有哪些OCAML库用于惰性列表处理?

提供惰性列表处理的OCAML库有哪些?我在找这些方面的东西:

type 'a lazy_list = (*'*)
  | Nil
  | Cons of 'a * 'a lazy_list lazy_t

let from f = 
  let rec gen n = 
    lazy 
      (
        match f n with 
          | Some x ->
              Cons (x, gen (n + 1))
          | None ->
              Nil
      )
  in 
    gen 0

与集成 Stream 类型和语法糖 回溯 Camlp4解析器会很好。