Parameter Make.XMap

type key
type 'a t
val empty : 'a t
val is_empty : 'a t -> bool
val singleton : key -> 'a -> 'a t
val find_opt : key -> 'a t -> 'a option
val mapi : (key -> 'a -> 'a) -> 'a t -> 'a t
val union : (key -> 'a -> 'a -> 'a option) -> 'a t -> 'a t -> 'a t
val merge : (key -> 'a option -> 'b option -> 'c option) -> 'a t -> 'b t -> 'c t
val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val for_all : (key -> 'a -> bool) -> 'a t -> bool
val iter : (key -> 'a -> unit) -> 'a t -> unit
val pp : (Stdlib.Format.formatter -> 'a -> unit) -> Stdlib.Format.formatter -> 'a t -> unit