From 1f96545e6dd42f3b08d57c496ede7695d2da8b7d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20T=27JAMPENS?= <remi.tjampens@gmail.com>
Date: Thu, 5 Jul 2018 20:48:42 +0200
Subject: [PATCH 1/3] Add missing RuntimeExtensionInterface

If the Twig runtime class does not implement RuntimeExtensionInterface, the autoconfigure feature of the container will not tag it with `twig.runtime`, and an exception will be thrown ("Unable to load the "App\Twig\AppRuntime" runtime.")
---
 templating/twig_extension.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/templating/twig_extension.rst b/templating/twig_extension.rst
index 3a08ec059d7..2f656f104c5 100644
--- a/templating/twig_extension.rst
+++ b/templating/twig_extension.rst
@@ -117,8 +117,10 @@ previous ``priceFilter()`` method::
 
     // src/Twig/AppRuntime.php
     namespace App\Twig;
+    
+    use use Twig\Extension\RuntimeExtensionInterface;
 
-    class AppRuntime
+    class AppRuntime implements RuntimeExtensionInterface
     {
         public function __construct()
         {

From 60660c8e6691b22ee060c6b98ae2413d40ffcbf1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20T=27JAMPENS?= <remi.tjampens@gmail.com>
Date: Thu, 5 Jul 2018 21:15:02 +0200
Subject: [PATCH 2/3] Remove duplicate `use` keyword

---
 templating/twig_extension.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/templating/twig_extension.rst b/templating/twig_extension.rst
index 2f656f104c5..39189f59ccc 100644
--- a/templating/twig_extension.rst
+++ b/templating/twig_extension.rst
@@ -118,7 +118,7 @@ previous ``priceFilter()`` method::
     // src/Twig/AppRuntime.php
     namespace App\Twig;
     
-    use use Twig\Extension\RuntimeExtensionInterface;
+    use Twig\Extension\RuntimeExtensionInterface;
 
     class AppRuntime implements RuntimeExtensionInterface
     {

From 709970bb471798201c3fedab68ea776d91ab77a9 Mon Sep 17 00:00:00 2001
From: Javier Eguiluz <javier.eguiluz@gmail.com>
Date: Fri, 6 Jul 2018 09:26:13 +0200
Subject: [PATCH 3/3] Added the missing versionadded directive

---
 templating/twig_extension.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/templating/twig_extension.rst b/templating/twig_extension.rst
index 39189f59ccc..bc84e6ae6e2 100644
--- a/templating/twig_extension.rst
+++ b/templating/twig_extension.rst
@@ -137,6 +137,9 @@ previous ``priceFilter()`` method::
         }
     }
 
+ .. versionadded:: 3.4
+     The ``RuntimeExtensionInterface`` was introduced in Symfony 3.4.
+
 If you're using the default ``services.yaml`` configuration, this will already
 work! Otherwise, :ref:`create a service <service-container-creating-service>`
 for this class and :doc:`tag your service </service_container/tags>` with ``twig.runtime``.