diff --git a/protocols/gossipsub/src/behaviour.rs b/protocols/gossipsub/src/behaviour.rs
index 954c68ae..21dd7756 100644
--- a/protocols/gossipsub/src/behaviour.rs
+++ b/protocols/gossipsub/src/behaviour.rs
@@ -649,7 +649,7 @@ where
                     set.iter()
                         .filter(|p| {
                             self.explicit_peers.contains(*p)
-                                || !self.score_below_threshold(*p, |ts| ts.publish_threshold).0
+                                || !self.score_below_threshold(p, |ts| ts.publish_threshold).0
                         })
                         .cloned(),
                 );
@@ -946,14 +946,11 @@ where
             );
 
             // remove explicit peers, peers with negative scores, and backoffed peers
-            peers = peers
-                .into_iter()
-                .filter(|p| {
-                    !self.explicit_peers.contains(p)
-                        && !self.score_below_threshold(p, |_| 0.0).0
-                        && !self.backoffs.is_backoff_with_slack(topic_hash, p)
-                })
-                .collect();
+            peers.retain(|p| {
+                !self.explicit_peers.contains(p)
+                    && !self.score_below_threshold(p, |_| 0.0).0
+                    && !self.backoffs.is_backoff_with_slack(topic_hash, p)
+            });
 
             // Add up to mesh_n of them them to the mesh
             // NOTE: These aren't randomly added, currently FIFO
@@ -1625,7 +1622,7 @@ where
         //
         //TODO: Once signed records are spec'd: Can we use peerInfo without any IDs if they have a
         // signed peer record?
-        px = px.into_iter().filter(|p| p.peer_id.is_some()).collect();
+        px.retain(|p| p.peer_id.is_some());
         if px.len() > n {
             // only use at most prune_peers many random peers
             let mut rng = thread_rng();
@@ -3204,7 +3201,7 @@ where
             debug!("Peer disconnected: {}", peer_id);
             {
                 let topics = match self.peer_topics.get(peer_id) {
-                    Some(topics) => (topics),
+                    Some(topics) => topics,
                     None => {
                         debug_assert!(
                             self.blacklisted_peers.contains(peer_id),
diff --git a/protocols/kad/src/handler.rs b/protocols/kad/src/handler.rs
index bcadb57f..5be9ae17 100644
--- a/protocols/kad/src/handler.rs
+++ b/protocols/kad/src/handler.rs
@@ -658,14 +658,7 @@ where
                 let pos = self
                     .inbound_substreams
                     .iter()
-                    .position(|state| match state {
-                        InboundSubstreamState::WaitingUser(ref conn_id, _)
-                            if conn_id == &request_id.connec_unique_id =>
-                        {
-                            true
-                        }
-                        _ => false,
-                    });
+                    .position(|state| matches!(state, InboundSubstreamState::WaitingUser(ref conn_id, _) if conn_id == &request_id.connec_unique_id));
 
                 if let Some(pos) = pos {
                     let (conn_id, substream) = match self.inbound_substreams.remove(pos) {
@@ -737,14 +730,7 @@ where
                 let pos = self
                     .inbound_substreams
                     .iter()
-                    .position(|state| match state {
-                        InboundSubstreamState::WaitingUser(ref conn_id, _)
-                            if conn_id == &request_id.connec_unique_id =>
-                        {
-                            true
-                        }
-                        _ => false,
-                    });
+                    .position(|state| matches!(state, InboundSubstreamState::WaitingUser(ref conn_id, _) if conn_id == &request_id.connec_unique_id));
 
                 if let Some(pos) = pos {
                     let (conn_id, substream) = match self.inbound_substreams.remove(pos) {
diff --git a/protocols/mdns/src/behaviour/iface.rs b/protocols/mdns/src/behaviour/iface.rs
index c5bacced..b2d0506b 100644
--- a/protocols/mdns/src/behaviour/iface.rs
+++ b/protocols/mdns/src/behaviour/iface.rs
@@ -85,7 +85,7 @@ where
                 socket.bind(&SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), 5353).into())?;
                 socket.set_multicast_loop_v4(true)?;
                 socket.set_multicast_ttl_v4(255)?;
-                socket.join_multicast_v4(&*crate::IPV4_MDNS_MULTICAST_ADDRESS, &addr)?;
+                socket.join_multicast_v4(&crate::IPV4_MDNS_MULTICAST_ADDRESS, &addr)?;
                 U::from_std(UdpSocket::from(socket))?
             }
             IpAddr::V6(_) => {
@@ -96,7 +96,7 @@ where
                 socket.bind(&SocketAddr::new(IpAddr::V6(Ipv6Addr::UNSPECIFIED), 5353).into())?;
                 socket.set_multicast_loop_v6(true)?;
                 // TODO: find interface matching addr.
-                socket.join_multicast_v6(&*crate::IPV6_MDNS_MULTICAST_ADDRESS, 0)?;
+                socket.join_multicast_v6(&crate::IPV6_MDNS_MULTICAST_ADDRESS, 0)?;
                 U::from_std(UdpSocket::from(socket))?
             }
         };
diff --git a/protocols/mdns/src/behaviour/iface/dns.rs b/protocols/mdns/src/behaviour/iface/dns.rs
index 5bb190f4..4590e1e2 100644
--- a/protocols/mdns/src/behaviour/iface/dns.rs
+++ b/protocols/mdns/src/behaviour/iface/dns.rs
@@ -246,7 +246,7 @@ fn query_response_packet(id: u16, peer_id: &[u8], records: &[Vec<u8>], ttl: u32)
 fn duration_to_secs(duration: Duration) -> u32 {
     let secs = duration
         .as_secs()
-        .saturating_add(if duration.subsec_nanos() > 0 { 1 } else { 0 });
+        .saturating_add(u64::from(duration.subsec_nanos() > 0));
     cmp::min(secs, From::from(u32::max_value())) as u32
 }