Parameter Make._

type key = Key.t
type 'a t
val empty : 'a t
val find_opt : key -> 'a t -> 'a option
val update : key -> ('a option -> 'a option) -> 'a t -> 'a t
val for_all : (key -> 'a -> bool) -> 'a t -> bool
val merge : (key -> 'a option -> 'b option -> 'c option) -> 'a t -> 'b t -> 'c t
val to_seq : 'a t -> (key * 'a) Stdlib.Seq.t