module type S2 = sig .. end
type 'a out_value
type ('key, 'data) t = private ('key, 'data out_value) Core.Std.Map.Poly.t
type 'a _in_value = 'a
type 'a _out_value = 'a out_value
type ('a, 'b) _t = ('a, 'b) t
val empty : ('a, 'b) t
val singleton : 'a -> 'b -> ('a, 'b) t
val is_empty : ('a, 'b) t -> bool
val length : ('a, 'b) t -> int
val add : key:'a -> data:'b -> ('a, 'b) t -> ('a, 'b) t
val find : ('a, 'b) t -> 'a -> 'b out_value
val remove : ('a, 'b) t -> 'a -> ('a, 'b) t
val set : key:'a ->
data:'b out_value ->
('a, 'b) t -> ('a, 'b) t
val mem : ('a, 'b) t -> 'a -> bool
val iter : ('a, 'b) t ->
f:(key:'a -> data:'b out_value -> unit) -> unit
val fold : ('a, 'b) t ->
init:'c -> f:(key:'a -> data:'b out_value -> 'c -> 'c) -> 'c
val filter : ('a, 'b) t ->
f:(key:'a -> data:'b out_value -> bool) -> ('a, 'b) t
val keys : ('a, 'b) t -> 'a list
val data : ('a, 'b) t -> 'b out_value list
val to_alist : ('a, 'b) t -> ('a * 'b out_value) list
val of_list : ('a * 'b) list -> ('a, 'b) t
val for_all : ('a, 'b) t -> f:('b out_value -> bool) -> bool
val exists : ('a, 'b) t -> f:('b out_value -> bool) -> bool
val to_map : ('a, 'b) t -> ('a, 'b out_value) Core.Std.Map.Poly.t
val of_map : ('a, 'b out_value) Core.Std.Map.Poly.t -> ('a, 'b) t