diff --git a/actix-files/src/service.rs b/actix-files/src/service.rs
index ec09af01c..d94fd5850 100644
--- a/actix-files/src/service.rs
+++ b/actix-files/src/service.rs
@@ -23,7 +23,7 @@ impl Deref for FilesService {
     type Target = FilesServiceInner;
 
     fn deref(&self) -> &Self::Target {
-        &*self.0
+        &self.0
     }
 }
 
diff --git a/actix-http/src/body/message_body.rs b/actix-http/src/body/message_body.rs
index bac2fece1..0cfaa8653 100644
--- a/actix-http/src/body/message_body.rs
+++ b/actix-http/src/body/message_body.rs
@@ -131,7 +131,7 @@ mod foreign_impls {
         type Error = B::Error;
 
         fn size(&self) -> BodySize {
-            (&**self).size()
+            (**self).size()
         }
 
         fn poll_next(
diff --git a/actix-http/src/body/utils.rs b/actix-http/src/body/utils.rs
index 194af47f8..0a6fb0c15 100644
--- a/actix-http/src/body/utils.rs
+++ b/actix-http/src/body/utils.rs
@@ -42,7 +42,7 @@ pub async fn to_bytes<B: MessageBody>(body: B) -> Result<Bytes, B::Error> {
         let body = body.as_mut();
 
         match ready!(body.poll_next(cx)) {
-            Some(Ok(bytes)) => buf.extend_from_slice(&*bytes),
+            Some(Ok(bytes)) => buf.extend_from_slice(&bytes),
             None => return Poll::Ready(Ok(())),
             Some(Err(err)) => return Poll::Ready(Err(err)),
         }
diff --git a/actix-http/src/h1/dispatcher_tests.rs b/actix-http/src/h1/dispatcher_tests.rs
index b3ee3d2bb..3eea859bf 100644
--- a/actix-http/src/h1/dispatcher_tests.rs
+++ b/actix-http/src/h1/dispatcher_tests.rs
@@ -637,7 +637,7 @@ async fn expect_handling() {
 
         if let DispatcherState::Normal { ref inner } = h1.inner {
             let io = inner.io.as_ref().unwrap();
-            let mut res = (&io.write_buf()[..]).to_owned();
+            let mut res = io.write_buf()[..].to_owned();
             stabilize_date_header(&mut res);
 
             assert_eq!(
@@ -699,7 +699,7 @@ async fn expect_eager() {
 
         if let DispatcherState::Normal { ref inner } = h1.inner {
             let io = inner.io.as_ref().unwrap();
-            let mut res = (&io.write_buf()[..]).to_owned();
+            let mut res = io.write_buf()[..].to_owned();
             stabilize_date_header(&mut res);
 
             // Despite the content-length header and even though the request payload has not
diff --git a/actix-http/src/header/map.rs b/actix-http/src/header/map.rs
index 8f6d1cead..28906e835 100644
--- a/actix-http/src/header/map.rs
+++ b/actix-http/src/header/map.rs
@@ -309,7 +309,7 @@ impl HeaderMap {
     pub fn get_all(&self, key: impl AsHeaderName) -> std::slice::Iter<'_, HeaderValue> {
         match self.get_value(key) {
             Some(value) => value.iter(),
-            None => (&[]).iter(),
+            None => [].iter(),
         }
     }
 
diff --git a/actix-http/src/requests/request.rs b/actix-http/src/requests/request.rs
index 0f8e78d46..ac358e8df 100644
--- a/actix-http/src/requests/request.rs
+++ b/actix-http/src/requests/request.rs
@@ -113,14 +113,14 @@ impl<P> Request<P> {
     #[inline]
     /// Http message part of the request
     pub fn head(&self) -> &RequestHead {
-        &*self.head
+        &self.head
     }
 
     #[inline]
     #[doc(hidden)]
     /// Mutable reference to a HTTP message part of the request
     pub fn head_mut(&mut self) -> &mut RequestHead {
-        &mut *self.head
+        &mut self.head
     }
 
