You can search for identifiers within the package.
in-package search v0.2.0
type plugin = ..
val provide : plugin -> 'a
type error =
| Dynlink_error of Dynlink.error
| Not_a_linkage_plugin
| Wrong_plugin_type of plugin
val load : string -> (plugin, error) result
exception Error of string * error
val raise_error : (plugin, error) result -> 'a