Ansible Jinja variable issues

group_vars_all.yml

---

simple_var: "Simple var"
nested_var: "{{ simple_var }}"
fact_var: "{{ ansible_default_ipv4.address }}"

hosts

[keystone]
192.168.0.123 ansible_ssh_user=root

roles_keystone_defaults_main.yml

fact_var: "{{ ansible_default_ipv4.address }}"

roles_keystone_tasks_main.yml

---

- name: test template
  template: src=template.j2 dest=/tmp/template.txt

- name: test simple var
  debug: var=simple_var

- name: test nested var
  debug: var=nested_var

- name: test fact var
  debug: var=fact_var

roles_keystone_templates_template.j2

{{ simple_var }}
{{ nested_var }}
{{ fact_var }}

Var extraction:

{% for h in groups['keystone'] %}
 {% set myvars=hostvars[h] %}
  {{ myvars.simple_var }}
  {{ myvars.nested_var }}
  {{ myvars.fact_var }}
  {{ myvars.ansible_default_ipv4.address }}
{% endfor %}

site.yml

---

- hosts: keystone
  roles:
  - role: keystone