use async_tungstenite::tungstenite::Message as WebSocketMessage;use futures::{SinkExt as _, StreamExt as _}; pub struct Connection {    pub(crate) tx:        Box<dyn 'static + Send + Unpin + futures::Sink<WebSocketMessage, Error = anyhow::Error>>,    pub(crate) rx: Box<        dyn 'static            + Send            + Unpin            + futures::Stream<Item = Result<WebSocketMessage, anyhow::Error>>,    >,} impl Connection {    pub fn new<S>(stream: S) -> Self    where        S: 'static            + Send            + Unpin            + futures::Sink<WebSocketMessage, Error = anyhow::Error>            + futures::Stream<Item = Result<WebSocketMessage, anyhow::Error>>,    {        let (tx, rx) = stream.split();        Self {            tx: Box::new(tx),            rx: Box::new(rx),        }    }     pub async fn send(&mut self, message: WebSocketMessage) -> Result<(), anyhow::Error> {        self.tx.send(message).await    }     #[cfg(any(test, feature = "test-support"))]    pub fn in_memory(        executor: gpui::BackgroundExecutor,    ) -> (Self, Self, std::sync::Arc<std::sync::atomic::AtomicBool>) {        use std::sync::{            atomic::{AtomicBool, Ordering::SeqCst},            Arc,        };         let killed = Arc::new(AtomicBool::new(false));        let (a_tx, a_rx) = channel(killed.clone(), executor.clone());        let (b_tx, b_rx) = channel(killed.clone(), executor);        return (            Self { tx: a_tx, rx: b_rx },            Self { tx: b_tx, rx: a_rx },            killed,        );         #[allow(clippy::type_complexity)]        fn channel(            killed: Arc<AtomicBool>,            executor: gpui::BackgroundExecutor,        ) -> (            Box<dyn Send + Unpin + futures::Sink<WebSocketMessage, Error = anyhow::Error>>,            Box<dyn Send + Unpin + futures::Stream<Item = Result<WebSocketMessage, anyhow::Error>>>,        ) {            use anyhow::anyhow;            use futures::channel::mpsc;            use std::io::{Error, ErrorKind};             let (tx, rx) = mpsc::unbounded::<WebSocketMessage>();             let tx = tx.sink_map_err(|error| anyhow!(error)).with({                let killed = killed.clone();                let executor = executor.clone();                move |msg| {                    let killed = killed.clone();                    let executor = executor.clone();                    Box::pin(async move {                        executor.simulate_random_delay().await;                         // Writes to a half-open TCP connection will error.                        if killed.load(SeqCst) {                            std::io::Result::Err(Error::new(ErrorKind::Other, "connection lost"))?;                        }                         Ok(msg)                    })                }            });             let rx = rx.then({                let executor = executor.clone();                move |msg| {                    let killed = killed.clone();                    let executor = executor.clone();                    Box::pin(async move {                        executor.simulate_random_delay().await;                         // Reads from a half-open TCP connection will hang.                        if killed.load(SeqCst) {                            futures::future::pending::<()>().await;                        }                         Ok(msg)                    })                }            });             (Box::new(tx), Box::new(rx))        }    }}