set_fact/include/role vars precedence

Hi,

I’m confused with variable precedence of Ansible 2.0 documented in http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable . Suppose I have playbooks and roles as follows:

hosts (inventory):

`

[default]
localhost x=1

`

roles/a/tasks/main.yml (task in role a):

`