playbook + invocation + output

gistfile1.txt

---
- hosts: infrastructure
  become: true
  pre_tasks:
    - name: debug
      debug:
        msg: "{{ hostvars[item] }}"
      with_items: "{{ groups['infrastructure'] }}"
...
## Invocation:

ansible-playbook -i ~/Workspaces/ansible-inventory/mycloud includes/test.yml

## Output:

PLAY [infrastructure] ***********************************************************************************************************************************************************************************************

TASK [Gathering Facts] **********************************************************************************************************************************************************************************************
ok: [apps-public1]
ok: [bastion]

TASK [debug] ********************************************************************************************************************************************************************************************************
fatal: [apps-public1]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'ansible.vars.hostvars.HostVars object' has no attribute u'apps-public1'\n\nThe error appears to have been in '/home/bki/Workspaces/playbooks/test.yml': line 5, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  pre_tasks:\n    - name: debug\n      ^ here\n"}
fatal: [bastion]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'ansible.vars.hostvars.HostVars object' has no attribute u'apps-public1'\n\nThe error appears to have been in '/home/bki/Workspaces/playbooks/test.yml': line 5, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  pre_tasks:\n    - name: debug\n      ^ here\n"}