commit ef99a7a19713c371f01124dc04061a5ad52512a8
Author: Joel Pittet <joel@pittet.ca>
Date:   Tue Sep 2 17:40:43 2014 -0700

    drupal_render

diff --git a/core/modules/system/src/Tests/Common/RenderElementTypesTest.php b/core/modules/system/src/Tests/Common/RenderElementTypesTest.php
index 7391b48..6d83838 100644
--- a/core/modules/system/src/Tests/Common/RenderElementTypesTest.php
+++ b/core/modules/system/src/Tests/Common/RenderElementTypesTest.php
@@ -178,7 +178,7 @@ function testMoreLink() {
     );
 
     foreach($elements as $element) {
-      $xml = new \SimpleXMLElement(render($element['value']));
+      $xml = new \SimpleXMLElement(drupal_render($element['value']));
       $result = $xml->xpath($element['expected']);
       $this->assertTrue($result, '"' . $element['name'] . '" input rendered correctly by drupal_render().');
     }