`sig
type ('a, 'm) fg
type ('wrapped_type, 'a, 'm) wrap =
monoid:'m monoid -> measure:('a -> 'm) -> 'wrapped_type
val empty : ('a, 'm) fg
val singleton : 'a -> ('a, 'm) fg
val cons : (('a, 'm) fg -> 'a -> ('a, 'm) fg, 'a, 'm) wrap
val snoc : (('a, 'm) fg -> 'a -> ('a, 'm) fg, 'a, 'm) wrap
val front : (('a, 'm) fg -> (('a, 'm) fg * 'a) option, 'a, 'm) wrap
val front_exn : (('a, 'm) fg -> ('a, 'm) fg * 'a, 'a, 'm) wrap
val head : ('a, 'm) fg -> 'a option
val head_exn : ('a, 'm) fg -> 'a
val last : ('a, 'm) fg -> 'a option
val last_exn : ('a, 'm) fg -> 'a
val tail : (('a, 'm) fg -> ('a, 'm) fg option, 'a, 'm) wrap
val tail_exn : (('a, 'm) fg -> ('a, 'm) fg, 'a, 'm) wrap
val init : (('a, 'm) fg -> ('a, 'm) fg option, 'a, 'm) wrap
val init_exn : (('a, 'm) fg -> ('a, 'm) fg, 'a, 'm) wrap
val rear : (('a, 'm) fg -> (('a, 'm) fg * 'a) option, 'a, 'm) wrap
val rear_exn : (('a, 'm) fg -> ('a, 'm) fg * 'a, 'a, 'm) wrap
val size : ('a, 'm) fg -> int
val is_empty : ('a, 'm) fg -> bool
val fold_left : ('acc -> 'a -> 'acc) -> 'acc -> ('a, 'm) fg -> 'acc
val fold_right : ('acc -> 'a -> 'acc) -> 'acc -> ('a, 'm) fg -> 'acc
val iter : ('a -> unit) -> ('a, 'm) fg -> unit
val iter_right : ('a -> unit) -> ('a, 'm) fg -> unit
val compare : ('a -> 'a -> int) -> ('a, 'm) fg -> ('a, 'm) fg -> int
val equal : ('a -> 'a -> bool) -> ('a, 'm) fg -> ('a, 'm) fg -> bool
val enum : ('a, 'm) fg -> 'a BatEnum.t
val backwards : ('a, 'm) fg -> 'a BatEnum.t
val to_list : ('a, 'm) fg -> 'a list
val to_list_backwards : ('a, 'm) fg -> 'a list
val of_enum : ('a BatEnum.t -> ('a, 'm) fg, 'a, 'm) wrap
val of_backwards : ('a BatEnum.t -> ('a, 'm) fg, 'a, 'm) wrap
val of_list : ('a list -> ('a, 'm) fg, 'a, 'm) wrap
val of_list_backwards : ('a list -> ('a, 'm) fg, 'a, 'm) wrap
val map : (('a -> 'b) -> ('a, 'm) fg -> ('b, 'm) fg, 'b, 'm) wrap
val map_right : (('a -> 'b) -> ('a, 'm) fg -> ('b, 'm) fg, 'b, 'm) wrap
val append : (('a, 'm) fg -> ('a, 'm) fg -> ('a, 'm) fg, 'a, 'm) wrap
val reverse : (('a, 'm) fg -> ('a, 'm) fg, 'a, 'm) wrap
val print :
?first:string ->
?last:string ->
?sep:string -> ('a, 'b) BatIO.printer -> (('a, 'c) fg, 'b) BatIO.printer
val lookup : (('m -> bool) -> ('a, 'm) fg -> 'a, 'a, 'm) wrap
val measure : (('a, 'm) fg -> 'm, 'a, 'm) wrap
val split :
(('m -> bool) -> ('a, 'm) fg -> ('a, 'm) fg * ('a, 'm) fg, 'a, 'm) wrap
end`