I have a static inventory setup with the hope of applying different roles 
to different hosts, but am finding that this playbook is not achieving what 
I would like:

- hosts: "{{target}}"
  pre_tasks:
    - debug: var=role
  roles:
    - "{{role}}"
  tasks:
    - debug: var=role
  post_tasks:
    - debug: var=role


Ultimately with an inventory of:

192.168.1.13 role=test


Executing this playbook:

ansible-playbook -i inventory testrole.yml -e "target=192.168.1.13"
ERROR! 'role' is undefined


This persists no matter where I attempt to define that role variable, in 
inventory, group_vars, host_vars, etc.  If I comment out the roles stanza, 
all the debug tasks report the variable being interpolated correctly no 
matter how I do it.  The only way I have found the role to be variable so 
far is to define it with --extra-args at the command line.

I this a bug, or am I running into a hard boundary of ansible?

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