diff --git a/crates/dht/src/dht.rs b/crates/dht/src/dht.rs
index 88a9592..a1b23ba 100644
--- a/crates/dht/src/dht.rs
+++ b/crates/dht/src/dht.rs
@@ -498,7 +498,6 @@ impl DhtWorker {
             let mut futs = FuturesUnordered::new();
             // bootstrap
             for addr in bootstrap_addrs.iter() {
-                let addr = addr;
                 let this = &self;
                 let in_tx = &in_tx;
                 futs.push(async move {
diff --git a/crates/librqbit/src/chunk_tracker.rs b/crates/librqbit/src/chunk_tracker.rs
index 47c306d..c013588 100644
--- a/crates/librqbit/src/chunk_tracker.rs
+++ b/crates/librqbit/src/chunk_tracker.rs
@@ -59,7 +59,7 @@ impl ChunkTracker {
     pub fn new(needed_pieces: BF, have_pieces: BF, lengths: Lengths) -> Self {
         // TODO: ideally this needs to be a list based on needed files, e.g.
         // last needed piece for each file. But let's keep simple for now.
-        let last_needed_piece_id = needed_pieces.iter_ones().rev().next();
+        let last_needed_piece_id = needed_pieces.iter_ones().next_back();
 
         // The last pieces first. Often important information is stored in the last piece.
         // E.g. if it's a video file, than the last piece often contains some index, or just
diff --git a/crates/librqbit/src/torrent_manager.rs b/crates/librqbit/src/torrent_manager.rs
index 6c5b961..d3826e8 100644
--- a/crates/librqbit/src/torrent_manager.rs
+++ b/crates/librqbit/src/torrent_manager.rs
@@ -160,7 +160,7 @@ fn make_lengths<ByteBuf: AsRef<[u8]>>(
     Lengths::new(total_length, torrent.piece_length, None)
 }
 
-fn ensure_file_length(file: &mut File, length: u64) -> anyhow::Result<()> {
+fn ensure_file_length(file: &File, length: u64) -> anyhow::Result<()> {
     Ok(file.set_len(length)?)
 }
 
@@ -237,7 +237,7 @@ impl TorrentManager {
                     continue;
                 }
                 let now = Instant::now();
-                if let Err(err) = ensure_file_length(&mut file.lock(), length) {
+                if let Err(err) = ensure_file_length(&file.lock(), length) {
                     warn!(
                         "Error setting length for file {:?} to {}: {:#?}",
                         name, length, err
diff --git a/crates/peer_binary_protocol/src/extended/ut_metadata.rs b/crates/peer_binary_protocol/src/extended/ut_metadata.rs
index d2f7be3..56d7924 100644
--- a/crates/peer_binary_protocol/src/extended/ut_metadata.rs
+++ b/crates/peer_binary_protocol/src/extended/ut_metadata.rs
@@ -132,12 +132,10 @@ impl<'a, ByteBuf: 'a> UtMetadata<ByteBuf> {
                 }
                 Ok(UtMetadata::Reject(message.piece))
             }
-            other => {
-                return Err(MessageDeserializeError::Other(anyhow::anyhow!(
-                    "unrecognized ut_metadata message type {}",
-                    other
-                )))
-            }
+            other => Err(MessageDeserializeError::Other(anyhow::anyhow!(
+                "unrecognized ut_metadata message type {}",
+                other
+            ))),
         }
     }
 }