functor (S : Monad.TYPEWRAPPER) ->
functor (M : Monad.MONAD) ->
sig
type 'a t
val ( >>= ) : 'a t -> ('a -> 'b t) -> 'b t
val ( >> ) : 'a t -> 'b t -> 'b t
val return : 'a -> 'a t
val run : 'a t -> 'a
val read_state : S.t t
val write_state : S.t -> unit t
val run_with : 'a t -> S.t -> 'a
val lift : 'a M.t -> 'a t
end