     /// Mutable reference to the message's headers.
diff --git a/actix-http/src/responses/response.rs b/actix-http/src/responses/response.rs
index ceb158f65..03908d9ce 100644
--- a/actix-http/src/responses/response.rs
+++ b/actix-http/src/responses/response.rs
@@ -83,13 +83,13 @@ impl<B> Response<B> {
     /// Returns a reference to the head of this response.
     #[inline]
     pub fn head(&self) -> &ResponseHead {
-        &*self.head
+        &self.head
     }
 
     /// Returns a mutable reference to the head of this response.
     #[inline]
     pub fn head_mut(&mut self) -> &mut ResponseHead {
-        &mut *self.head
+        &mut self.head
     }
 
     /// Returns the status code of this response.
diff --git a/actix-http/src/ws/frame.rs b/actix-http/src/ws/frame.rs
index 3659b6c3b..c7e0427ea 100644
--- a/actix-http/src/ws/frame.rs
+++ b/actix-http/src/ws/frame.rs
@@ -313,7 +313,7 @@ mod tests {
     #[test]
     fn test_parse_frame_no_mask() {
         let mut buf = BytesMut::from(&[0b0000_0001u8, 0b0000_0001u8][..]);
-        buf.extend(&[1u8]);
+        buf.extend([1u8]);
 
         assert!(Parser::parse(&mut buf, true, 1024).is_err());
 
@@ -326,7 +326,7 @@ mod tests {
     #[test]
     fn test_parse_frame_max_size() {
         let mut buf = BytesMut::from(&[0b0000_0001u8, 0b0000_0010u8][..]);
-        buf.extend(&[1u8, 1u8]);
+        buf.extend([1u8, 1u8]);
 
         assert!(Parser::parse(&mut buf, true, 1).is_err());
 
@@ -340,9 +340,9 @@ mod tests {
     fn test_parse_frame_max_size_recoverability() {
         let mut buf = BytesMut::new();
         // The first text frame with length == 2, payload doesn't matter.
-        buf.extend(&[0b0000_0001u8, 0b0000_0010u8, 0b0000_0000u8, 0b0000_0000u8]);
+        buf.extend([0b0000_0001u8, 0b0000_0010u8, 0b0000_0000u8, 0b0000_0000u8]);
         // Next binary frame with length == 2 and payload == `[0x1111_1111u8, 0x1111_1111u8]`.
-        buf.extend(&[0b0000_0010u8, 0b0000_0010u8, 0b1111_1111u8, 0b1111_1111u8]);
+        buf.extend([0b0000_0010u8, 0b0000_0010u8, 0b1111_1111u8, 0b1111_1111u8]);
 
         assert_eq!(buf.len(), 8);
         assert!(matches!(
diff --git a/actix-http/src/ws/proto.rs b/actix-http/src/ws/proto.rs
index 01fe9dd3c..7222168b7 100644
--- a/actix-http/src/ws/proto.rs
+++ b/actix-http/src/ws/proto.rs
@@ -244,7 +244,7 @@ pub fn hash_key(key: &[u8]) -> [u8; 28] {
     };
 
     let mut hash_b64 = [0; 28];
-    let n = base64::encode_config_slice(&hash, base64::STANDARD, &mut hash_b64);
+    let n = base64::encode_config_slice(hash, base64::STANDARD, &mut hash_b64);
     assert_eq!(n, 28);
 
     hash_b64
diff --git a/actix-http/tests/test_rustls.rs b/actix-http/tests/test_rustls.rs
index 2bbf1524b..d9ff42b7d 100644
--- a/actix-http/tests/test_rustls.rs
+++ b/actix-http/tests/test_rustls.rs
@@ -41,7 +41,7 @@ where
         let body = stream.as_mut();
 
