--TEST--
Exception for child templates defining content outside blocks defined by parent
--TEMPLATE--
{% extends 'base.twig' %}

Content outside a block.

{% block sidebar %}
    Content inside a block.
{% endblock %}
--TEMPLATE(base.twig)--
{% block sidebar %}
{% endblock %}
--EXCEPTION--
Twig\Error\SyntaxError: A template that extends another one cannot include content outside Twig blocks. Did you forget to put the content inside a {% block %} tag in "index.twig" at line 3?