diff --git a/core/includes/utility.inc b/core/includes/utility.inc
index c3fc86fee10bbca724a3789aae30e53133739d12..3a6ef0bde28981a10d0d563aac0c3f1462479479 100644
--- a/core/includes/utility.inc
+++ b/core/includes/utility.inc
@@ -15,8 +15,7 @@
  *
  * @param $class_loader
  *   The class loader. Normally Composer's ClassLoader, as included by the
- *   front controller, but may also be decorated; e.g.,
- *   \Symfony\Component\ClassLoader\ApcClassLoader, \Symfony\Component\ClassLoader\WinCacheClassLoader, or \Symfony\Component\ClassLoader\XcacheClassLoader
+ *   front controller, but may also be decorated.
  * @param \Symfony\Component\HttpFoundation\Request $request
  *   The current request.
  *
diff --git a/core/misc/cspell/dictionary.txt b/core/misc/cspell/dictionary.txt
index 6fb841979dd442533ce6b16f23cc78b92c1528ad..cc9377e6e471bed9a7d31d62a5085f61cf23a963 100644
--- a/core/misc/cspell/dictionary.txt
+++ b/core/misc/cspell/dictionary.txt
@@ -2053,7 +2053,6 @@ xampl
 xbap
 xbeg
 xbitmap
-xcache
 xfbml
 xhr's
 xjkm
diff --git a/core/rebuild.php b/core/rebuild.php
index 2bcab5bd74683ba94dba8566699616e8c2f2f4fe..612df7c3eea5663916f46cc868b20cb2a15b6eb4 100644
--- a/core/rebuild.php
+++ b/core/rebuild.php
@@ -46,7 +46,6 @@
   $user_caches = [
     'apcu_clear_cache',
     'wincache_ucache_clear',
-    'xcache_clear_cache',
   ];
   array_map('call_user_func', array_filter($user_caches, 'is_callable'));