---
- name: echo a var
  hosts: foobar
  gather_facts: false
  vars_files:
    - foobar-vault.yaml
  vars:
    #sample: "in play scope"
  tasks:
    - name: task1
      debug:
        var: sample
      vars:
        sample: "in task level"
      register: reg_out
        
    - name: task2
      debug:
        var: reg_out
      when: steptwo is defined