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

vendor/symfony/validator/Mapping/PropertyMetadata.php

@@ -0,0 +1,71 @@
+<?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\Mapping;
+
+use Symfony\Component\Validator\Exception\ValidatorException;
+
+/**
+ * Stores all metadata needed for validating a class property.
+ *
+ * The value of the property is obtained by directly accessing the property.
+ * The property will be accessed by reflection, so the access of private and
+ * protected properties is supported.
+ *
+ * This class supports serialization and cloning.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @see PropertyMetadataInterface
+ */
+class PropertyMetadata extends MemberMetadata
+{
+    /**
+     * Constructor.
+     *
+     * @param string $class The class this property is defined on
+     * @param string $name  The name of this property
+     *
+     * @throws ValidatorException
+     */
+    public function __construct($class, $name)
+    {
+        if (!property_exists($class, $name)) {
+            throw new ValidatorException(sprintf('Property %s does not exist in class %s', $name, $class));
+        }
+
+        parent::__construct($class, $name, $name);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPropertyValue($object)
+    {
+        return $this->getReflectionMember($object)->getValue($object);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function newReflectionMember($objectOrClassName)
+    {
+        $class = new \ReflectionClass($objectOrClassName);
+        while (!$class->hasProperty($this->getName())) {
+            $class = $class->getParentClass();
+        }
+
+        $member = new \ReflectionProperty($class->getName(), $this->getName());
+        $member->setAccessible(true);
+
+        return $member;
+    }
+}