diff -u b/core/lib/Drupal/Core/Cache/MemoryBackend.php b/core/lib/Drupal/Core/Cache/MemoryBackend.php
--- b/core/lib/Drupal/Core/Cache/MemoryBackend.php
+++ b/core/lib/Drupal/Core/Cache/MemoryBackend.php
@@ -34,7 +34,7 @@
   protected $cache = array();
 
   /**
-   * Constructs a DatabaseBackend object.
+   * Constructs a MemoryBackend object.
    *
    * @param \Drupal\Component\Serialization\SerializationInterface $serializer
    *   The serialization class to use.
diff -u b/core/lib/Drupal/Core/Config/StorageComparer.php b/core/lib/Drupal/Core/Config/StorageComparer.php
--- b/core/lib/Drupal/Core/Config/StorageComparer.php
+++ b/core/lib/Drupal/Core/Config/StorageComparer.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Core\Config;
 
-use Drupal\Component\Serialization\PhpSerialize;
 use Drupal\Core\Cache\MemoryBackend;
 use Drupal\Core\Config\Entity\ConfigDependencyManager;
 use Drupal\Core\DependencyInjection\DependencySerializationTrait;