You can search for identifiers within the package.
in-package search v0.2.0
type ('a, 'l) t = {
r : ('a, 'l) R.t;
feedback : 'l Message.t list;
}
val map : f:('a -> 'b) -> ('a, 'l) t -> ('b, 'l) t
val map_loc : f:('l -> 'm) -> ('a, 'l) t -> ('a, 'm) t