package topological_sort

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topological_sort
- Topological_sort
  - Edge
  - Node

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module type Node = sig ... end

module Edge : sig ... end

val sort : 
  ?verbose:Base.Bool.t ->
  (module Node with type t = 'node) ->
  'node Base.List.t ->
  'node Edge.t Base.List.t ->
  'node Base.List.t Base.Or_error.t

sort (module Node) nodes edges returns a list of nodes output satisfying:

every node that appears in nodes or edges occurs once in output.
if { from; to_ } is in edges, then from occurs before to_ in output.
nodes that have no incoming or outgoing edges appear sorted at the end of output.

sort returns Error if there is a cycle.