You can search for identifiers within the package.
in-package search v0.2.0
type spec = Arg.key * Arg.spec * Arg.doc
val desc_debug_list : spec
val option_list : unit -> bool
val desc_debug_all : spec
val desc_debug : spec
val desc_shortcut : string -> Arg.key -> Arg.doc -> spec
val set_flags_selected : ?silent:bool -> unit -> unit