diff --git a/examples/src/helloworld/server.rs b/examples/src/helloworld/server.rs
index 3a3051c..a57f4b4 100644
--- a/examples/src/helloworld/server.rs
+++ b/examples/src/helloworld/server.rs
@@ -21,7 +21,7 @@ impl Greeter for MyGreeter {
         println!("Got a request from {:?}", request.remote_addr());
 
         let reply = hello_world::HelloReply {
-            message: format!("Hello {}!", request.into_inner().name).into(),
+            message: format!("Hello {}!", request.into_inner().name),
         };
         Ok(Response::new(reply))
     }
diff --git a/examples/src/load_balance/client.rs b/examples/src/load_balance/client.rs
index 169546c..eac0b5f 100644
--- a/examples/src/load_balance/client.rs
+++ b/examples/src/load_balance/client.rs
@@ -8,7 +8,7 @@ use tonic::transport::Channel;
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let endpoints = ["http://[::1]:50051", "http://[::1]:50052"]
-        .into_iter()
+        .iter()
         .map(|a| Channel::from_static(a));
 
     let channel = Channel::balance_list(endpoints);
diff --git a/examples/src/multiplex/server.rs b/examples/src/multiplex/server.rs
index c10575d..4af338b 100644
--- a/examples/src/multiplex/server.rs
+++ b/examples/src/multiplex/server.rs
@@ -48,7 +48,7 @@ impl Greeter for MyGreeter {
         request: Request<HelloRequest>,
     ) -> Result<Response<HelloReply>, Status> {
         let reply = hello_world::HelloReply {
-            message: format!("Hello {}!", request.into_inner().name).into(),
+            message: format!("Hello {}!", request.into_inner().name),
         };
         Ok(Response::new(reply))
     }
diff --git a/examples/src/routeguide/client.rs b/examples/src/routeguide/client.rs
index b549e27..cb43440 100644
--- a/examples/src/routeguide/client.rs
+++ b/examples/src/routeguide/client.rs
@@ -17,12 +17,12 @@ use route_guide::routeguide_client::RouteGuideClient;
 async fn print_features(client: &mut RouteGuideClient<Channel>) -> Result<(), Box<dyn Error>> {
     let rectangle = Rectangle {
         lo: Some(Point {
-            latitude: 400000000,
-            longitude: -750000000,
+            latitude: 400_000_000,
+            longitude: -750_000_000,
         }),
         hi: Some(Point {
-            latitude: 420000000,
-            longitude: -730000000,
+            latitude: 420_000_000,
+            longitude: -730_000_000,
         }),
     };
 
@@ -96,8 +96,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("*** SIMPLE RPC ***");
     let response = client
         .get_feature(Request::new(Point {
-            latitude: 409146138,
-            longitude: -746188906,
+            latitude: 409_146_138,
+            longitude: -746_188_906,
         }))
         .await?;
     println!("RESPONSE = {:?}", response);
diff --git a/examples/src/routeguide/server.rs b/examples/src/routeguide/server.rs
index f766957..097f103 100644
--- a/examples/src/routeguide/server.rs
+++ b/examples/src/routeguide/server.rs
@@ -195,7 +195,7 @@ fn in_range(point: &Point, rect: &Rectangle) -> bool {
 /// This code was taken from http://www.movable-type.co.uk/scripts/latlong.html.
 fn calc_distance(p1: &Point, p2: &Point) -> i32 {
     const CORD_FACTOR: f64 = 1e7;
-    const R: f64 = 6371000.0; // meters
+    const R: f64 = 6_371_000.0; // meters
 
     let lat1 = p1.latitude as f64 / CORD_FACTOR;
     let lat2 = p2.latitude as f64 / CORD_FACTOR;
diff --git a/examples/src/tracing/server.rs b/examples/src/tracing/server.rs
index cc078d7..787f5c5 100644
--- a/examples/src/tracing/server.rs
+++ b/examples/src/tracing/server.rs
@@ -21,7 +21,7 @@ impl Greeter for MyGreeter {
         tracing::info!(message = "Inbound request.", metadata = ?request.metadata());
 
         let reply = hello_world::HelloReply {
-            message: format!("Hello {}!", request.into_inner().name).into(),
+            message: format!("Hello {}!", request.into_inner().name),
         };
 
         tracing::debug!(message = "Sending reply.", response = %reply.message);
diff --git a/examples/src/uds/server.rs b/examples/src/uds/server.rs
index 1032055..99729ad 100644
--- a/examples/src/uds/server.rs
+++ b/examples/src/uds/server.rs
@@ -34,7 +34,7 @@ impl Greeter for MyGreeter {
         println!("Got a request: {:?}", request);
 
         let reply = hello_world::HelloReply {
-            message: format!("Hello {}!", request.into_inner().name).into(),
+            message: format!("Hello {}!", request.into_inner().name),
         };
         Ok(Response::new(reply))
     }
diff --git a/interop/src/client.rs b/interop/src/client.rs
index b75da6e..277edeb 100644
--- a/interop/src/client.rs
+++ b/interop/src/client.rs
@@ -10,12 +10,12 @@ use tonic::{metadata::MetadataValue, Code, Request, Response, Status};
 pub type TestClient = TestServiceClient<Channel>;
 pub type UnimplementedClient = UnimplementedServiceClient<Channel>;
 
-const LARGE_REQ_SIZE: usize = 271828;
-const LARGE_RSP_SIZE: i32 = 314159;
-const REQUEST_LENGTHS: &'static [i32] = &[27182, 8, 1828, 45904];
-const RESPONSE_LENGTHS: &'static [i32] = &[31415, 9, 2653, 58979];
-const TEST_STATUS_MESSAGE: &'static str = "test status message";
-const SPECIAL_TEST_STATUS_MESSAGE: &'static str =
+const LARGE_REQ_SIZE: usize = 271_828;
+const LARGE_RSP_SIZE: i32 = 314_159;
+const REQUEST_LENGTHS: &[i32] = &[27182, 8, 1828, 45904];
+const RESPONSE_LENGTHS: &[i32] = &[31415, 9, 2653, 58979];
+const TEST_STATUS_MESSAGE: &str = "test status message";
+const SPECIAL_TEST_STATUS_MESSAGE: &str =
     "\t\ntest with whitespace\r\nand Unicode BMP ☺ and non-BMP 😈\t\n";
 
 pub async fn empty_unary(client: &mut TestClient, assertions: &mut Vec<TestAssertion>) {
@@ -217,7 +217,7 @@ pub async fn empty_stream(client: &mut TestClient, assertions: &mut Vec<TestAsse
 
         assertions.push(test_assert!(
             "there should be no responses",
-            responses.len() == 0,
+            responses.is_empty(),
             format!("responses.len()={:?}", responses.len())
         ));
     }