message: MAINT: Avoid unused method warning
diff: @@ -734,6 +734,8 @@ impl<N, E, Ty, Ix> StableGraph<N, E, Ty, Ix>
  self.g.raw_nodes()
  }
  + // used by check_free_lists conditionally
  + #[allow(unused)]
  fn raw_edges(&self) -> &[Edge<Option<E>, Ix>] {
  self.g.raw_edges()
  }
  