diff -u b/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
--- b/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -4,23 +4,17 @@
  * 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.
@@ -223,6 +217,7 @@
 
   // Profiles are converted into modules in system_rebuild_module_data().
   // @todo Remove false-exposure of profiles as modules.
+  $original_type = $type;
   if ($type == 'profile') {
     $type = 'module';
   }
@@ -232,8 +227,7 @@
 
   // Profiles are converted into modules in system_rebuild_module_data().
   // @todo Remove false-exposure of profiles as modules.
-  $original_type = $type;
-  if ($type == 'profile') {
+  if ($type === 'profile') {
     $type = 'module';
   }
   if (!isset($files[$type])) {
@@ -1021,7 +1015,7 @@
   chdir(DRUPAL_ROOT);
 
   try {
-    while (list($key, $callback) = each($callbacks)) {
+    foreach ($callbacks as $callback) {
       call_user_func_array($callback['callback'], $callback['arguments']);
     }
   }