==================
attribute with literal
==================

foo = "bar"

---

(config_file
  (body
    (attribute
      (identifier)
      (expression (expr_term (template_expr (quoted_template)))))))

==================
attribute with variable
==================

foo = bar

---

(config_file
  (body
    (attribute
      (identifier)
      (expression (expr_term (variable_expr (identifier)))))))