diff --git a/.cargo/config.toml b/.cargo/config.toml
index 03a995c7..f96081ae 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -5,18 +5,21 @@ ci-doctest = "test --workspace --all-features --doc --no-fail-fast -- --nocaptur
 
 # just check the library (without dev deps)
 ci-check-min = "hack --workspace check --no-default-features"
-ci-check-lib = "hack --workspace --feature-powerset --exclude-features io-uring check"
+ci-check-lib = "hack --workspace --feature-powerset --exclude-features=io-uring check"
 ci-check-lib-linux = "hack --workspace --feature-powerset check"
 
 # check everything
-ci-check = "hack --workspace --feature-powerset --exclude-features io-uring check --tests --examples"
+ci-check = "hack --workspace --feature-powerset --exclude-features=io-uring check --tests --examples"
 ci-check-linux = "hack --workspace --feature-powerset check --tests --examples"
 
 # tests avoiding io-uring feature
 ci-test = "hack test --workspace --exclude=actix-rt --exclude=actix-server --all-features --lib --tests --no-fail-fast -- --nocapture"
-ci-test-rt = "    hack --feature-powerset --exclude-features io-uring test --package=actix-rt     --lib --tests --no-fail-fast -- --nocapture"
-ci-test-server = "hack --feature-powerset --exclude-features io-uring test --package=actix-server --lib --tests --no-fail-fast -- --nocapture"
+ci-test-rt = "    hack --feature-powerset --exclude-features=io-uring test --package=actix-rt     --lib --tests --no-fail-fast -- --nocapture"
+ci-test-server = "hack --feature-powerset --exclude-features=io-uring test --package=actix-server --lib --tests --no-fail-fast -- --nocapture"
 
 # test with io-uring feature
 ci-test-rt-linux = "    hack --feature-powerset test --package=actix-rt     --lib --tests --no-fail-fast -- --nocapture"
 ci-test-server-linux = "hack --feature-powerset test --package=actix-server --lib --tests --no-fail-fast -- --nocapture"
+
+# test lower msrv
+ci-test-lower-msrv = "hack --workspace --feature-powerset test --lib --tests --no-fail-fast -- --nocapture"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 45841fb8..9a0b9c1f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
           - { name: Windows (MinGW), os: windows-latest, triple: x86_64-pc-windows-gnu }
           - { name: Windows (32-bit), os: windows-latest, triple: i686-pc-windows-msvc }
         version:
-          - 1.46.0 # MSRV
+          - 1.52.0 # MSRV for -server and -tls
           - stable
           - nightly
 
@@ -64,8 +64,7 @@ jobs:
 
       # - name: Generate Cargo.lock
       #   uses: actions-rs/cargo@v1
-      #   with:
-      #     command: generate-lockfile
+      #   with: { command: generate-lockfile }
       # - name: Cache Dependencies
       #   uses: Swatinem/rust-cache@v1.2.0
 
@@ -117,26 +116,66 @@ jobs:
           cargo ci-test-rt-linux
           cargo ci-test-server-linux
 
-      - name: Generate coverage file
-        if: >
-          matrix.target.os == 'ubuntu-latest'
-          && matrix.version == 'stable'
-          && github.ref == 'refs/heads/master'
+      - name: Clear the cargo caches
         run: |
-          cargo install cargo-tarpaulin
-          cargo tarpaulin --out Xml --verbose
-      - name: Upload to Codecov
-        if: >
-          matrix.target.os == 'ubuntu-latest'
-          && matrix.version == 'stable'
-          && github.ref == 'refs/heads/master'
-        uses: codecov/codecov-action@v1
-        with: { file: cobertura.xml }
+          cargo install cargo-cache --version 0.6.2 --no-default-features --features ci-autoclean
+          cargo-cache
+  
+  build_and_test_lower_msrv:
+    name: Linux / 1.46 (lower MSRV)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install 1.46.0 # MSRV for all but -server and -tls
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.46.0-x86_64-unknown-linux-gnu
+          profile: minimal
+          override: true
+
+      - name: Install cargo-hack
+        uses: actions-rs/cargo@v1
+        with:
+          command: install
+          args: cargo-hack
+
+      - name: tests
+        run: cargo ci-test-lower-msrv
 
