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The first available version (v2_6_3) is shown here.
up(graph)
public
# File lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/delete_edge.rb, line 17
def up(graph)
edge = make_edge(graph)
edge.origin.outgoing_edges.delete(edge)
edge.destination.incoming_edges.delete(edge)
end