Problems with lookups in new versions 1.6.7+

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1 
Currently with the new ansible versions 1.6.7+ I have problems in some of my playbooks

I get this error:
A variable inserted a new parameter into the module args. Be sure to quote variables if they contain equal signs (for example: "{{var}}").

Using a playbook as simple as this one:

- hosts: all
  vars:
     contents: "{{ lookup('file', '/tmp/foo.txt') }}"

  tasks:

     - shell: echo "the value of foo.txt is {{ contents }}"

Is there any solution for that kind of playbooks?

Thanks.
2

Please let us know if this occurs with 1.6.10, previously there was an issue when a file contained an equals sign that should now be resolved.