val map : ('a -> 'b t) -> 'a list -> 'b list tval map_right : ('a -> 'b t) -> 'a list -> 'b list tval fold_right : ('a -> 'b -> 'b t) -> 'a list -> 'b -> 'b tval fold_left : ('a -> 'b -> 'a t) -> 'a -> 'b list -> 'a tval iter : ('a -> unit t) -> 'a list -> unit tval map_filter : ('a -> 'b option t) -> 'a list -> 'b list tval fold_left2 : 'a t -> ('a -> 'b -> 'c -> 'a t) -> 'a -> 'b list -> 'c list -> 'a t