fixed using a Twig_TemplateWrapper instance as an argument to extends

CHANGELOG

@@ -1,5 +1,6 @@
 * 1.37.0 (2019-XX-XX)
 
+ * fixed using a Twig_TemplateWrapper instance as an argument to extends
  * switched generated code to use the PHP short array notation
  * dropped PHP 5.3 support
  * fixed float representation in compiled templates

lib/Twig/Template.php

@@ -108,7 +108,7 @@ abstract class Twig_Template implements Twig_TemplateInterface
      *
      * @param array $context
      *
-     * @return Twig_TemplateInterface|false The parent template or false if there is no parent
+     * @return Twig_TemplateInterface|Twig_TemplateWrapper|false The parent template or false if there is no parent
      *
      * @internal
      */
@@ -125,8 +125,8 @@ abstract class Twig_Template implements Twig_TemplateInterface
                 return false;
             }
 
-            if ($parent instanceof self) {
-                return $this->parents[$parent->getTemplateName()] = $parent;
+            if ($parent instanceof self || $parent instanceof Twig_TemplateWrapper) {
+                return $this->parents[$parent->getSourceContext()->getName()] = $parent;
             }
 
             if (!isset($this->parents[$parent])) {
@@ -355,11 +355,7 @@ abstract class Twig_Template implements Twig_TemplateInterface
                 return $this->env->resolveTemplate($template);
             }
 
-            if ($template instanceof self) {
-                return $template;
-            }
-
-            if ($template instanceof Twig_TemplateWrapper) {
+            if ($template instanceof self || $template instanceof Twig_TemplateWrapper) {
                 return $template;
             }
 

lib/Twig/TemplateWrapper.php

@@ -40,7 +40,9 @@ final class Twig_TemplateWrapper
      */
     public function render($context = [])
     {
-        return $this->template->render($context);
+        // using func_get_args() allows to not expose the blocks argument
+        // as it should only be used by internal code
+        return $this->template->render($context, func_num_args() >= 1 ? func_get_arg(1) : []);
     }
 
     /**
@@ -50,7 +52,9 @@ final class Twig_TemplateWrapper
      */
     public function display($context = [])
     {
-        $this->template->display($context);
+        // using func_get_args() allows to not expose the blocks argument
+        // as it should only be used by internal code
+        $this->template->display($context, func_num_args() >= 1 ? func_get_arg(1) : []);
     }
 
     /**

test/Twig/Tests/Fixtures/tags/inheritance/parent_as_template_wrapper.test

@@ -0,0 +1,12 @@
+--TEST--
+"extends" tag with a parent as a Twig_TemplateWrapper instance
+--TEMPLATE--
+{% extends foo %}
+
+{% block content %}New{% endblock %}
+--TEMPLATE(foo.twig)--
+{% block content %}Default{% endblock %}
+--DATA--
+return ['foo' => $twig->load('foo.twig')]
+--EXPECT--
+New