message: two more instances of dyn FnMut
diff: @@ -107,7 +107,7 @@ impl DataLinkSender for DataLinkSenderImpl {
  fn build_and_send(&mut self,
  num_packets: usize,
  packet_size: usize,
  - func: &mut FnMut(&mut [u8]))
  + func: &mut dyn FnMut(&mut [u8]))
  -> Option<io::Result<()>> {
  for _ in 0..num_packets {
  let mut data = vec![0; packet_size];
  @@ -139,7 +139,7 @@ impl DataLinkSender for InvalidDataLinkSenderImpl {
  fn build_and_send(&mut self,
  _num_packets: usize,
  _packet_size: usize,
  - _func: &mut FnMut(&mut [u8]))
  + _func: &mut dyn FnMut(&mut [u8]))
  -> Option<io::Result<()>> {
  None
  }
  