         match ready!(body.poll_next(cx)) {
-            Some(Ok(bytes)) => buf.extend_from_slice(&*bytes),
+            Some(Ok(bytes)) => buf.extend_from_slice(&bytes),
             None => return Poll::Ready(Ok(())),
             Some(Err(err)) => return Poll::Ready(Err(err)),
         }
diff --git a/actix-multipart/src/server.rs b/actix-multipart/src/server.rs
index 6985cb56d..c3757177f 100644
--- a/actix-multipart/src/server.rs
+++ b/actix-multipart/src/server.rs
@@ -289,10 +289,8 @@ impl InnerMultipart {
                 match self.state {
                     // read until first boundary
                     InnerState::FirstBoundary => {
-                        match InnerMultipart::skip_until_boundary(
-                            &mut *payload,
-                            &self.boundary,
-                        )? {
+                        match InnerMultipart::skip_until_boundary(&mut payload, &self.boundary)?
+                        {
                             Some(eof) => {
                                 if eof {
                                     self.state = InnerState::Eof;
@@ -306,7 +304,7 @@ impl InnerMultipart {
                     }
                     // read boundary
                     InnerState::Boundary => {
-                        match InnerMultipart::read_boundary(&mut *payload, &self.boundary)? {
+                        match InnerMultipart::read_boundary(&mut payload, &self.boundary)? {
                             None => return Poll::Pending,
                             Some(eof) => {
                                 if eof {
@@ -323,7 +321,7 @@ impl InnerMultipart {
 
                 // read field headers for next field
                 if self.state == InnerState::Headers {
-                    if let Some(headers) = InnerMultipart::read_headers(&mut *payload)? {
+                    if let Some(headers) = InnerMultipart::read_headers(&mut payload)? {
                         self.state = InnerState::Boundary;
                         headers
                     } else {
@@ -652,9 +650,9 @@ impl InnerField {
         let result = if let Some(mut payload) = self.payload.as_ref().unwrap().get_mut(s) {
             if !self.eof {
                 let res = if let Some(ref mut len) = self.length {
-                    InnerField::read_len(&mut *payload, len)
+                    InnerField::read_len(&mut payload, len)
                 } else {
-                    InnerField::read_stream(&mut *payload, &self.boundary)
+                    InnerField::read_stream(&mut payload, &self.boundary)
                 };
 
                 match res {
diff --git a/actix-router/src/path.rs b/actix-router/src/path.rs
index 5eef1c1e7..34dabcfbe 100644
--- a/actix-router/src/path.rs
+++ b/actix-router/src/path.rs
@@ -242,6 +242,7 @@ mod tests {
 
     use super::*;
 
+    #[allow(clippy::needless_borrow)]
     #[test]
     fn deref_impls() {
         let mut foo = Path::new("/foo");
diff --git a/actix-router/src/resource.rs b/actix-router/src/resource.rs
index 3c6754aeb..f198115ad 100644
--- a/actix-router/src/resource.rs
+++ b/actix-router/src/resource.rs
@@ -1503,31 +1503,31 @@ mod tests {
     fn build_path_list() {
         let mut s = String::new();
         let resource = ResourceDef::new("/user/{item1}/test");
-        assert!(resource.resource_path_from_iter(&mut s, &mut (&["user1"]).iter()));
+        assert!(resource.resource_path_from_iter(&mut s, &mut ["user1"].iter()));
         assert_eq!(s, "/user/user1/test");
 
         let mut s = String::new();
         let resource = ResourceDef::new("/user/{item1}/{item2}/test");
-        assert!(resource.resource_path_from_iter(&mut s, &mut (&["item", "item2"]).iter()));
+        assert!(resource.resource_path_from_iter(&mut s, &mut ["item", "item2"].iter()));
         assert_eq!(s, "/user/item/item2/test");
 
         let mut s = String::new();
         let resource = ResourceDef::new("/user/{item1}/{item2}");
-        assert!(resource.resource_path_from_iter(&mut s, &mut (&["item", "item2"]).iter()));
+        assert!(resource.resource_path_from_iter(&mut s, &mut ["item", "item2"].iter()));
         assert_eq!(s, "/user/item/item2");
 
         let mut s = String::new();
         let resource = ResourceDef::new("/user/{item1}/{item2}/");
-        assert!(resource.resource_path_from_iter(&mut s, &mut (&["item", "item2"]).iter()));
+        assert!(resource.resource_path_from_iter(&mut s, &mut ["item", "item2"].iter()));
         assert_eq!(s, "/user/item/item2/");
 
         let mut s = String::new();
-        assert!(!resource.resource_path_from_iter(&mut s, &mut (&["item"]).iter()));
+        assert!(!resource.resource_path_from_iter(&mut s, &mut ["item"].iter()));
 