       - name: Clear the cargo caches
         run: |
           cargo install cargo-cache --version 0.6.2 --no-default-features --features ci-autoclean
           cargo-cache
+  
+  coverage:
+    name: coverage
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Rust (nightly)
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable-x86_64-unknown-linux-gnu
+          profile: minimal
+          override: true
+
+      - name: Generate Cargo.lock
+        uses: actions-rs/cargo@v1
+        with: { command: generate-lockfile }
+      - name: Cache Dependencies
+        uses: Swatinem/rust-cache@v1.3.0
+    
+      - name: Generate coverage file
+        if: github.ref == 'refs/heads/master'
+        run: |
+          cargo install cargo-tarpaulin
+          cargo tarpaulin --out Xml --verbose
+      - name: Upload to Codecov
+        if: github.ref == 'refs/heads/master'
+        uses: codecov/codecov-action@v1
+        with: { file: cobertura.xml }
 
   rustdoc:
     name: rustdoc
diff --git a/actix-codec/src/framed.rs b/actix-codec/src/framed.rs
index a3a13f4d..5345314b 100644
--- a/actix-codec/src/framed.rs
+++ b/actix-codec/src/framed.rs
@@ -178,7 +178,7 @@ impl<T, U> Framed<T, U> {
         U: Decoder,
     {
         loop {
-            let mut this = self.as_mut().project();
+            let this = self.as_mut().project();
             // Repeatedly call `decode` or `decode_eof` as long as it is "readable". Readable is
             // defined as not having returned `None`. If the upstream has returned EOF, and the
             // decoder is no longer readable, it can be assumed that the decoder will never become
@@ -186,7 +186,7 @@ impl<T, U> Framed<T, U> {
 
             if this.flags.contains(Flags::READABLE) {
                 if this.flags.contains(Flags::EOF) {
-                    match this.codec.decode_eof(&mut this.read_buf) {
+                    match this.codec.decode_eof(this.read_buf) {
                         Ok(Some(frame)) => return Poll::Ready(Some(Ok(frame))),
                         Ok(None) => return Poll::Ready(None),
                         Err(e) => return Poll::Ready(Some(Err(e))),
@@ -195,7 +195,7 @@ impl<T, U> Framed<T, U> {
 
                 log::trace!("attempting to decode a frame");
 
-                match this.codec.decode(&mut this.read_buf) {
+                match this.codec.decode(this.read_buf) {
                     Ok(Some(frame)) => {
                         log::trace!("frame decoded from buffer");
                         return Poll::Ready(Some(Ok(frame)));
diff --git a/actix-macros/Cargo.toml b/actix-macros/Cargo.toml
index ea1b51d0..bfda142d 100644
--- a/actix-macros/Cargo.toml
+++ b/actix-macros/Cargo.toml
@@ -22,4 +22,5 @@ syn = { version = "^1", features = ["full"] }
 actix-rt = "2.0.0"
 
 futures-util = { version = "0.3.7", default-features = false }
+rustversion = "1"
 trybuild = "1"
diff --git a/actix-macros/src/lib.rs b/actix-macros/src/lib.rs
index 4be79178..dae08681 100644
--- a/actix-macros/src/lib.rs
+++ b/actix-macros/src/lib.rs
@@ -198,5 +198,5 @@ pub fn test(args: TokenStream, item: TokenStream) -> TokenStream {
 fn input_and_compile_error(mut item: TokenStream, err: syn::Error) -> TokenStream {
     let compile_err = TokenStream::from(err.to_compile_error());
     item.extend(compile_err);
-    return item;
+    item
 }
diff --git a/actix-macros/tests/trybuild.rs b/actix-macros/tests/trybuild.rs
index c7f4a5ca..2af99636 100644
--- a/actix-macros/tests/trybuild.rs
+++ b/actix-macros/tests/trybuild.rs
@@ -1,3 +1,4 @@
+#[rustversion::stable(1.46)] // MSRV
 #[test]
 fn compile_macros() {
     let t = trybuild::TestCases::new();
diff --git a/actix-rt/src/system.rs b/actix-rt/src/system.rs
index 4f262ede..2b44ad6a 100644
--- a/actix-rt/src/system.rs
+++ b/actix-rt/src/system.rs
@@ -155,6 +155,7 @@ impl System {
 pub struct SystemRunner {
     rt: Runtime,
     stop_rx: oneshot::Receiver<i32>,
+    #[allow(dead_code)]
     system: System,
 }
 
diff --git a/actix-server/src/accept.rs b/actix-server/src/accept.rs
index d9451d37..504f452d 100644
--- a/actix-server/src/accept.rs
+++ b/actix-server/src/accept.rs
@@ -81,14 +81,9 @@ struct Accept {
 }
 
