You can search for identifiers within the package.
in-package search v0.2.0
type t = Mirage_crypto.Hash.hash
val hs : ([> `MD5 | `SHA1 | `SHA224 | `SHA256 | `SHA384 | `SHA512 ] * string) list
val sexp_of_t : [> `MD5 | `SHA1 | `SHA224 | `SHA256 | `SHA384 | `SHA512 ] -> Sexplib.Sexp.t
val inv_hs : (string * [> `MD5 | `SHA1 | `SHA224 | `SHA256 | `SHA384 | `SHA512 ]) list
val t_of_sexp : Sexplib.Sexp.t -> [> `MD5 | `SHA1 | `SHA224 | `SHA256 | `SHA384 | `SHA512 ]