Index: core/modules/user/user.module
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- core/modules/user/user.module	(revision 3b4548f90a192bac1226bef1cabeaf7945e6bb1f)
+++ core/modules/user/user.module	(revision )
@@ -531,6 +531,10 @@
       $perms += $one_role;
     }
     $perm[$account->uid] = $perms;
+    foreach (module_implements('user_access_alter') as $module) {
+      $function = $module . '_user_access_alter';
+      $function($perm, $account);
+    }
   }
 
   return isset($perm[$account->uid][$string]);