diff --git a/core/modules/book/book.module b/core/modules/book/book.module
index f55f5d6fd7e0..f9a6ad21a14e 100644
--- a/core/modules/book/book.module
+++ b/core/modules/book/book.module
@@ -88,7 +88,7 @@ function book_entity_type_build(array &$entity_types) {
 /**
  * Implements hook_node_links_alter().
  */
-function book_node_links_alter(array &$node_links, NodeInterface $node, array &$context) {
+function book_node_links_alter(array &$links, NodeInterface $node, array &$context) {
   if ($context['view_mode'] != 'rss') {
     $account = \Drupal::currentUser();
 
@@ -97,14 +97,14 @@ function book_node_links_alter(array &$node_links, NodeInterface $node, array &$
         $child_type = \Drupal::config('book.settings')->get('child_type');
         $access_control_handler = \Drupal::entityManager()->getAccessControlHandler('node');
         if (($account->hasPermission('add content to books') || $account->hasPermission('administer book outlines')) && $access_control_handler->createAccess($child_type) && $node->isPublished() && $node->book['depth'] < BookManager::BOOK_MAX_DEPTH) {
-          $links['book_add_child'] = array(
+          $book_links['book_add_child'] = array(
             'title' => t('Add child page'),
             'url' => Url::fromRoute('node.add', ['node_type' => $child_type], ['query' => ['parent' => $node->id()]]),
           );
         }
 
         if ($account->hasPermission('access printer-friendly version')) {
-          $links['book_printer'] = array(
+          $book_links['book_printer'] = array(
             'title' => t('Printer-friendly version'),
             'url' => Url::fromRoute('book.export', [
               'type' => 'html',
@@ -116,10 +116,10 @@ function book_node_links_alter(array &$node_links, NodeInterface $node, array &$
       }
     }
 
-    if (!empty($links)) {
-      $node_links['book'] = array(
+    if (!empty($book_links)) {
+      $links['book'] = array(
         '#theme' => 'links__node__book',
-        '#links' => $links,
+        '#links' => $book_links,
         '#attributes' => array('class' => array('links', 'inline')),
       );
     }
diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index e1d74b6a4709..8736b901b7ab 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -194,15 +194,15 @@ function comment_field_config_delete(FieldConfigInterface $field) {
 /**
  * Implements hook_node_links_alter().
  */
-function comment_node_links_alter(array &$node_links, NodeInterface $node, array &$context) {
+function comment_node_links_alter(array &$links, NodeInterface $node, array &$context) {
   // Comment links are only added to node entity type for backwards
   // compatibility. Should you require comment links for other entity types you
   // can do so by implementing a new field formatter.
   // @todo Make this configurable from the formatter. See
   //   https://www.drupal.org/node/1901110.
 
-  $links = \Drupal::service('comment.link_builder')->buildCommentedEntityLinks($node, $context);
-  $node_links += $links;
+  $comment_links = \Drupal::service('comment.link_builder')->buildCommentedEntityLinks($node, $context);
+  $links += $comment_links;
 }
 
 /**
diff --git a/core/modules/statistics/statistics.module b/core/modules/statistics/statistics.module
index 61d58e291984..5079e43cb322 100644
--- a/core/modules/statistics/statistics.module
+++ b/core/modules/statistics/statistics.module
@@ -48,20 +48,20 @@ function statistics_node_view(array &$build, EntityInterface $node, EntityViewDi
 /**
  * Implements hook_node_links_alter().
  */
-function statistics_node_links_alter(array &$node_links, NodeInterface $entity, array &$context) {
+function statistics_node_links_alter(array &$links, NodeInterface $entity, array &$context) {
   if ($context['view_mode'] != 'rss') {
-    $node_links['#cache']['contexts'][] = 'user.permissions';
+    $links['#cache']['contexts'][] = 'user.permissions';
     if (\Drupal::currentUser()->hasPermission('view post access counter')) {
       $statistics = statistics_get($entity->id());
       if ($statistics) {
-        $links['statistics_counter']['title'] = \Drupal::translation()->formatPlural($statistics['totalcount'], '1 view', '@count views');
-        $node_links['statistics'] = array(
+        $statistics_links['statistics_counter']['title'] = \Drupal::translation()->formatPlural($statistics['totalcount'], '1 view', '@count views');
+        $links['statistics'] = array(
           '#theme' => 'links__node__statistics',
-          '#links' => $links,
+          '#links' => $statistics_links,
           '#attributes' => array('class' => array('links', 'inline')),
         );
       }
-      $node_links['#cache']['max-age'] = \Drupal::config('statistics.settings')->get('display_max_age');
+      $links['#cache']['max-age'] = \Drupal::config('statistics.settings')->get('display_max_age');
     }
   }
 }