core/lib/Drupal/Core/Template/ThemeRegistryNodeVisitor.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/lib/Drupal/Core/Template/ThemeRegistryNodeVisitor.php b/core/lib/Drupal/Core/Template/ThemeRegistryNodeVisitor.php
index 5d8ecab..f7c9204 100644
--- a/core/lib/Drupal/Core/Template/ThemeRegistryNodeVisitor.php
+++ b/core/lib/Drupal/Core/Template/ThemeRegistryNodeVisitor.php
@@ -70,6 +70,7 @@ protected function doEnterNode(\Twig_Node $node, \Twig_Environment $env) {
           throw new \Twig_Error(sprintf('Template "%s" extends "%s", but no such parent templates exist.', $node->getAttribute('filename'), $parent->getAttribute('value')));
         }
         $node->setNode('parent', $this->getReplacementNode($parent, $candidates));
+        debug((string) $node->getNode('parent'));
       }
     }
     elseif ($node instanceof \Twig_Node_Include) {
@@ -80,6 +81,7 @@ protected function doEnterNode(\Twig_Node $node, \Twig_Environment $env) {
           throw new \Twig_Error(sprintf('Template "%s" includes "%s", but no such templates exist.', $node->getAttribute('filename'), $include->getAttribute('value')));
         }
         $node->setNode('expr', $this->getReplacementNode($include, $candidates));
+        debug((string) $node->getNode('expr'));
       }
     }
     return $node;