Fix clippy warnings

lib/src/network/stats.rs

@@ -89,10 +89,6 @@ pub(super) struct Throughput {
 }
 
 impl Throughput {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
     /// Returns the current throughput (in bytes per second), given the current total amount of
     /// bytes (sent or received) and the current time.
     ///

lib/src/sync.rs

@@ -643,21 +643,10 @@ pub(crate) mod delay_map {
             Some(item.value)
         }
 
-        pub fn drain(&mut self) -> impl Iterator<Item = (K, V)> + '_ {
-            self.items.drain().map(|(key, item)| {
-                self.delays.remove(&item.delay_key);
-                (key, item.value)
-            })
-        }
-
         pub fn len(&self) -> usize {
             self.items.len()
         }
 
-        // pub fn is_empty(&self) -> bool {
-        //     self.items.is_empty()
-        // }
-
         /// Poll for the next expired item. This can be wrapped in `future::poll_fn` and awaited.
         /// Returns `Poll::Ready(None)` if the map is empty.
         pub fn poll_expired(&mut self, cx: &mut Context<'_>) -> Poll<Option<(K, V)>> {

lib/src/versioned.rs

@@ -56,6 +56,9 @@ impl<E> Container<E> for Vec<E> {
 }
 
 /// Container for outdated items that discards them.
+// TODO: Clippy complains that `Discard` is never constructed in rust 1.81.0
+// but wouldn't compile without `Default` because `Container` requires it.
+#[allow(dead_code)]
 #[derive(Default)]
 pub(crate) struct Discard;