You can search for identifiers within the package.
in-package search v0.2.0
val map : f:('a -> 'b) -> 'a option -> 'b option
val apply : f:('a -> 'b option) -> 'a option -> 'b option
val iter : f:('a -> unit) -> 'a option -> unit
val unopt : default:'a -> 'a option -> 'a
val unopt_map : f:('a -> 'b) -> default:'b -> 'a option -> 'b
val first_some : 'a option -> 'a option -> 'a option
val try_with : (unit -> 'a) -> 'a option
val some : 'a -> 'a option