functor (M : sig end) ->
sig
val check_invariant : bool Pervasives.ref
val show_messages : bool Pervasives.ref
val debug :
't Invariant.t ->
module_name:string ->
string ->
't list ->
'args ->
('args -> Sexplib.Sexp.t) ->
('result -> Sexplib.Sexp.t) -> (unit -> 'result) -> 'result
end