         let mut s = String::new();
-        assert!(resource.resource_path_from_iter(&mut s, &mut (&["item", "item2"]).iter()));
+        assert!(resource.resource_path_from_iter(&mut s, &mut ["item", "item2"].iter()));
         assert_eq!(s, "/user/item/item2/");
-        assert!(!resource.resource_path_from_iter(&mut s, &mut (&["item"]).iter()));
+        assert!(!resource.resource_path_from_iter(&mut s, &mut ["item"].iter()));
 
         let mut s = String::new();
         assert!(resource.resource_path_from_iter(&mut s, &mut vec!["item", "item2"].iter()));
@@ -1604,10 +1604,10 @@ mod tests {
         let resource = ResourceDef::new("/user/{item1}*");
 
         let mut s = String::new();
-        assert!(!resource.resource_path_from_iter(&mut s, &mut (&[""; 0]).iter()));
+        assert!(!resource.resource_path_from_iter(&mut s, &mut [""; 0].iter()));
 
         let mut s = String::new();
-        assert!(resource.resource_path_from_iter(&mut s, &mut (&["user1"]).iter()));
+        assert!(resource.resource_path_from_iter(&mut s, &mut ["user1"].iter()));
         assert_eq!(s, "/user/user1");
 
         let mut s = String::new();
diff --git a/actix-web/src/app.rs b/actix-web/src/app.rs
index 213c8beff..ec37ff8a4 100644
--- a/actix-web/src/app.rs
+++ b/actix-web/src/app.rs
@@ -682,7 +682,7 @@ mod tests {
                     "/test",
                     web::get().to(|req: HttpRequest| {
                         HttpResponse::Ok()
-                            .body(req.url_for("youtube", &["12345"]).unwrap().to_string())
+                            .body(req.url_for("youtube", ["12345"]).unwrap().to_string())
                     }),
                 ),
         )
diff --git a/actix-web/src/app_service.rs b/actix-web/src/app_service.rs
index 28ff8c614..0b5ba2ab6 100644
--- a/actix-web/src/app_service.rs
+++ b/actix-web/src/app_service.rs
@@ -173,7 +173,7 @@ impl AppInitServiceState {
 
     #[inline]
     pub(crate) fn rmap(&self) -> &ResourceMap {
-        &*self.rmap
+        &self.rmap
     }
 
     #[inline]
diff --git a/actix-web/src/config.rs b/actix-web/src/config.rs
index 58a099c75..68bea34ca 100644
--- a/actix-web/src/config.rs
+++ b/actix-web/src/config.rs
@@ -344,7 +344,7 @@ mod tests {
                     "/test",
                     web::get().to(|req: HttpRequest| {
                         HttpResponse::Ok()
-                            .body(req.url_for("youtube", &["12345"]).unwrap().to_string())
+                            .body(req.url_for("youtube", ["12345"]).unwrap().to_string())
                     }),
                 ),
         )
diff --git a/actix-web/src/http/header/cache_control.rs b/actix-web/src/http/header/cache_control.rs
index 490d36558..37629313e 100644
--- a/actix-web/src/http/header/cache_control.rs
+++ b/actix-web/src/http/header/cache_control.rs
@@ -176,7 +176,7 @@ impl str::FromStr for CacheDirective {
 
             _ => match s.find('=') {
                 Some(idx) if idx + 1 < s.len() => {
-                    match (&s[..idx], (&s[idx + 1..]).trim_matches('"')) {
+                    match (&s[..idx], s[idx + 1..].trim_matches('"')) {
                         ("max-age", secs) => secs.parse().map(MaxAge).map_err(Some),
                         ("max-stale", secs) => secs.parse().map(MaxStale).map_err(Some),
                         ("min-fresh", secs) => secs.parse().map(MinFresh).map_err(Some),
diff --git a/actix-web/src/request.rs b/actix-web/src/request.rs
index e2a9bd4e5..6a32bf838 100644
--- a/actix-web/src/request.rs
+++ b/actix-web/src/request.rs
@@ -219,7 +219,7 @@ impl HttpRequest {
     /// for urls that do not contain variable parts.
     pub fn url_for_static(&self, name: &str) -> Result<url::Url, UrlGenerationError> {
         const NO_PARAMS: [&str; 0] = [];
-        self.url_for(name, &NO_PARAMS)
+        self.url_for(name, NO_PARAMS)
     }
 
