symfony/symfony-docs — pull request #1586 by lyrixx (2012-07-23 14:06:02+00:00)
Title: Fixed typo in cookbook/event_dispatcher/class_extension.rst

- see https://github.com/symfony/symfony/blob/master/src/Symfony/Component/EventDispatcher/EventDispatcher.php#L164

- the second argument of $dispatcher->addListener must be callabled. so I think it is a typo.