Fix Parser context push on stack

lib/Twig/Parser.php

@@ -63,7 +63,12 @@ class Twig_Parser implements Twig_ParserInterface
     public function parse(Twig_TokenStream $stream, $test = null, $dropNeedle = false)
     {
         // push all variables into the stack to keep the current state of the parser
-        $vars = get_object_vars($this);
+        // using get_object_vars() instead of foreach would lead to https://bugs.php.net/71336
+        $vars = array();
+        foreach ($this as $k => $v) {
+            $vars[$k] = $v;
+        }
+
         unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser'], $vars['reservedMacroNames']);
         $this->stack[] = $vars;
 

test/Twig/Tests/Fixtures/tags/embed/with_extends.test

@@ -17,6 +17,7 @@
             block1extended
         {% endblock %}
     {% endembed %}
+    {{ parent() }}
 {% endblock %}
 --TEMPLATE(base.twig)--
 A
@@ -54,4 +55,6 @@ A
             block1extended
         B
     block2
-CB
+C        blockc2base
+
+B