message: Log errors on Subscription Drop unsubscription
diff: @@ -721,9 +721,8 @@ impl Subscription {
  impl Drop for Subscription {
  fn drop(&mut self) {
  if self.do_unsub {
  - match self.unsub() {
  - Ok(_) => {}
  - Err(_) => {}
  + if let Err(error) = self.unsub() {
  + eprintln!("error unsubscribing during Subscription Drop: {:?}", error);
  }
  }
  }
  