ansible --version
ansible 2.0.0.2

---
- hosts: localhost

  gather_facts: no

  connection: local

  tasks:
    - debug:
        var=item
      with_items: mysql_users

  vars:
    mysql_passwords:
        user: password

    mysql_users:
        - name: user
          password: "{{ mysql_passwords['user'] }}"

        - name: fake
          password: "{{ mysql_passwords['fake'] }}"

ansible-playbook playbook.yml

ansible-playbook playbook.yml

PLAY ***************************************************************************

TASK [debug] *******************************************************************
[DEPRECATION WARNING]: Skipping task due to undefined attribute, in the future this will be a fatal error.. This feature will be removed in a future release. Deprecation warnings can be disabled by setting
deprecation_warnings=False in ansible.cfg.

PLAY RECAP *********************************************************************
localhost                  : ok=0    changed=0    unreachable=0    failed=0