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twig inherit content in blocks

With Symfony & Twig, when you inherit a block you cannot put some texts outside the defined block.

Let the "base.html.twig" (the one default in Symfony:

 <!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <title>{% block title %}Welcome!{% endblock %}</title>
        {% block stylesheets %}{% endblock %}
        <link rel="icon" type="image/x-icon" href="{{ asset('favicon.ico') }}" />
    </head>
    <body>
        {% block body %}{% endblock %}
        {% block javascripts %}{% endblock %}
    </body>
</html>

When you inherit this template, you can just fill the blocks sections.

This will work:

 {% extends "::base.html.twig" %}
{% block body %}
  Hello {{ name }}!
{% endblock %}

This wont work:

 {% extends "::base.html.twig" %}
Extra text throwing error.
{% block body %}
  Hello {{ name }}!
{% endblock %}

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