Deprecate private for include_role (#39821)

lib/ansible/modules/utilities/logic/include_role.py

@@ -49,8 +49,8 @@ options:
     default: 'yes'
   private:
     description:
-      - If C(yes) the variables from C(defaults/) and C(vars/) in a role will not be made available to the rest of the
-        play.
+      - This option is a no op, and the functionality described in previous versions was not implemented. This
+        option will be removed in Ansible v2.8.
     type: bool
     default: 'no'
 notes:

lib/ansible/playbook/role_include.py

@@ -118,6 +118,12 @@ class IncludeRole(TaskInclude):
         if ir._role_name is None:
             raise AnsibleParserError("'name' is a required field for %s." % ir.action, obj=data)
 
+        if ir.private is not None:
+            display.deprecated(
+                msg='Supplying "private" for "include_role" is a no op, and is deprecated',
+                version='2.8'
+            )
+
         # validate bad args, otherwise we silently ignore
         bad_opts = my_arg_names.difference(IncludeRole.VALID_ARGS)
         if bad_opts: