output

ansible-playbook 2.4.2.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/home/vrutkovs/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /home/vrutkovs/.local/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 2.7.14 (default, Mar 14 2018, 13:36:31) [GCC 7.3.1 20180303 (Red Hat 7.3.1-5)]
Using /etc/ansible/ansible.cfg as config file
Parsed /etc/ansible/hosts inventory source with ini plugin
 [WARNING]: Could not match supplied host pattern, ignoring: all

 [WARNING]: provided hosts list is empty, only localhost is available


PLAYBOOK: test.yaml ***************************************************************************************************************************************************************************
1 plays in test.yaml

PLAY [localhost] ******************************************************************************************************************************************************************************
META: ran handlers

TASK [set_fact] *******************************************************************************************************************************************************************************
task path: /tmp/ansible/test.yaml:5
ok: [localhost] => {
    "ansible_facts": {
        "name": "foo"
    }, 
    "changed": false
}

TASK [add foo] ********************************************************************************************************************************************************************************
task path: /tmp/ansible/test.yaml:7
ok: [localhost] => {
    "name": "foo"
}
META: ran handlers
META: ran handlers

PLAY RECAP ************************************************************************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0   

test.yml

- hosts: localhost
  connection: local
  gather_facts: no
  tasks:
  - set_fact:
      name: foo
  - name: "add {{name}}"
    debug:
      var=name