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

vendor/symfony/dependency-injection/ParameterBag/FrozenParameterBag.php

@@ -0,0 +1,82 @@
+<?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\DependencyInjection\ParameterBag;
+
+use Symfony\Component\DependencyInjection\Exception\LogicException;
+
+/**
+ * Holds read-only parameters.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @api
+ */
+class FrozenParameterBag extends ParameterBag
+{
+    /**
+     * Constructor.
+     *
+     * For performance reasons, the constructor assumes that
+     * all keys are already lowercased.
+     *
+     * This is always the case when used internally.
+     *
+     * @param array $parameters An array of parameters
+     *
+     * @api
+     */
+    public function __construct(array $parameters = array())
+    {
+        $this->parameters = $parameters;
+        $this->resolved = true;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @api
+     */
+    public function clear()
+    {
+        throw new LogicException('Impossible to call clear() on a frozen ParameterBag.');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @api
+     */
+    public function add(array $parameters)
+    {
+        throw new LogicException('Impossible to call add() on a frozen ParameterBag.');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @api
+     */
+    public function set($name, $value)
+    {
+        throw new LogicException('Impossible to call set() on a frozen ParameterBag.');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @api
+     */
+    public function remove($name)
+    {
+        throw new LogicException('Impossible to call remove() on a frozen ParameterBag.');
+    }
+}