message: Print the file that could not be opened
diff: @@ -123,6 +123,7 @@ impl Interop {
  match file.next().await {
  Some(Ok(chunk)) => tx_stream.send(chunk).await?,
  Some(Err(err)) => {
  + eprintln!("error opening {:?}", abs_path);
  tx_stream.reset(1u32.try_into()?)?;
  return Err(err.into());
  }
  