message: Remove the impl that duplicates the default logic.
diff: @@ -47,6 +47,7 @@ impl<M: Clone + Debug> TargetedMessage<M> {
  pub(crate) struct ValidatorId(pub(crate) u64);
  /// A validator in the test network.
  +#[derive(Debug)]
  pub(crate) struct Validator<C, M, D>
  where
  M: Clone + Debug,
  @@ -295,11 +296,7 @@ mod virtual_net_tests {
  struct NoOpDelay;
  - impl Strategy<DeliverySchedule> for NoOpDelay {
  - fn map<R: rand::Rng>(&self, _rng: &mut R, i: DeliverySchedule) -> DeliverySchedule {
  - i
  - }
  - }
  + impl Strategy<DeliverySchedule> for NoOpDelay {}
  type M = u64;
  type C = u64;
  