You can search for identifiers within the package.
in-package search v0.2.0
type 'a t =
| Invalid
| Necessary_maybe_stale of 'a option
| Unnecessary_maybe_stale of 'a option
val sexp_of_t : ('a -> Sexplib0.Sexp.t) -> 'a t -> Sexplib0.Sexp.t