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

vendor/symfony/translation/Extractor/ChainExtractor.php

@@ -0,0 +1,60 @@
+<?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\Translation\Extractor;
+
+use Symfony\Component\Translation\MessageCatalogue;
+
+/**
+ * ChainExtractor extracts translation messages from template files.
+ *
+ * @author Michel Salib <michelsalib@hotmail.com>
+ */
+class ChainExtractor implements ExtractorInterface
+{
+    /**
+     * The extractors.
+     *
+     * @var ExtractorInterface[]
+     */
+    private $extractors = array();
+
+    /**
+     * Adds a loader to the translation extractor.
+     *
+     * @param string             $format    The format of the loader
+     * @param ExtractorInterface $extractor The loader
+     */
+    public function addExtractor($format, ExtractorInterface $extractor)
+    {
+        $this->extractors[$format] = $extractor;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setPrefix($prefix)
+    {
+        foreach ($this->extractors as $extractor) {
+            $extractor->setPrefix($prefix);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function extract($directory, MessageCatalogue $catalogue)
+    {
+        foreach ($this->extractors as $extractor) {
+            $extractor->extract($directory, $catalogue);
+        }
+    }
+}