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vendor/symfony/http-kernel/DependencyInjection/Extension.php

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+<?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\HttpKernel\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\Extension\Extension as BaseExtension;
+
+/**
+ * Allow adding classes to the class cache.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal to be deprecated in 8.1; use Symfony\Component\DependencyInjection\Extension\Extension instead
+ */
+abstract class Extension extends BaseExtension
+{
+}