let choices_fill () : unit Deferred.t =
(*
let i = Ivar.create () in
don't_wait_for (Deferred.all_unit [
(after (sec 2.) >>| fun () -> Ivar.fill i "haskell");
(after (sec 1.) >>| fun () -> Ivar.fill i "ocaml");
]);
Ivar.read i >>= fun s ->
print_endline s;
*)
return ()