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

vendor/symfony/translation/Loader/YamlFileLoader.php

@@ -0,0 +1,78 @@
+<?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\Loader;
+
+use Symfony\Component\Translation\Exception\InvalidResourceException;
+use Symfony\Component\Translation\Exception\NotFoundResourceException;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Yaml\Parser as YamlParser;
+use Symfony\Component\Yaml\Exception\ParseException;
+
+/**
+ * YamlFileLoader loads translations from Yaml files.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @api
+ */
+class YamlFileLoader extends ArrayLoader
+{
+    private $yamlParser;
+
+    /**
+     * {@inheritdoc}
+     *
+     * @api
+     */
+    public function load($resource, $locale, $domain = 'messages')
+    {
+        if (!stream_is_local($resource)) {
+            throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
+        }
+
+        if (!file_exists($resource)) {
+            throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
+        }
+
+        if (!class_exists('Symfony\Component\Yaml\Parser')) {
+            throw new \LogicException('Loading translations from the YAML format requires the Symfony Yaml component.');
+        }
+
+        if (null === $this->yamlParser) {
+            $this->yamlParser = new YamlParser();
+        }
+
+        try {
+            $messages = $this->yamlParser->parse(file_get_contents($resource));
+        } catch (ParseException $e) {
+            throw new InvalidResourceException(sprintf('Error parsing YAML, invalid file "%s"', $resource), 0, $e);
+        }
+
+        // empty file
+        if (null === $messages) {
+            $messages = array();
+        }
+
+        // not an array
+        if (!is_array($messages)) {
+            throw new InvalidResourceException(sprintf('The file "%s" must contain a YAML array.', $resource));
+        }
+
+        $catalogue = parent::load($messages, $locale, $domain);
+
+        if (class_exists('Symfony\Component\Config\Resource\FileResource')) {
+            $catalogue->addResource(new FileResource($resource));
+        }
+
+        return $catalogue;
+    }
+}