     /// Get a reference to a `ResourceMap` of current application.
@@ -306,7 +306,7 @@ impl HttpRequest {
 
     #[inline]
     fn app_state(&self) -> &AppInitServiceState {
-        &*self.inner.app_state
+        &self.inner.app_state
     }
 
     /// Load request cookies.
@@ -583,14 +583,14 @@ mod tests {
             .to_http_request();
 
         assert_eq!(
-            req.url_for("unknown", &["test"]),
+            req.url_for("unknown", ["test"]),
             Err(UrlGenerationError::ResourceNotFound)
         );
         assert_eq!(
-            req.url_for("index", &["test"]),
+            req.url_for("index", ["test"]),
             Err(UrlGenerationError::NotEnoughElements)
         );
-        let url = req.url_for("index", &["test", "html"]);
+        let url = req.url_for("index", ["test", "html"]);
         assert_eq!(
             url.ok().unwrap().as_str(),
             "http://www.rust-lang.org/user/test.html"
@@ -646,7 +646,7 @@ mod tests {
         rmap.add(&mut rdef, None);
 
         let req = TestRequest::default().rmap(rmap).to_http_request();
-        let url = req.url_for("youtube", &["oHg5SJYRHA0"]);
+        let url = req.url_for("youtube", ["oHg5SJYRHA0"]);
         assert_eq!(
             url.ok().unwrap().as_str(),
             "https://youtube.com/watch/oHg5SJYRHA0"
diff --git a/actix-web/src/response/builder.rs b/actix-web/src/response/builder.rs
index f50aad9f4..120d4c358 100644
--- a/actix-web/src/response/builder.rs
+++ b/actix-web/src/response/builder.rs
@@ -457,7 +457,7 @@ mod tests {
         assert_eq!(ct, HeaderValue::from_static("application/json"));
         assert_body_eq!(res, br#"["v1","v2","v3"]"#);
 
-        let res = HttpResponse::Ok().json(&["v1", "v2", "v3"]);
+        let res = HttpResponse::Ok().json(["v1", "v2", "v3"]);
         let ct = res.headers().get(CONTENT_TYPE).unwrap();
         assert_eq!(ct, HeaderValue::from_static("application/json"));
         assert_body_eq!(res, br#"["v1","v2","v3"]"#);
diff --git a/actix-web/src/rmap.rs b/actix-web/src/rmap.rs
index 6a1a187b2..6e10717c3 100644
--- a/actix-web/src/rmap.rs
+++ b/actix-web/src/rmap.rs
@@ -449,12 +449,12 @@ mod tests {
         let req = req.to_http_request();
 
         let url = rmap
-            .url_for(&req, "post", &["u123", "foobar"])
+            .url_for(&req, "post", ["u123", "foobar"])
             .unwrap()
             .to_string();
         assert_eq!(url, "http://localhost:8888/user/u123/post/foobar");
 
-        assert!(rmap.url_for(&req, "missing", &["u123"]).is_err());
+        assert!(rmap.url_for(&req, "missing", ["u123"]).is_err());
     }
 
     #[test]
@@ -490,7 +490,7 @@ mod tests {
         assert_eq!(url.path(), OUTPUT);
 
         assert!(rmap.url_for(&req, "external.2", INPUT).is_err());
-        assert!(rmap.url_for(&req, "external.2", &[""]).is_err());
+        assert!(rmap.url_for(&req, "external.2", [""]).is_err());
     }
 
     #[test]
@@ -524,7 +524,7 @@ mod tests {
         let req = req.to_http_request();
 
         assert_eq!(
-            rmap.url_for(&req, "duck", &["abcd"]).unwrap().to_string(),
+            rmap.url_for(&req, "duck", ["abcd"]).unwrap().to_string(),
             "https://duck.com/abcd"
         );
     }
@@ -552,9 +552,9 @@ mod tests {
 
         let req = crate::test::TestRequest::default().to_http_request();
 
-        let url = rmap.url_for(&req, "nested", &[""; 0]).unwrap().to_string();
+        let url = rmap.url_for(&req, "nested", [""; 0]).unwrap().to_string();
         assert_eq!(url, "http://localhost:8080/bar/nested");
 
