Django inclusion_tag contents not displaying

I cannot get the contents of an inclusion_tag to display. I am not getting an errors so i know that the tag is registering and I am almost certain that it is loading correctly. The tag is created in crudapp/templatetags/crudapp_tags.py

from django import template
register = template.Library()

@register.inclusion_tag("forum.html")
def results(poll):
    form = 'blah'
    return {'form': form}

templates/forum.html

  {% extends 'index.html' %}
{% load crudapp_tags %}
{% results poll %}
<p>aaa</p>
{% block homepage %}
<p>bbb</p> <!-- Only this displays -->
{% if form %}
<p>Form exists</p>
{% endif %}
{% for item in form %}
<p>This is {{ item }}</p>
{% endfor %}
<div>
  <p>{% if user.is_authenticated %}Add a New Topic: <a href="{% url 'topic_form' %}"><span class="glyphicon glyphicon-plus"></span></a>{% endif %}</p>
</div>
<div>
  <p>{{ totalposts.count }} posts, {{ totaltopics.count }} topics, {{ totalusers.count }} users, {{ totalviews.numviews}} views</p>
</div>
{% endblock %}

The file set up is as follows,

If you are using an inclusion tag, then the tag renders another template. You need to move the code that uses form out of forum.html and into a new template, e.g. results.html

results.html

{% if form %}
<p>Form exists</p>
{% endif %}
{% for item in form %}
<p>This is {{ item }}</p>
{% endfor %}

Then change your tag to use this template

@register.inclusion_tag("results.html")
def results(poll):
    form = 'blah'
    return {'form': form}

Finally, since you are extending a template, you need to move then tag into a block, otherwise the result won't be used.

{% block homepage %}
{% results poll %}
...
{% endblock %}

If you want to add an item to the template context instead of rendering another template, then you want a simple tag instead.

@register.simple_tag
def fetch_result():
    result = ['foo', 'bar']
    return result

Then in your template:

{% fetch_result as result %}

{% for item in result %}
<p>This is {{ item }}</p>
{% endfor %}

The {% fetch_result as result %} works for simple tags in Django 1.9+. In earlier versions, you want an assignment tag.