and +'a node = 'a Seq.node = | Nil| Cons of 'a * 'a t
val cons : 'a -> 'a t -> 'a tval append : 'a t -> 'a t -> 'a tval map : 'a t -> f:('a -> 'b) -> 'b tval filter : 'a t -> f:('a -> bool) -> 'a tval filter_map : 'a t -> f:('a -> 'b option) -> 'b tval fold_left : 'b t -> init:'a -> f:('a -> 'b -> 'a) -> 'aval iter : 'a t -> f:('a -> unit) -> unit