$$ base
{% block body %}Parent {{ name }}{% endblock body %}
$$ child
{% extends "base" %}{% block body %}
bare=[{{ super() }}]
filtered=[{{ super() | upper }}]
{% set parent = super() %}set=[{{ parent }}]
{% set captured_parent %}{{ super() | upper }}{% endset %}captured=[{{ captured_parent }}]
twice=[{{ super() }}|{{ super() }}]
{% endblock body %}