diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Config/Definition/Exception/UnsetKeyException.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Config/Definition/Exception/UnsetKeyException.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Config\Definition\Exception;
+
+/**
+ * This exception is usually not encountered by the end-user, but only used
+ * internally to signal the parent scope to unset a key.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class UnsetKeyException extends Exception
+{
+}