diff -u b/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
--- b/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -4,17 +4,23 @@
  * Functions that need to be loaded on every Drupal request.
  */
 
+use Drupal\Component\Datetime\DateTimePlus;
 use Drupal\Component\Utility\Crypt;
+use Drupal\Component\Utility\Environment;
 use Drupal\Component\Utility\Html;
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Component\Utility\Unicode;
 use Drupal\Core\DrupalKernel;
+use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\Core\Logger\RfcLogLevel;
 use Drupal\Core\Render\SafeString;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\Site\Settings;
 use Drupal\Core\Utility\Error;
+use Symfony\Component\ClassLoader\ApcClassLoader;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Drupal\Core\Language\LanguageInterface;
 
 /**
  * Minimum supported version of PHP.