message: Simplify iterator and subsequent map in `small_network::test`
diff: @@ -155,7 +155,7 @@ impl Network {
  /// Crank all runners once, returning the number of events processed.
  async fn crank_all(&mut self) -> usize {
  - join_all(self.nodes.iter_mut().map(|(_, runner)| runner.try_crank()))
  + join_all(self.nodes.values_mut().map(Runner::try_crank))
  .await
  .into_iter()
  .filter(|opt| opt.is_some())
  