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

vendor/symfony/validator/Constraints/Isbn.php

@@ -0,0 +1,67 @@
+<?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\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * @Annotation
+ * @Target({"PROPERTY", "METHOD", "ANNOTATION"})
+ *
+ * @author The Whole Life To Learn <thewholelifetolearn@gmail.com>
+ * @author Manuel Reinhard <manu@sprain.ch>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class Isbn extends Constraint
+{
+    const TOO_SHORT_ERROR = 1;
+    const TOO_LONG_ERROR = 2;
+    const INVALID_CHARACTERS_ERROR = 3;
+    const CHECKSUM_FAILED_ERROR = 4;
+    const TYPE_NOT_RECOGNIZED_ERROR = 5;
+
+    protected static $errorNames = array(
+        self::TOO_SHORT_ERROR => 'TOO_SHORT_ERROR',
+        self::TOO_LONG_ERROR => 'TOO_LONG_ERROR',
+        self::INVALID_CHARACTERS_ERROR => 'INVALID_CHARACTERS_ERROR',
+        self::CHECKSUM_FAILED_ERROR => 'CHECKSUM_FAILED_ERROR',
+        self::TYPE_NOT_RECOGNIZED_ERROR => 'TYPE_NOT_RECOGNIZED_ERROR',
+    );
+
+    public $isbn10Message = 'This value is not a valid ISBN-10.';
+    public $isbn13Message = 'This value is not a valid ISBN-13.';
+    public $bothIsbnMessage = 'This value is neither a valid ISBN-10 nor a valid ISBN-13.';
+    public $type;
+    public $message;
+
+    /**
+     * @deprecated since version 2.5, to be removed in 3.0. Use option "type" instead.
+     *
+     * @var bool
+     */
+    public $isbn10 = false;
+
+    /**
+     * @deprecated since version 2.5, to be removed in 3.0. Use option "type" instead.
+     *
+     * @var bool
+     */
+    public $isbn13 = false;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDefaultOption()
+    {
+        return 'type';
+    }
+}