commit 7b921de2c2b71387b3734de901856ff226ef3668
Author: Joel Pittet <joel@pittet.ca>
Date:   Mon May 27 20:50:17 2013 -0700

    move contact to array

diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index ada8d79..d89247e 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -12,9 +12,9 @@
 use Drupal\Core\Config\Config;
 use Drupal\Core\Language\Language;
 use Drupal\Core\Template\Attribute;
+use Drupal\Core\Template\RenderableWrapper;
 use Drupal\Core\Utility\ThemeRegistry;
 use Drupal\Core\Theme\ThemeSettings;
-use Drupal\Core\Template\RenderableWrapper;
 
 /**
  * @defgroup content_flags Content markers
@@ -2855,19 +2855,21 @@ function template_preprocess_html(&$variables) {
   // Previous process layer.
   drupal_add_library('system', 'html5shiv', TRUE);
   // Render page_top and page_bottom into top level variables.
-  $variables['page_top'] = isset($variables['page']['page_top']) ? drupal_render($variables['page']['page_top']) : '';
-  $variables['page_bottom'] = isset($variables['page']['page_bottom']) ? drupal_render($variables['page']['page_bottom']) : '';
+  $variables['page_top'] = isset($variables['page']['page_top']) ? $variables['page']['page_top'] : array();
+  $variables['page_bottom'] = array();
+  $variables['page_bottom'][] = isset($variables['page']['page_bottom']) ? $variables['page']['page_bottom'] : array();
   // Place the rendered HTML for the page body into a top level variable.
   $variables['page'] = $variables['page']['#children'];
-
-  $variables['head'] = drupal_get_html_head();
   $variables['css'] = drupal_add_css();
 
   // Replaced drupal_get_css() and drupal_get_js() so they return an object
   // that can render itself on print.
+  $variables['head'] = new RenderableWrapper('drupal_get_html_head');
   $variables['styles'] = new RenderableWrapper('drupal_get_css');
   $variables['scripts'] = new RenderableWrapper('drupal_get_js');
-  $variables['page_bottom'] = new RenderableWrapper('drupal_get_js', $args = array('footer'));
+
+  $footer_scripts = new RenderableWrapper('drupal_get_js', array('footer'));
+  $variables['page_bottom'][] = array('#markup' => $footer_scripts);
 }
 
 /**
diff --git a/core/lib/Drupal/Core/Template/RenderableWrapper.php b/core/lib/Drupal/Core/Template/RenderableWrapper.php
index f7b2bb6..200d16b 100644
--- a/core/lib/Drupal/Core/Template/RenderableWrapper.php
+++ b/core/lib/Drupal/Core/Template/RenderableWrapper.php
@@ -9,11 +9,37 @@
 
 
 /**
- * Renderable wrapper for drupal_get_js(), drupal_get_css(), drupal_get_head(),
- * etc.
+ * Renderable wrapper for drupal_get_* functions.
+ */
+
+
+/**
+ * A class that wraps drupal_get_* functions so they can be rendered in a template.
+ *
+ * To use, one may pass in the function name as a string followed by an array of
+ * arguments to the contstructor.
+ * @code
+ *  $variables['scripts'] = new RenderableWrapper('drupal_get_js');
+ *  {{ scripts }};
+ *  // Produces
+ *  <script src="http://domain.com/core/misc/script/script.min.js?v=2.6.2"></script>
+ * @endcode
+ *
  */
 class RenderableWrapper {
+
+  /**
+   * Stores the callback function to be called when rendered.
+   *
+   * @var array
+   */
   public $callback = NULL;
+
+  /**
+   * Stores the callback's arguments.
+   *
+   * @var array
+   */
   public $args = array();
 
   /**
@@ -41,9 +67,6 @@ public function __toString() {
   /**
    * Call the callback function.
    *
-   * Does this make exceptions not work... change to render() and let twig
-   * call that.
-   *
    * @return string the results of the drupal_get_* functions.
    */
   public function render() {