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

vendor/symfony/console/Tests/Fixtures/DescriptorCommand1.php

@@ -0,0 +1,27 @@
+<?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\Console\Tests\Fixtures;
+
+use Symfony\Component\Console\Command\Command;
+
+class DescriptorCommand1 extends Command
+{
+    protected function configure()
+    {
+        $this
+            ->setName('descriptor:command1')
+            ->setAliases(array('alias1', 'alias2'))
+            ->setDescription('command 1 description')
+            ->setHelp('command 1 help')
+        ;
+    }
+}