Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/validator/Mapping/Loader/LoaderInterface.php

@@ -0,0 +1,31 @@
+<?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\Validator\Mapping\Loader;
+
+use Symfony\Component\Validator\Mapping\ClassMetadata;
+
+/**
+ * Loads validation metadata into {@link ClassMetadata} instances.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface LoaderInterface
+{
+    /**
+     * Loads validation metadata into a {@link ClassMetadata} instance.
+     *
+     * @param ClassMetadata $metadata The metadata to load
+     *
+     * @return bool Whether the loader succeeded
+     */
+    public function loadClassMetadata(ClassMetadata $metadata);
+}