reverted:
--- b/core/modules/system/system.module
+++ a/core/modules/system/system.module
@@ -10,7 +10,6 @@
 use Drupal\Core\Asset\AttachedAssetsInterface;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Queue\QueueGarbageCollectionInterface;
-use Drupal\Core\Requirements;
 use Drupal\Core\Database\Query\AlterableInterface;
 use Drupal\Core\Extension\Extension;
 use Drupal\Core\Form\FormStateInterface;