diff --git a/examples/presence_state.rs b/examples/presence_state.rs
index 25b97d4f..4494dbf4 100644
--- a/examples/presence_state.rs
+++ b/examples/presence_state.rs
@@ -7,11 +7,6 @@ struct State {
     is_doing: String,
     flag: bool,
 }
-#[derive(Debug, serde::Serialize)]
-struct State2 {
-    is_doing: String,
-    business: String,
-}
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn snafu::Error>> {
diff --git a/src/core/event_engine/effect_dispatcher.rs b/src/core/event_engine/effect_dispatcher.rs
index ea219e49..6fa8559a 100644
--- a/src/core/event_engine/effect_dispatcher.rs
+++ b/src/core/event_engine/effect_dispatcher.rs
@@ -159,7 +159,6 @@ where
 mod should {
     use super::*;
     use crate::core::event_engine::Event;
-    use std::future::Future;
 
     struct TestEvent;
 
@@ -261,27 +260,6 @@ mod should {
         }
     }
 
-    #[derive(Clone)]
-    struct TestRuntime {}
-
-    #[async_trait::async_trait]
-    impl Runtime for TestRuntime {
-        fn spawn<R>(&self, _future: impl Future<Output = R> + Send + 'static)
-        where
-            R: Send + 'static,
-        {
-            // Do nothing.
-        }
-
-        async fn sleep(self, _delay: u64) {
-            // Do nothing.
-        }
-
-        async fn sleep_microseconds(self, _delay: u64) {
-            // Do nothing.
-        }
-    }
-
     #[test]
     fn create_not_managed_effect() {
         let (_tx, rx) = async_channel::bounded::<TestInvocation>(5);
diff --git a/src/core/retry_policy.rs b/src/core/retry_policy.rs
index 37dd0146..58e39c12 100644
--- a/src/core/retry_policy.rs
+++ b/src/core/retry_policy.rs
@@ -304,9 +304,7 @@ impl RequestRetryConfiguration {
     /// * `Some(delay_in_microseconds)` - The delay in microseconds.
     /// * `None` - If `delay_in_seconds` is `None`.
     fn delay_in_microseconds(delay_in_seconds: Option<u64>) -> Option<u64> {
-        let Some(delay_in_seconds) = delay_in_seconds else {
-            return None;
-        };
+        let delay_in_seconds = delay_in_seconds?;
 
         const MICROS_IN_SECOND: u64 = 1_000_000;
         let delay = delay_in_seconds * MICROS_IN_SECOND;
diff --git a/src/dx/access/mod.rs b/src/dx/access/mod.rs
index 03bf7f35..b83fad26 100644
--- a/src/dx/access/mod.rs
+++ b/src/dx/access/mod.rs
@@ -350,7 +350,7 @@ mod it_should {
             response: None,
             request_handler: Some(Box::new(|req| {
                 assert!(req.query_parameters.contains_key("timestamp"));
-                assert!(req.query_parameters.get("timestamp").is_some());
+                assert!(req.query_parameters.contains_key("timestamp"));
             })),
         };
 
@@ -368,7 +368,7 @@ mod it_should {
             response: None,
             request_handler: Some(Box::new(|req| {
                 assert!(req.query_parameters.contains_key("signature"));
-                assert!(req.query_parameters.get("signature").is_some());
+                assert!(req.query_parameters.contains_key("signature"));
                 assert!(req
                     .query_parameters
                     .get("signature")
diff --git a/src/dx/presence/mod.rs b/src/dx/presence/mod.rs
index b0baeb76..04980354 100644
--- a/src/dx/presence/mod.rs
+++ b/src/dx/presence/mod.rs
@@ -840,7 +840,7 @@ mod it_should {
             response: None,
             request_handler: Some(Box::new(|req| {
                 assert!(req.query_parameters.contains_key("state"));
-                assert!(req.query_parameters.get("state").is_some());
+                assert!(req.query_parameters.contains_key("state"));
 
                 let state = req.query_parameters.get("state").unwrap();
                 assert!(state.contains("channel_a"));
diff --git a/src/dx/subscribe/event_engine/state.rs b/src/dx/subscribe/event_engine/state.rs
index f5debe80..b8ad7ecf 100644
--- a/src/dx/subscribe/event_engine/state.rs
+++ b/src/dx/subscribe/event_engine/state.rs
@@ -329,7 +329,7 @@ impl SubscribeState {
                 // Merge stored cursor with service-provided.
                 let mut next_cursor = next_cursor.clone();
                 if let Some(cursor) = cursor {
-                    next_cursor.timetoken = cursor.timetoken.clone();
+                    next_cursor.timetoken.clone_from(&cursor.timetoken);
                 }
 
                 Some(self.transition_to(
diff --git a/src/dx/subscribe/subscription.rs b/src/dx/subscribe/subscription.rs
index 9bca92ff..66f57c60 100644
--- a/src/dx/subscribe/subscription.rs
+++ b/src/dx/subscribe/subscription.rs
@@ -537,7 +537,7 @@ where
                         .gt(current_cursor)
                         .then(|| *cursor_slot = Some(catchup_cursor));
                 } else {
-                    *cursor_slot = cursor.clone();
+                    cursor_slot.clone_from(&cursor);
                 }
             }
         }
diff --git a/src/dx/subscribe/subscription_manager.rs b/src/dx/subscribe/subscription_manager.rs
index 93cc16aa..e74b278a 100644
--- a/src/dx/subscribe/subscription_manager.rs
+++ b/src/dx/subscribe/subscription_manager.rs
@@ -346,7 +346,7 @@ where
         if !event_handlers.is_empty() {
             if let Some((_, handler)) = event_handlers.iter().next() {
                 if let Some(handler) = handler.upgrade().clone() {
-                    client = handler.client().upgrade().clone();
+                    client.clone_from(&handler.client().upgrade());
                 }
             }
         }
diff --git a/src/dx/subscribe/subscription_set.rs b/src/dx/subscribe/subscription_set.rs
index a967aceb..da2242c4 100644
--- a/src/dx/subscribe/subscription_set.rs
+++ b/src/dx/subscribe/subscription_set.rs
@@ -903,7 +903,7 @@ where
                         .gt(current_cursor)
                         .then(|| *cursor_slot = Some(catchup_cursor));
                 } else {
-                    *cursor_slot = cursor.clone();
+                    cursor_slot.clone_from(&cursor);
                 }
             }
         }
@@ -1174,7 +1174,7 @@ mod it_should {
             .into_iter()
             .map(|name| client.channel(name).subscription(None))
             .collect::<Vec<Subscription<_, _>>>();
-        let channels_3_subscriptions = vec![
+        let channels_3_subscriptions = [
             channels_1_subscriptions[0].clone(),
             channels_2_subscriptions[1].clone(),
         ];