chore: fix clippy warnings (#6466)

tokio-stream/src/stream_map.rs

@@ -467,10 +467,10 @@ impl<K, V> StreamMap<K, V> {
     /// assert!(map.remove(&1).is_some());
     /// assert!(map.remove(&1).is_none());
     /// ```
-    pub fn remove<Q: ?Sized>(&mut self, k: &Q) -> Option<V>
+    pub fn remove<Q>(&mut self, k: &Q) -> Option<V>
     where
         K: Borrow<Q>,
-        Q: Hash + Eq,
+        Q: Hash + Eq + ?Sized,
     {
         for i in 0..self.entries.len() {
             if self.entries[i].0.borrow() == k {
@@ -496,10 +496,10 @@ impl<K, V> StreamMap<K, V> {
     /// assert_eq!(map.contains_key(&1), true);
     /// assert_eq!(map.contains_key(&2), false);
     /// ```
-    pub fn contains_key<Q: ?Sized>(&self, k: &Q) -> bool
+    pub fn contains_key<Q>(&self, k: &Q) -> bool
     where
         K: Borrow<Q>,
-        Q: Hash + Eq,
+        Q: Hash + Eq + ?Sized,
     {
         for i in 0..self.entries.len() {
             if self.entries[i].0.borrow() == k {

tokio-stream/tests/async_send_sync.rs

@@ -15,18 +15,21 @@ fn require_unpin<T: Unpin>(_t: &T) {}
 #[allow(dead_code)]
 struct Invalid;
 
+#[allow(unused)]
 trait AmbiguousIfSend<A> {
     fn some_item(&self) {}
 }
 impl<T: ?Sized> AmbiguousIfSend<()> for T {}
 impl<T: ?Sized + Send> AmbiguousIfSend<Invalid> for T {}
 
+#[allow(unused)]
 trait AmbiguousIfSync<A> {
     fn some_item(&self) {}
 }
 impl<T: ?Sized> AmbiguousIfSync<()> for T {}
 impl<T: ?Sized + Sync> AmbiguousIfSync<Invalid> for T {}
 
+#[allow(unused)]
 trait AmbiguousIfUnpin<A> {
     fn some_item(&self) {}
 }

tokio-stream/tests/stream_timeout.rs

@@ -1,7 +1,7 @@
 #![cfg(all(feature = "time", feature = "sync", feature = "io-util"))]
 
 use tokio::time::{self, sleep, Duration};
-use tokio_stream::{self, StreamExt};
+use tokio_stream::StreamExt;
 use tokio_test::*;
 
 use futures::stream;