==================
Firstof Basic
==================

{% firstof var1 var2 "default" %}

---

(template
  (content)
  (firstof
    (filtered_value
      (value
        (variable_attribute
          (identifier))))
    (filtered_value
      (value
        (variable_attribute
          (identifier))))
    (filtered_value
      (value
        (literal
          (string)))))
  (content))

==================
Firstof With As
==================

{% firstof var1 var2 as result %}

---

(template
  (content)
  (firstof
    (filtered_value
      (value
        (variable_attribute
          (identifier))))
    (filtered_value
      (value
        (variable_attribute
          (identifier))))
    (identifier))
  (content))