gistfile1.twig

{% extends 'MyBundle::layout.html.twig' %}

{% form_theme edit_form _self %}

{% set someVariable = 'abc' %}

{% block _myformname_myfield_widget %}
    {{ block('form_widget') }}
    {{ someVariable }}
{% endblock %}


{% block content %}
    <form>
        {{ form_widget(edit_form) }}

        <p><button type="submit">Save</button></p>
    </form>
{% endblock %}