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The first available version (v2_6_3) is shown here.
down(graph)
public
# File lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular.rb, line 25
def down(graph)
edge = make_edge(graph)
delete_first(edge.origin.outgoing_edges, edge)
delete_first(edge.destination.incoming_edges, edge)
end