-        assert!(rmap.url_for(&req, "missing", &["u123"]).is_err());
+        assert!(rmap.url_for(&req, "missing", ["u123"]).is_err());
     }
 }
diff --git a/actix-web/src/scope.rs b/actix-web/src/scope.rs
index 07eb1093a..9af05674b 100644
--- a/actix-web/src/scope.rs
+++ b/actix-web/src/scope.rs
@@ -1133,7 +1133,7 @@ mod tests {
                     "/",
                     web::get().to(|req: HttpRequest| {
                         HttpResponse::Ok()
-                            .body(req.url_for("youtube", &["xxxxxx"]).unwrap().to_string())
+                            .body(req.url_for("youtube", ["xxxxxx"]).unwrap().to_string())
                     }),
                 );
             }));
@@ -1152,8 +1152,7 @@ mod tests {
         let srv = init_service(App::new().service(web::scope("/a").service(
             web::scope("/b").service(web::resource("/c/{stuff}").name("c").route(
                 web::get().to(|req: HttpRequest| {
-                    HttpResponse::Ok()
-                        .body(format!("{}", req.url_for("c", &["12345"]).unwrap()))
+                    HttpResponse::Ok().body(format!("{}", req.url_for("c", ["12345"]).unwrap()))
                 }),
             )),
         )))
diff --git a/awc/src/client/pool.rs b/awc/src/client/pool.rs
index cc3e4d7c0..5655b5845 100644
--- a/awc/src/client/pool.rs
+++ b/awc/src/client/pool.rs
@@ -97,7 +97,7 @@ where
     type Target = ConnectionPoolInnerPriv<Io>;
 
     fn deref(&self) -> &Self::Target {
-        &*self.0
+        &self.0
     }
 }
 
diff --git a/awc/src/ws.rs b/awc/src/ws.rs
index d8ed4c879..b316f68b4 100644
--- a/awc/src/ws.rs
+++ b/awc/src/ws.rs
@@ -321,7 +321,7 @@ impl WebsocketsRequest {
         // Generate a random key for the `Sec-WebSocket-Key` header which is a base64-encoded
         // (see RFC 4648 §4) value that, when decoded, is 16 bytes in length (RFC 6455 §1.3).
         let sec_key: [u8; 16] = rand::random();
-        let key = base64::encode(&sec_key);
+        let key = base64::encode(sec_key);
 
         self.head.headers.insert(
             header::SEC_WEBSOCKET_KEY,
@@ -513,7 +513,7 @@ mod tests {
             .origin("test-origin")
             .max_frame_size(100)
             .server_mode()
-            .protocols(&["v1", "v2"])
+            .protocols(["v1", "v2"])
             .set_header_if_none(header::CONTENT_TYPE, "json")
             .set_header_if_none(header::CONTENT_TYPE, "text")
             .cookie(Cookie::build("cookie1", "value1").finish());
diff --git a/awc/tests/test_client.rs b/awc/tests/test_client.rs
index 165d8faf0..c4b468eeb 100644
--- a/awc/tests/test_client.rs
+++ b/awc/tests/test_client.rs
@@ -707,8 +707,7 @@ async fn client_cookie_handling() {
 
                 async move {
                     // Check cookies were sent correctly
-                    let res: Result<(), Error> = req
-                        .cookie("cookie1")
+                    req.cookie("cookie1")
                         .ok_or(())
                         .and_then(|c1| {
                             if c1.value() == "value1" {
@@ -725,16 +724,10 @@ async fn client_cookie_handling() {
                                 Err(())
                             }
                         })
-                        .map_err(|_| Error::from(IoError::from(ErrorKind::NotFound)));
+                        .map_err(|_| Error::from(IoError::from(ErrorKind::NotFound)))?;
 
-                    if let Err(e) = res {
-                        Err(e)
-                    } else {
-                        // Send some cookies back
-                        Ok::<_, Error>(
-                            HttpResponse::Ok().cookie(cookie1).cookie(cookie2).finish(),
-                        )
-                    }
+                    // Send some cookies back
+                    Ok::<_, Error>(HttpResponse::Ok().cookie(cookie1).cookie(cookie2).finish())
                 }
             }),
         )