commit 60dfd64bf264ad2be1dc82f1a9d4b0fa11295a54
Author: Stefan Marr <gron@php.net>
Date:   Sun Mar 4 18:26:11 2012 +0000

    Fixed Bug #60717 (Order of traits in use statement can cause a fatal error)
    # Compatibility is now correctly checked in both directions.
    # Introduced helper method for the test.
