==================
Simple Reduce Loop
==================

reduce i to acc in [1, 2, 3] {
  acc += i
}

---

(root
  (block
    (statement
      (reduce
        (identifier)
        (identifier)
        (expression
          (value
            (list
              (expression
                (value
                  (integer)))
              (expression
                (value
                  (integer)))
              (expression
                (value
                  (integer))))))
        (block
          (statement
            (assignment
              (identifier)
              (assignment_operator)
              (statement
                (expression
                  (identifier))))))))))

==================
Nested Reduce Loop
==================

reduce i to acc in ["one", "two", "three"] {
  acc += i
}

---

(root
  (block
    (statement
      (reduce
        (identifier)
        (identifier)
        (expression
          (value
            (list
              (expression
                (value
                  (string)))
              (expression
                (value
                  (string)))
              (expression
                (value
                  (string))))))
        (block
          (statement
            (assignment
              (identifier)
              (assignment_operator)
              (statement
                (expression
                  (identifier))))))))))