Links with non-local parameters broken

[vasilisp]

Consider the following setup:

let my_nl_params =
  Eliom_parameter.make_non_localized_parameters
    ~prefix:"prefix"
    ~name:"name"
    Eliom_parameter.(int "a")

let main_service =
  Eliom_service.create
    ~path:(Eliom_service.Path [])
    ~meth:(Eliom_service.Get Eliom_parameter.unit)
    ()              


(* ... *)

a ~service:main_service
  ~nl_params:(
    Eliom_parameter.add_nl_parameter
      Eliom_parameter.empty_nl_params_set
      my_nl_params
      0)
  [pcdata "with local params"]
  ()

Clicking on the link produces a TypeError of yet-undetermined origin. To be investigated.