module type S = sig .. end
module Id: Identifiable.S 
type Id.Set.t Id.Map.t 
If (a -> set) belongs to the map, it means that there are edges
      from a to every element of set.  It is assumed that no edge
      points to a vertex not represented in the map.
type 
| | | Has_loop of Id.t list | 
| | | No_loop of Id.t | 
val connected_components_sorted_from_roots_to_leaf : directed_graph ->
       component array
val component_graph : directed_graph ->
       (component * int list) array
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