================================================================================
Transform Loop
================================================================================

transform i in [1, 2, 3] {
  (output i)
}

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

(root
  (block
    (statement
      (transform
        (identifier)
        (expression
          (value
            (list
              (expression
                (value
                  (integer)))
              (expression
                (value
                  (integer)))
              (expression
                (value
                  (integer))))))
        (block
          (statement
            (expression
              (function_call
                (built_in_function
                  (expression
                    (identifier)))))))))))

================================================================================
Nested Transform Loop
================================================================================

transform i in [['one'] ['two'] ['three']] {
  transform j in i {
    j += 'foobar'
  }
}

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

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