---

- name: Variables defined on tasks are local to those tasks
  gather_facts: no
  hosts: localhost
  vars: 
    check: outter
  tasks:
  - block:
    - debug:
        var: check
    - assert:
        that:
        - check == 'inner'
    vars:
      check: inner
  - debug:
      var: check
  - assert:
      that:
      - check == 'outter'