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

vendor/symfony/http-kernel/DataCollector/ExceptionDataCollector.php

@@ -0,0 +1,104 @@
+<?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\HttpKernel\DataCollector;
+
+use Symfony\Component\Debug\Exception\FlattenException;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * ExceptionDataCollector.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ExceptionDataCollector extends DataCollector
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function collect(Request $request, Response $response, \Exception $exception = null)
+    {
+        if (null !== $exception) {
+            $this->data = array(
+                'exception' => FlattenException::create($exception),
+            );
+        }
+    }
+
+    /**
+     * Checks if the exception is not null.
+     *
+     * @return bool true if the exception is not null, false otherwise
+     */
+    public function hasException()
+    {
+        return isset($this->data['exception']);
+    }
+
+    /**
+     * Gets the exception.
+     *
+     * @return \Exception The exception
+     */
+    public function getException()
+    {
+        return $this->data['exception'];
+    }
+
+    /**
+     * Gets the exception message.
+     *
+     * @return string The exception message
+     */
+    public function getMessage()
+    {
+        return $this->data['exception']->getMessage();
+    }
+
+    /**
+     * Gets the exception code.
+     *
+     * @return int The exception code
+     */
+    public function getCode()
+    {
+        return $this->data['exception']->getCode();
+    }
+
+    /**
+     * Gets the status code.
+     *
+     * @return int The status code
+     */
+    public function getStatusCode()
+    {
+        return $this->data['exception']->getStatusCode();
+    }
+
+    /**
+     * Gets the exception trace.
+     *
+     * @return array The exception trace
+     */
+    public function getTrace()
+    {
+        return $this->data['exception']->getTrace();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'exception';
+    }
+}