 /// Array of u128 with every bit as marker for a worker handle's availability.
+#[derive(Debug, Default)]
 struct Availability([u128; 4]);
 
-impl Default for Availability {
-    fn default() -> Self {
-        Self([0; 4])
-    }
-}
-
 impl Availability {
     /// Check if any worker handle is available
     #[inline(always)]
diff --git a/actix-server/src/worker.rs b/actix-server/src/worker.rs
index b99b2da2..ffe36f61 100644
--- a/actix-server/src/worker.rs
+++ b/actix-server/src/worker.rs
@@ -181,6 +181,7 @@ impl WorkerHandleAccept {
 /// Held by [ServerBuilder](crate::builder::ServerBuilder).
 #[derive(Debug)]
 pub(crate) struct WorkerHandleServer {
+    #[allow(dead_code)]
     idx: usize,
     tx: UnboundedSender<Stop>,
 }
diff --git a/actix-service/examples/clone.rs b/actix-service/examples/clone.rs
new file mode 100644
index 00000000..1f61a648
--- /dev/null
+++ b/actix-service/examples/clone.rs
@@ -0,0 +1,33 @@
+use std::{future::Future, sync::mpsc, time::Duration};
+
+async fn oracle<F, Fut>(f: F) -> (u32, u32)
+where
+    F: FnOnce() -> Fut + Clone + Send + 'static,
+    Fut: Future<Output = u32> + 'static,
+{
+    let f1 = actix_rt::spawn(f.clone()());
+    let f2 = actix_rt::spawn(f());
+
+    (f1.await.unwrap(), f2.await.unwrap())
+}
+
+#[actix_rt::main]
+async fn main() {
+    let (tx, rx) = mpsc::channel();
+
+    let (r1, r2) = oracle({
+        let tx = tx.clone();
+
+        || async move {
+            tx.send(()).unwrap();
+            4 * 4
+        }
+    })
+    .await;
+    assert_eq!(r1, r2);
+
+    tx.send(()).unwrap();
+
+    rx.recv_timeout(Duration::from_millis(100)).unwrap();
+    rx.recv_timeout(Duration::from_millis(100)).unwrap();
+}
diff --git a/actix-service/src/fn_service.rs b/actix-service/src/fn_service.rs
index 8c1a6f51..f83ef81f 100644
--- a/actix-service/src/fn_service.rs
+++ b/actix-service/src/fn_service.rs
@@ -52,9 +52,9 @@ pub fn fn_factory<F, Cfg, Srv, Req, Fut, Err>(
     f: F,
 ) -> FnServiceNoConfig<F, Cfg, Srv, Req, Fut, Err>
 where
-    Srv: Service<Req>,
     F: Fn() -> Fut,
     Fut: Future<Output = Result<Srv, Err>>,
+    Srv: Service<Req>,
 {
     FnServiceNoConfig::new(f)
 }
diff --git a/actix-tls/Cargo.toml b/actix-tls/Cargo.toml
index 00082278..3ac1f296 100755
--- a/actix-tls/Cargo.toml
+++ b/actix-tls/Cargo.toml
@@ -4,9 +4,7 @@ version = "3.0.0-beta.5"
 authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
 description = "TLS acceptor and connector services for Actix ecosystem"
 keywords = ["network", "tls", "ssl", "async", "transport"]
-homepage = "https://actix.rs"
 repository = "https://github.com/actix/actix-net.git"
-documentation = "https://docs.rs/actix-tls"
 categories = ["network-programming", "asynchronous"]
 license = "MIT OR Apache-2.0"
 edition = "2018"
diff --git a/clippy.toml b/clippy.toml
new file mode 100644
index 00000000..f691ea3d
--- /dev/null
+++ b/clippy.toml
@@ -0,0 +1 @@
+msrv = "1.48"