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

vendor/symfony/validator/Constraints/Choice.php

@@ -0,0 +1,54 @@
+<?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 Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @api
+ */
+class Choice extends Constraint
+{
+    const NO_SUCH_CHOICE_ERROR = 1;
+    const TOO_FEW_ERROR = 2;
+    const TOO_MANY_ERROR = 3;
+
+    protected static $errorNames = array(
+        self::NO_SUCH_CHOICE_ERROR => 'NO_SUCH_CHOICE_ERROR',
+        self::TOO_FEW_ERROR => 'TOO_FEW_ERROR',
+        self::TOO_MANY_ERROR => 'TOO_MANY_ERROR',
+    );
+
+    public $choices;
+    public $callback;
+    public $multiple = false;
+    public $strict = false;
+    public $min;
+    public $max;
+    public $message = 'The value you selected is not a valid choice.';
+    public $multipleMessage = 'One or more of the given values is invalid.';
+    public $minMessage = 'You must select at least {{ limit }} choice.|You must select at least {{ limit }} choices.';
+    public $maxMessage = 'You must select at most {{ limit }} choice.|You must select at most {{ limit }} choices.';
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDefaultOption()
+    {
+        return 'choices';
+    }
+}