From 2426ce44af403fde87d4989d2824c0f8d8e11bdf Mon Sep 17 00:00:00 2001
From: Oskar Stark <oskarstark@googlemail.com>
Date: Sat, 11 Mar 2023 14:25:14 +0100
Subject: [PATCH] Be consistent in code examples

---
 service_container/service_closures.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/service_container/service_closures.rst b/service_container/service_closures.rst
index d490bcb3769..1a6b6542680 100644
--- a/service_container/service_closures.rst
+++ b/service_container/service_closures.rst
@@ -58,6 +58,9 @@ argument of type ``service_closure``:
             App\Service\MyService:
                 arguments: [!service_closure '@mailer']
 
+                # In case the dependency is optional
+                # arguments: [!service_closure '@?mailer']
+
     .. code-block:: xml
 
         <!-- config/services.xml -->
@@ -69,6 +72,11 @@ argument of type ``service_closure``:
             <services>
                 <service id="App\Service\MyService">
                     <argument type="service_closure" id="mailer"/>
+
+                    <!--
+                    In case the dependency is optional
+                    <argument type="service_closure" id="mailer" on-invalid="ignore"/>
+                    -->
                 </service>
             </services>
         </container>