(* TEST
flags = " -w a "
ocamlc_byte_exit_status = "2"
* setup-ocamlc.byte-build-env
** ocamlc.byte
*** check-ocamlc.byte-output
*)

(* Bad - PR 4261 *)

module PR_4261 = struct
  module type S =
  sig
    type t
  end

  module type T =
  sig
    module D : S
    type t = D.t
  end

  module rec U : T with type D.t = U'.t = U
  and U' : S with type t = U'.t = U
end;;