(module loop_sum_to_run
  (fn main
    (doc "loop-recur iter 3 — sum 1..10 via loop/recur. Expected stdout: 55.")
    (type (fn-type (params) (ret (own (con Unit))) (effects IO)))
    (params)
    (body (app print (app sum_to 10))))
  (fn sum_to
    (type (fn-type (params (own (con Int))) (ret (own (con Int)))))
    (params n)
    (body
      (loop (acc (con Int) 0) (i (con Int) 1)
        (if (app gt i n)
            acc
            (recur (app + acc i) (app + i 1)))))))