Rollup merge of #44647 - tmerr:fix-44645, r=dtolnay

Ensure tcp test case passes when disconnected from network net::tcp::tests::connect_timeout_unroutable fails when the network is unreachable, like on a laptop disconnected from wifi. Check for this error and allow the test to pass. Closes #44645

Author: TimNN

src/libstd/net/tcp.rs

@@ -1570,10 +1570,13 @@ mod tests {
 
  #[test]
  fn connect_timeout_unroutable() {
- // this IP is unroutable, so connections should always time out.
+ // this IP is unroutable, so connections should always time out,
+ // provided the network is reachable to begin with.
  let addr = "10.255.255.1:80".parse().unwrap();
  let e = TcpStream::connect_timeout(&addr, Duration::from_millis(250)).unwrap_err();
- assert_eq!(e.kind(), io::ErrorKind::TimedOut);
+ assert!(e.kind() == io::ErrorKind::TimedOut ||
+ e.kind() == io::ErrorKind::Other,
+ "bad error: {} {:?}", e, e.kind());
  }
 
  #[test]