You can search for identifiers within the package.
in-package search v0.2.0
type 'a t
type info
type iexn = exn * info
val make : unit -> 'a t
val null : info
val add : info -> 'a t -> 'a -> info
val get : info -> 'a t -> 'a option
val info : exn -> info
val iraise : iexn -> 'a
val raise : ?info:info -> exn -> 'a