You can search for identifiers within the package.
in-package search v0.2.0
val fold : f:('acc -> 'a -> ('acc, 'err) result) -> init:'acc -> 'a list -> ('acc, 'err) result
val map : f:('a -> ('b, 'err) result) -> 'a list -> ('b list, 'err) result
val split : ('a, 'err) result list -> 'a list * 'err list