impl<'iter, 'graph, G: WithSuccessors> GraphSuccessors<'iter> for &'graph Gtype Item = G::Nodetype Iter = <G as GraphSuccessors<'iter>>::Iterimpl<'graph, N: Idx> GraphSuccessors<'graph> for VecGraph<N>impl<'graph, N: Idx, S: Idx> GraphSuccessors<'graph> for Sccs<N, S>