You can search for identifiers within the package.
in-package search v0.2.0
accessor
Nonempty.Make_access
module T : sig ... end
val access : ('i -> 'a -> 'b, 'it -> 'at -> 'bt, [> Subtyping.nonempty ]) t -> ('i Index.t * 'a, 'b) T.t -> ('it Index.t * 'at, 'bt) T.t