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

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

--------------------------------------------------------------------------------

(root
  (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
  (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)))))))))