commit c15131dd82f90a0b75996d7f5f1585d03a3cec30
Author: Joel Pittet <joel@pittet.ca>
Date:   Thu Nov 21 17:22:55 2013 -0800

    cleanup, docs, remove twig_show

diff --git a/core/lib/Drupal/Core/Template/TwigExtension.php b/core/lib/Drupal/Core/Template/TwigExtension.php
index ed616db..250dff3 100644
--- a/core/lib/Drupal/Core/Template/TwigExtension.php
+++ b/core/lib/Drupal/Core/Template/TwigExtension.php
@@ -17,6 +17,10 @@
  * @see \Drupal\Core\CoreServiceProvider
  */
 class TwigExtension extends \Twig_Extension {
+
+  /**
+   * {@inheritdoc}
+   */
   public function getFunctions() {
     return array(
       // @todo Remove URL function once http://drupal.org/node/1778610 is resolved.
@@ -26,6 +30,9 @@ public function getFunctions() {
     );
   }
 
+  /**
+   * {@inheritdoc}
+   */
   public function getFilters() {
     return array(
       't' => new \Twig_Filter_Function('t'),
@@ -42,6 +49,9 @@ public function getFilters() {
     );
   }
 
+  /**
+   * {@inheritdoc}
+   */
   public function getNodeVisitors() {
     // The node visitor is needed to wrap all variables with
     // render_var -> twig_render_var() function.
@@ -50,14 +60,13 @@ public function getNodeVisitors() {
     );
   }
 
+  /**
+   * {@inheritdoc}
+   */
   public function getTokenParsers() {
     return array(
       new TwigTransTokenParser(),
     );
   }
-
-  public function getName() {
-    return 'drupal_core';
-  }
 }
 
diff --git a/core/themes/engines/twig/twig.engine b/core/themes/engines/twig/twig.engine
index 0e62158..17e64f7 100644
--- a/core/themes/engines/twig/twig.engine
+++ b/core/themes/engines/twig/twig.engine
@@ -131,32 +131,27 @@ function twig_render_var($arg) {
 }
 
 /**
- * Wrapper around hide() that does not return the content.
+ * Sets a child's #printed property to TRUE to prevent it from rendering.
  *
- * @see hide
+ * @param mixed $element
+ *   The parent renderable array to hide the child items.
+ * @param string[] $args,...
+ *   The string keys of $element to prevent printing.
+ *
+ * @return mixed
+ *   String, Object or Render Array
  */
 function twig_hide($element) {
   if ($element instanceof TwigReference) {
     $args = func_get_args();
     if (count($args) > 1) {
-      array_shift($args);
-      foreach($args as $arg) {
-        if (isset($element[$arg])) $element[$arg]['#printed'] = TRUE;
+      unset($args[0]);
+      foreach ($args as $arg) {
+        if (isset($element[$arg])) {
+          $element[$arg]['#printed'] = TRUE;
+        }
       }
     }
   }
   return $element;
 }
-
-/**
- * Wrapper around show() that does not return the content.
- *
- * @see show
- */
-function twig_show($element) {
-  if ($element instanceof TwigReference) {
-    $element = &$element->getReference();
-    show($element);
-  }
-  // @todo Add warning in else case
-}