function rename_role($role_name_old, $role_type = 'rs')
 {
     $role_name_new = $_POST['role-name'];
     if (!$role_name_old) {
         return;
     }
     global $wpdb;
     scoper_query("UPDATE {$wpdb->user2role2object_rs} SET role_name = '{$role_name_new}' WHERE role_type = '{$role_type}' AND role_name = '{$role_name_old}'");
     ScoperAdminLib::schedule_role_sync();
     // sync_wp_roles() will also flush cache on role rename
 }