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

vendor/symfony/validator/Constraints/AbstractComparison.php

@@ -0,0 +1,49 @@
+<?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;
+use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
+
+/**
+ * Used for the comparison of values.
+ *
+ * @author Daniel Holmes <daniel@danielholmes.org>
+ */
+abstract class AbstractComparison extends Constraint
+{
+    public $message;
+    public $value;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($options = null)
+    {
+        if (is_array($options) && !isset($options['value'])) {
+            throw new ConstraintDefinitionException(sprintf(
+                'The %s constraint requires the "value" option to be set.',
+                get_class($this)
+            ));
+        }
+
+        parent::__construct($options);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDefaultOption()
+    {
+        return 'value';
+    }
+}