chore: clippy lints (#467)

* chore: clippy lints

examples/src/gcp/client.rs

@@ -18,9 +18,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     })?;
 
     let project = std::env::args()
-        .skip(1)
-        .next()
-        .ok_or("Expected a project name as the first argument.".to_string())?;
+        .nth(1)
+        .ok_or_else(|| "Expected a project name as the first argument.".to_string())?;
 
     let bearer_token = format!("Bearer {}", token);
     let header_value = MetadataValue::from_str(&bearer_token)?;

examples/src/hyper_warp/server.rs

@@ -48,12 +48,11 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("GreeterServer listening on {}", addr);
 
     let tonic = GreeterServer::new(greeter);
-    let warp = warp::service(warp::path("hello").map(|| "hello, world!"));
+    let mut warp = warp::service(warp::path("hello").map(|| "hello, world!"));
 
     Server::bind(&addr)
         .serve(make_service_fn(move |_| {
             let mut tonic = tonic.clone();
-            let mut warp = warp.clone();
             future::ok::<_, Infallible>(tower::service_fn(
                 move |req: hyper::Request<hyper::Body>| match req.version() {
                     Version::HTTP_11 | Version::HTTP_10 => Either::Left(

examples/src/hyper_warp_multiplex/server.rs

@@ -96,9 +96,7 @@ impl Echo for MyEcho {
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let addr = "[::1]:50051".parse().unwrap();
 
-    //println!("GreeterServer listening on {}", addr);
-
-    let warp = warp::service(warp::path("hello").map(|| "hello, world!"));
+    let mut warp = warp::service(warp::path("hello").map(|| "hello, world!"));
 
     Server::bind(&addr)
         .serve(make_service_fn(move |_| {
@@ -110,7 +108,6 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                 .add_service(echo)
                 .into_service();
 
-            let mut warp = warp.clone();
             future::ok::<_, Infallible>(tower::service_fn(
                 move |req: hyper::Request<hyper::Body>| match req.version() {
                     Version::HTTP_11 | Version::HTTP_10 => Either::Left(

examples/src/routeguide/server.rs

@@ -1,5 +1,4 @@
 use std::collections::HashMap;
-use std::hash::{Hash, Hasher};
 use std::pin::Pin;
 use std::sync::Arc;
 use std::time::Instant;
@@ -150,17 +149,6 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
-// Implement hash for Point
-impl Hash for Point {
-    fn hash<H>(&self, state: &mut H)
-    where
-        H: Hasher,
-    {
-        self.latitude.hash(state);
-        self.longitude.hash(state);
-    }
-}
-
 impl Eq for Point {}
 
 fn in_range(point: &Point, rect: &Rectangle) -> bool {