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diff --git a/vendor/symfony/config/Resource/ResourceInterface.php b/vendor/symfony/config/Resource/ResourceInterface.php
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+++ b/vendor/symfony/config/Resource/ResourceInterface.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\Config\Resource;
+
+/**
+ * ResourceInterface is the interface that must be implemented by all Resource classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface ResourceInterface
+{
+    /**
+     * Returns a string representation of the Resource.
+     *
+     * This method is necessary to allow for resource de-duplication, for example by means
+     * of array_unique(). The string returned need not have a particular meaning, but has
+     * to be identical for different ResourceInterface instances referring to the same
+     * resource; and it should be unlikely to collide with that of other, unrelated
+     * resource instances.
+     *
+     * @return string A string representation unique to the underlying Resource
+     */
+    public function __toString();
+
+    /**
+     * Returns true if the resource has not been updated since the given timestamp.
+     *
+     * @param int $timestamp The last time the resource was loaded
+     *
+     * @return bool True if the resource has not been updated, false otherwise
+     *
+     * @deprecated since 2.8, to be removed in 3.0. If your resource can check itself for
+     *             freshness implement the SelfCheckingResourceInterface instead.
+     */
+    public function isFresh($timestamp);
+
+    /**
+     * Returns the tied resource.
+     *
+     * @return mixed The resource
+     *
+     * @deprecated since 2.8, to be removed in 3.0. As there are many different kinds of resource,
+     *             a single getResource() method does not make sense at the interface level. You
+     *             can still call getResource() on implementing classes, probably after performing
+     *             a type check. If you know the concrete type of Resource at hand, the return value
+     *             of this method may make sense to you.
+     */
+    public function getResource();
+}