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(* TEST
*)
(* PR#9494 *)
(* Additional test cases from Vincent Laviron: *)
(* Looping version *)
module rec M1 : sig
val f : unit -> unit
val g : unit -> unit
end = struct
let f = M1.g
let g () = M1.f ()
end
(* Alias chain *)
module rec M2 : sig
val f : unit -> unit
val g : unit -> unit
end = struct
let f = M2.g
let g = M2.f
end
(* Original test case from the issue: *)
module rec Id : sig
type t = {id : int}
val compare : t -> t -> int
end = Id (* error here: undefined compare function *)
module IdSet = Set.Make(Id)
let _ = try
let basic_set = IdSet.singleton {id = 0} in
IdSet.mem {id = 1} basic_set (* diverge here *)
with e -> print_endline @@ Printexc.to_string e; false
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