Description:
------------
This bug was pretty hard to track down. I uploaded a test script to make it 
clear.
These conditions need to be met to trigger the bug:
1. You use a custom error handler
2. You use namespaces
3. You use the "use" statement
4. You require a class within the error handler
5. You have a class that uses a deprecated = & new Classname() statment
Using an autoloader is no workaround because the system thinks the namespaced 
class is available (class_exists() returns true).
Test script:
---------------
To reproduce the bug several files are needed. I uploaded a test script. You can download it here:
https://docs.google.com/file/d/0Bz4hXLAjQnaiRlJWblNuX1psdzg/edit?usp=sharing
No Google account required for download!
Please call index.php and you will see an error:
Fatal error: Class 'namespaced_class' not found in requireerror/deprecated_reference.php on line 42
Please have a look at the code to see how it occurs.
Expected result:
----------------
I expect the class that is found by class_exists() and included with a "use" 
statement is accessible.
Actual result:
--------------
I get an error:
Fatal error: Class 'namespaced_class' not found in deprecated_reference.php on 
line 31