I can run a task conditionally, depending on the existence of a file, as 
follows: 

- name: check if the file exists
  stat: path=/my/file
  register: file_register
- name: do the actual task
  include: my_subtask.yml
  when: not file_register.stat.exists

Is it not possible to do smarter things in the when clause? Possible with a 
Jinja2 directive? I tried to search for the documentation of the lookup() 
function I see sometimes, but cannot find it. Is is part of Ansible or of 
Jinja? Is it usable here? 

Thanks in advance,
Eric

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