message: remove not needed line
diff: @@ -832,7 +832,6 @@ where
  let mut did_update = false;
  for i in g.node_identifiers() {
  for edge in g.edges(i) {
  - let i = edge.source();
  let j = edge.target();
  let w = *edge.weight();
  if distance[ix(i)] + w < distance[ix(j)] {
  