core/lib/Drupal/Core/Template/TwigExtension.php | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/core/lib/Drupal/Core/Template/TwigExtension.php b/core/lib/Drupal/Core/Template/TwigExtension.php
index b311347..8c6abcc 100644
--- a/core/lib/Drupal/Core/Template/TwigExtension.php
+++ b/core/lib/Drupal/Core/Template/TwigExtension.php
@@ -466,6 +466,21 @@ public function escapeFilter(\Twig_Environment $env, $arg, $strategy = 'html', $
     return $this->renderer->render($arg);
   }
 
+  /**
+   * Bubbles Twig template argument's cacheability & attachment metadata.
+   *
+   * For example: a generated link or generated URL object is passed as a Twig
+   * template argument, and its bubbleable metadata must be bubbled.
+   *
+   * @see \Drupal\Core\GeneratedLink
+   * @see \Drupal\Core\GeneratedUrl
+   *
+   * @param mixed $arg
+   *   A Twig template argument that is about to be printed.
+   *
+   * @see \Drupal\Core\Theme\ThemeManager::render()
+   * @see \Drupal\Core\Render\RendererInterface::render()
+   */
   protected function bubbleArgMetadata($arg) {
     if ($arg instanceof CacheableDependencyInterface || $arg instanceof AttachmentsInterface) {
       $arg_bubbleable = [];
@@ -478,8 +493,7 @@ protected function bubbleArgMetadata($arg) {
         $arg_bubbleable['#attached'] = $arg->getAttachments();
       }
       if ($arg_bubbleable) {
-        // @todo Inject the Renderer in https://www.drupal.org/node/2529438.
-        drupal_render($arg_bubbleable);
+        $this->renderer->render($arg_bubbleable);
       }
     }
   }