fix: compilation error, warnings

sqlx-core/src/pool/connect.rs

@@ -1,21 +1,18 @@
 use crate::connection::{ConnectOptions, Connection};
 use crate::database::Database;
-use crate::pool::connection::{Floating, Live};
+use crate::pool::connection::Floating;
 use crate::pool::inner::PoolInner;
 use crate::pool::PoolConnection;
 use crate::rt::JoinHandle;
 use crate::Error;
 use ease_off::EaseOff;
-use event_listener::{Event, EventListener};
+use event_listener::Event;
 use std::fmt::{Display, Formatter};
 use std::future::Future;
-use std::pin::Pin;
 use std::ptr;
 use std::sync::atomic::{AtomicUsize, Ordering};
-use std::sync::{Arc, RwLock};
-use std::task::{Context, Poll};
-use std::time::{Duration, Instant};
-use tracing::Instrument;
+use std::sync::Arc;
+use std::time::Instant;
 
 use std::io;
 
@@ -74,7 +71,7 @@ use std::io;
 /// `set_connect_options` and `get_connect_options` were removed in 0.9.0 because they complicated
 /// the pool internals. They can be reimplemented by capturing a mutex, or similar, in the callback.
 ///
-/// This example uses Postgres and [`tokio::sync::Mutex`] but may be adapted to any driver
+/// This example uses Postgres and [`tokio::sync::RwLock`] but may be adapted to any driver
 /// or `async-std`, respectively.
 ///
 /// ```rust,no_run

sqlx-core/src/pool/connection.rs

@@ -3,8 +3,6 @@ use std::ops::{Deref, DerefMut};
 use std::sync::Arc;
 use std::time::{Duration, Instant};
 
-use crate::sync::AsyncSemaphoreReleaser;
-
 use crate::connection::Connection;
 use crate::database::Database;
 use crate::error::Error;

sqlx-core/src/rt/mod.rs

@@ -62,7 +62,7 @@ pub async fn timeout_at<F: Future>(deadline: Instant, f: F) -> Result<F::Output,
     }
 
     #[cfg(not(feature = "_rt-async-std"))]
-    missing_rt((duration, f))
+    missing_rt((deadline, f))
 }
 
 pub async fn sleep(duration: Duration) {