commit 5e69599ba0e009a9cc4517179051e8195fb28d05
Author: Joel Pittet <joel@pittet.ca>
Date:   Sun Jan 5 18:56:42 2014 -0800

    remove edge cases

diff --git a/core/themes/engines/twig/twig.engine b/core/themes/engines/twig/twig.engine
index 50d461a..84f26b0 100644
--- a/core/themes/engines/twig/twig.engine
+++ b/core/themes/engines/twig/twig.engine
@@ -133,24 +133,20 @@ function twig_render_var($arg) {
 /**
  * Sets a child's #printed property to TRUE to prevent it from rendering.
  *
- * @param mixed $element
+ * @param TwigReference $element
  *   The parent renderable array to hide the child items.
  * @param string[] $args,...
  *   The string keys of $element to prevent printing.
  *
- * @return mixed
- *   String, Object or Render Array
+ * @return TwigReference
+ *   A TwigReference of a renderable array.
  */
-function twig_hide($element) {
-  if ($element instanceof TwigReference) {
-    $args = func_get_args();
-    if (count($args) > 1) {
-      unset($args[0]);
-      foreach ($args as $arg) {
-        if (isset($element[$arg])) {
-          $element[$arg]['#printed'] = TRUE;
-        }
-      }
+function twig_hide(TwigReference $element) {
+  $args = func_get_args();
+  unset($args[0]);
+  foreach ($args as $arg) {
+    if (isset($element[$arg])) {
+      $element[$arg]['#printed'] = TRUE;
     }
   }
   return $element;