Fix the uds_datagram tests with the latest nightly stdlib

io::ErrorKind just replaced most uses of "Other" with "Uncategorized"
and prohibits users from matching on "Uncategorized".  So match on the
errno instead.

rust-lang/rust#85746

tokio/tests/uds_datagram.rs

@@ -88,8 +88,14 @@ async fn try_send_recv_never_block() -> io::Result<()> {
 
  match dgram1.try_send(payload) {
  Err(err) => match err.kind() {
- io::ErrorKind::WouldBlock | io::ErrorKind::Other => break,
- _ => unreachable!("unexpected error {:?}", err),
+ io::ErrorKind::WouldBlock => break,
+ _ => {
+ let errno = err.raw_os_error().expect("Not an errno?");
+ if errno == libc::ENOBUFS {
+ break;
+ }
+ unreachable!("unexpected error {:?}", err);
+ }
  },
  Ok(len) => {
  assert_eq!(len, payload.len());
@@ -292,8 +298,14 @@ async fn try_recv_buf_never_block() -> io::Result<()> {
 
  match dgram1.try_send(payload) {
  Err(err) => match err.kind() {
- io::ErrorKind::WouldBlock | io::ErrorKind::Other => break,
- _ => unreachable!("unexpected error {:?}", err),
+ io::ErrorKind::WouldBlock => break,
+ _ => {
+ let errno = err.raw_os_error().expect("Not an errno?");
+ if errno == libc::ENOBUFS {
+ break;
+ }
+ unreachable!("unexpected error {:?}", err);
+ }
  },
  Ok(len) => {
  assert_eq!(len, payload.len());