LiteralIntf.Zedtype char_intf = Zed_char.ttype string_intf = Zed_string.tval empty_string : unit -> string_intfval of_char : Zed_char.t -> char_intfval of_string : Zed_string.t -> string_intfval to_char : char_intf -> Zed_char.t option * Uchar.t listval to_string : string_intf -> Zed_string.t * Uchar.t listval to_char_exn : char_intf -> Zed_char.tval to_string_exn : string_intf -> Zed_string.t