Use captured args in format string (#558)

basics/basics/src/main.rs

@@ -22,12 +22,12 @@ async fn favicon() -> Result<impl Responder> {
 /// simple index handler
 #[get("/welcome")]
 async fn welcome(req: HttpRequest, session: Session) -> Result<HttpResponse> {
-    println!("{:?}", req);
+    println!("{req:?}");
 
     // session
     let mut counter = 1;
     if let Some(count) = session.get::<i32>("counter")? {
-        println!("SESSION value: {}", count);
+        println!("SESSION value: {count}");
         counter = count + 1;
     }
 
@@ -63,7 +63,7 @@ async fn response_body(path: web::Path<String>) -> HttpResponse {
 
 /// handler with path parameters like `/user/{name}/`
 async fn with_param(req: HttpRequest, path: web::Path<(String,)>) -> HttpResponse {
-    println!("{:?}", req);
+    println!("{req:?}");
 
     HttpResponse::Ok()
         .content_type(ContentType::plaintext())
@@ -110,7 +110,7 @@ async fn main() -> io::Result<()> {
             // redirect
             .service(
                 web::resource("/").route(web::get().to(|req: HttpRequest| async move {
-                    println!("{:?}", req);
+                    println!("{req:?}");
                     HttpResponse::Found()
                         .insert_header((header::LOCATION, "static/welcome.html"))
                         .finish()

basics/hello-world/src/main.rs

@@ -1,7 +1,7 @@
 use actix_web::{middleware, web, App, HttpRequest, HttpServer};
 
 async fn index(req: HttpRequest) -> &'static str {
-    println!("REQ: {:?}", req);
+    println!("REQ: {req:?}");
     "Hello world!"
 }
 

basics/state/src/main.rs

@@ -36,7 +36,7 @@ async fn index(
     counter_atomic: Data<AtomicUsize>,
     req: HttpRequest,
 ) -> HttpResponse {
-    println!("{:?}", req);
+    println!("{req:?}");
 
     // Increment the counters
     *counter_mutex.lock().unwrap() += 1;

basics/todo/src/api.rs

@@ -80,7 +80,7 @@ pub async fn update(
         "put" => toggle(db, params).await,
         "delete" => delete(db, params, session).await,
         unsupported_method => {
-            let msg = format!("Unsupported HTTP method: {}", unsupported_method);
+            let msg = format!("Unsupported HTTP method: {unsupported_method}");
             Err(error::ErrorBadRequest(msg))
         }
     }