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

(* OK (t = <m:t>) *)
module rec A : sig type t = <m:B.t> end = struct type t = <m:B.t> end
       and B : sig type t = A.t end = struct type t = A.t end;;