You can search for identifiers within the package.
in-package search v0.2.0
type 'a t
val empty : 'a t
val singleton : 'a -> 'a t
val union : 'a t -> 'a t -> 'a t
val mem : 'a -> 'a t -> bool
val rem : 'a -> 'a t -> 'a t
val add : 'a -> 'a t -> 'a t
val map : ('a -> 'b) -> 'a t -> 'b t
val iter : ('a -> unit) -> 'a t -> unit
val fold : ('a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val print : 'a formatter -> 'a t formatter