Common.Stringval one : char -> tval find : (char -> bool) -> int -> t -> intval has : (char -> bool) -> int -> t -> boolval find_bwd : (char -> bool) -> int -> t -> intval list : t -> char listval of_list : char list -> tval length : t -> intval get : t -> int -> charval make : int -> char -> tval init : int -> (int -> char) -> t