commit 9c739d4671ebc7e93a0278b2e4fe765f4cb61c89
Author: Joel Pittet <joel@pittet.ca>
Date:   Tue Feb 4 16:19:27 2014 -0800

    add doc back in

diff --git a/core/modules/forum/forum.module b/core/modules/forum/forum.module
index 3c101ed..a7e4b9e 100644
--- a/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -670,6 +670,7 @@ function template_preprocess_forums(&$variables) {
         $table['#header'] = $forum_topic_list_header;
       }
 
+      /** @var \Drupal\node\NodeInterface $topic */
       foreach ($variables['topics'] as $id => $topic) {
         $variables['topics'][$id]->icon = array(
           '#theme' => 'forum_icon',