mistake in guided tour?

[porterjamesj]

when I run this bit of code, utop gives me:

utop #  let is_inside_scene point scene =
     List.exists scene
       ~f:(fun el -> is_inside_scene_element point el)
   ;;
Error: The function applied to this argument has type 'a list -> bool
This argument cannot be applied with label ~f

However if I change the code to:

let is_inside_scene point scene =
     List.exists
       (fun el -> is_inside_scene_element point el)
       scene

everything works fine. This also seems to match the signature given in the List docs. Is this an error in the book?

[porterjamesj]

derp; forgot open Core.Std; sorry for noise.