`self` variable is not defined

Hi,

The following code triggers an error (), is it normal ? It works fine in jinja :

{% block test %}{% endblock %}
{{ self.test() }}

(self.test() should return the content of the test block, especially useful when you want to wrap contents such as in the following example)

{% if self.test() | trim != "" %}
    <div class="wrapper">
        {% block test %}{% endblock %}
    </div>
{% endif %}