kekrozsak/vendor/kriswallsmith/assetic/tests/Assetic/Test/Extension/Twig/templates/combine.twig

<assets>
{% stylesheets 'foo.css' 'bar.css' filter='?foo,bar' output='css/packed.css' debug=true combine=true %}<asset url="{{ asset_url }}" />{% endstylesheets %}
</assets>