DOCUMENTATION:
  name: unreachable
  author: Ansible Core
  version_added: "1.9"
  short_description: Did task end due to the host was unreachable
  description:
    - Tests if task was not able to reach the host for execution
    - This test checks for the existance of a C(unreachable) key in the input dictionary and that it's value is C(True)
  options:
    _input:
      description: registered result from an Ansible task
      type: dictionary
      required: True
EXAMPLES: |
  # test 'status' to know how to respond
  {{ (taskresults is unreachable }}

RETURN:
  _value:
    description: Returns C(True) if the task flagged the host as unreachable, C(False) otherwise.
    type: boolean