You can search for identifiers within the package.
in-package search v0.2.0
type 'r f = {
f : 'a. 'a -> 'a Asn_core.asn -> 'r -> 'r;
}
val fold_with_value : 'a. 'r f -> 'r -> 'a -> 'a Asn_core.sequence -> 'r