chore: checkpoint before Python removal

vendor/async-stream/examples/tcp_accept.rs

@@ -0,0 +1,21 @@
+use async_stream::stream;
+use futures_util::pin_mut;
+use futures_util::stream::StreamExt;
+use tokio::net::TcpListener;
+
+#[tokio::main]
+async fn main() {
+    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
+
+    let incoming = stream! {
+        loop {
+            let (socket, _) = listener.accept().await.unwrap();
+            yield socket;
+        }
+    };
+    pin_mut!(incoming);
+
+    while let Some(v) = incoming.next().await {
+        println!("handle = {:?}", v);
+    }
+}