You can search for identifiers within the package.
in-package search v0.2.0
val iter : ('a -> unit) -> 'a option -> unit
val fold : ('a -> 'b -> 'b) -> 'a option -> 'b -> 'b
val map : ('a -> 'b) -> 'a option -> 'b option
val multiply : ('a -> 'a -> 'a) -> 'a option -> 'a option -> 'a option