You can search for identifiers within the package.
in-package search v0.2.0
type ('err, 'ok) t
val withDefault : default:'ok -> ('err, 'ok) t -> 'ok
val with_default : default:'ok -> ('err, 'ok) t -> 'ok
val map2 : f:('a -> 'b -> 'c) -> ('err, 'a) t -> ('err, 'b) t -> ('err, 'c) t
val combine : ('x, 'a) t list -> ('x, 'a list) t
val map : ('ok -> 'value) -> ('err, 'ok) t -> ('err, 'value) t
val toOption : ('err, 'ok) t -> 'ok option
val to_option : ('err, 'ok) t -> 'ok option