diff --git a/actix-http/src/lib.rs b/actix-http/src/lib.rs
index b52e8179c..fab91be2b 100644
--- a/actix-http/src/lib.rs
+++ b/actix-http/src/lib.rs
@@ -7,6 +7,7 @@
     clippy::new_without_default,
     clippy::borrow_interior_mutable_const
 )]
+#![allow(clippy::manual_strip)] // Allow this to keep MSRV(1.42).
 
 #[macro_use]
 extern crate log;
diff --git a/src/lib.rs b/src/lib.rs
index 327cba954..edc8456ba 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -67,6 +67,7 @@
 
 #![deny(rust_2018_idioms)]
 #![allow(clippy::needless_doctest_main, clippy::type_complexity)]
+#![allow(clippy::rc_buffer)] // FXIME: We should take a closer look for the warnings at some point.
 #![doc(html_logo_url = "https://actix.rs/img/logo.png")]
 #![doc(html_favicon_url = "https://actix.rs/favicon.ico")]
 
diff --git a/src/scope.rs b/src/scope.rs
index 25b5366d8..2520fd7ae 100644
--- a/src/scope.rs
+++ b/src/scope.rs
@@ -58,7 +58,6 @@ type BoxedResponse = LocalBoxFuture<'static, Result<ServiceResponse, Error>>;
 ///  * /{project_id}/path1 - responds to all http method
 ///  * /{project_id}/path2 - `GET` requests
 ///  * /{project_id}/path3 - `HEAD` requests
-///
 pub struct Scope<T = ScopeEndpoint> {
     endpoint: T,
     rdef: String,
diff --git a/src/types/json.rs b/src/types/json.rs
index 8da5a3bdb..081a022e8 100644
--- a/src/types/json.rs
+++ b/src/types/json.rs
@@ -283,7 +283,7 @@ impl JsonConfig {
     fn from_req(req: &HttpRequest) -> &Self {
         req.app_data::<Self>()
             .or_else(|| req.app_data::<web::Data<Self>>().map(|d| d.as_ref()))
-            .unwrap_or_else(|| &DEFAULT_CONFIG)
+            .unwrap_or(&DEFAULT_CONFIG)
     }
 }
 
diff --git a/src/types/payload.rs b/src/types/payload.rs
index bbdd89525..4ff5ef4b4 100644
--- a/src/types/payload.rs
+++ b/src/types/payload.rs
@@ -284,7 +284,7 @@ impl PayloadConfig {
     fn from_req(req: &HttpRequest) -> &Self {
         req.app_data::<Self>()
             .or_else(|| req.app_data::<web::Data<Self>>().map(|d| d.as_ref()))
-            .unwrap_or_else(|| &DEFAULT_CONFIG)
+            .unwrap_or(&DEFAULT_CONFIG)
     }
 }