diff -u b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php
--- b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorCategoryBlock.php
@@ -78,7 +78,7 @@
       );
       $container = array(
         '#theme' => 'container',
-        '#children' =>  drupal_render($more_link),
+        '#children' => drupal_render($more_link),
         '#attributes' => array(
           'class' => array('more-link'),
         ),
diff -u b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php
--- b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Block/AggregatorFeedBlock.php
@@ -79,7 +79,7 @@
       );
       $container = array(
         '#theme' => 'container',
-        '#children' =>  drupal_render($more_link),
+        '#children' => drupal_render($more_link),
         '#attributes' => array(
           'class' => array('more-link'),
         ),
diff -u b/core/modules/forum/forum.module b/core/modules/forum/forum.module
--- b/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -638,7 +638,7 @@
     $elements['forum_list'] = $node_title_list;
     $more_link = array(
       '#type' => 'link',
-      '#href' => 'forum', 
+      '#href' => 'forum',
       '#title' => t('More'),
       '#attributes' => array(
         '#title' => t('Read the latest forum topics.'),
@@ -646,7 +646,7 @@
     );
     $elements['forum_more'] = array(
       '#theme' => 'container',
-      '#children' =>  drupal_render($more_link),
+      '#children' => drupal_render($more_link),
       '#attributes' => array(
         'class' => array('more-link'),
       ),
diff -u b/core/modules/node/node.module b/core/modules/node/node.module
--- b/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -1553,7 +1553,7 @@
       );
       $container = array(
         '#theme' => 'container',
-        '#children' =>  drupal_render($more_link),
+        '#children' => drupal_render($more_link),
         '#attributes' => array(
           'class' => array('more-link'),
         ),
diff -u b/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/EventSubscriber/ThemeTestSubscriber.php b/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/EventSubscriber/ThemeTestSubscriber.php
--- b/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/EventSubscriber/ThemeTestSubscriber.php
+++ b/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/EventSubscriber/ThemeTestSubscriber.php
@@ -36,7 +36,7 @@
       // returning output and theming the page as a whole.
       $more_link = array(
         '#type' => 'link',
-        '#href' => 'user', 
+        '#href' => 'user',
         '#title' => t('More'),
         '#attributes' => array(
           '#title' => t('Themed output generated in a KernelEvents::REQUEST listener'),
@@ -44,7 +44,7 @@
       );
       $container = array(
         '#theme' => 'container',
-        '#children' =>  drupal_render($more_link),
+        '#children' => drupal_render($more_link),
         '#attributes' => array(
           'class' => array('more-link'),
         ),