try`-thrown exception is swallowed? Perhaps a different outcome, but what occurs is both unexpected and undocumented.

Actual result:
--------------
object(Exception)#2 (7) {
  ["message":protected]=>
  string(3) "Bar"
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  int(0)
  ["file":protected]=>
  string(9) "/in/9DMoe"
  ["line":protected]=>
  int(8)
  ["trace":"Exception":private]=>
  array(0) {
  }
  ["previous":"Exception":private]=>   <-- How is this here?
  object(Exception)#1 (7) {
    ["message":protected]=>
    string(3) "Foo"
    ["string":"Exception":private]=>
    string(0) ""
    ["code":protected]=>
    int(0)
    ["file":protected]=>
    string(9) "/in/9DMoe"
    ["line":protected]=>
    int(5)
    ["trace":"Exception":private]=>
    array(0) {
    }
    ["previous":"Exception":private]=>
    NULL
  }
}