(module loop_smoke

  (fn count_to
    (doc "Iter it.1 — single counted loop; counts i up to n and returns n.")
    (type (fn-type (params (con Int)) (ret (con Int))))
    (params n)
    (body
      (loop ((var i (con Int) 0))
        (if (app == i n)
          i
          (recur (app + i 1)))))))