Use implicit format-args captures where applicable (#1709)

axum-macros/src/attr_parsing.rs

@@ -20,7 +20,7 @@ where
 
     if out.is_some() {
         let kw_name = std::any::type_name::<K>().split("::").last().unwrap();
-        let msg = format!("`{}` specified more than once", kw_name);
+        let msg = format!("`{kw_name}` specified more than once");
         return Err(syn::Error::new_spanned(kw, msg));
     }
 
@@ -43,7 +43,7 @@ where
 
     if out.is_some() {
         let kw_name = std::any::type_name::<K>().split("::").last().unwrap();
-        let msg = format!("`{}` specified more than once", kw_name);
+        let msg = format!("`{kw_name}` specified more than once");
         return Err(syn::Error::new_spanned(kw, msg));
     }
 
@@ -74,7 +74,7 @@ where
     if let Some((kw, inner)) = b {
         if a.is_some() {
             let kw_name = std::any::type_name::<K>().split("::").last().unwrap();
-            let msg = format!("`{}` specified more than once", kw_name);
+            let msg = format!("`{kw_name}` specified more than once");
             return Err(syn::Error::new_spanned(kw, msg));
         }
         *a = Some((kw, inner));
@@ -89,7 +89,7 @@ where
     if let Some(kw) = b {
         if a.is_some() {
             let kw_name = std::any::type_name::<K>().split("::").last().unwrap();
-            let msg = format!("`{}` specified more than once", kw_name);
+            let msg = format!("`{kw_name}` specified more than once");
             return Err(syn::Error::new_spanned(kw, msg));
         }
         *a = Some(kw);

axum-macros/src/debug_handler.rs

@@ -111,9 +111,8 @@ fn check_extractor_count(item_fn: &ItemFn) -> Option<TokenStream> {
         None
     } else {
         let error_message = format!(
-            "Handlers cannot take more than {} arguments. \
+            "Handlers cannot take more than {max_extractors} arguments. \
             Use `(a, b): (ExtractorA, ExtractorA)` to further nest extractors",
-            max_extractors,
         );
         let error = syn::Error::new_spanned(&item_fn.sig.inputs, error_message).to_compile_error();
         Some(error)

axum-macros/src/lib.rs

@@ -665,7 +665,7 @@ where
         Ok(tokens) => {
             let tokens = (quote! { #tokens }).into();
             if std::env::var_os("AXUM_MACROS_DEBUG").is_some() {
-                eprintln!("{}", tokens);
+                eprintln!("{tokens}");
             }
             tokens
         }
@@ -722,7 +722,7 @@ fn run_ui_tests(directory: &str) {
                 path = path_without_prefix.to_owned();
             }
 
-            if !path.contains(&format!("/{}/", directory)) {
+            if !path.contains(&format!("/{directory}/")) {
                 return;
             }
 
@@ -734,8 +734,8 @@ fn run_ui_tests(directory: &str) {
                 panic!()
             }
         } else {
-            t.compile_fail(format!("tests/{}/fail/*.rs", directory));
-            t.pass(format!("tests/{}/pass/*.rs", directory));
+            t.compile_fail(format!("tests/{directory}/fail/*.rs"));
+            t.pass(format!("tests/{directory}/pass/*.rs"));
         }
     }
 

axum-macros/src/typed_path.rs

@@ -267,9 +267,9 @@ fn expand_unnamed_fields(
 
 fn simple_pluralize(count: usize, word: &str) -> String {
     if count == 1 {
-        format!("{} {}", count, word)
+        format!("{count} {word}")
     } else {
-        format!("{} {}s", count, word)
+        format!("{count} {word}s")
     }
 }
 
@@ -354,7 +354,7 @@ fn format_str_from_path(segments: &[Segment]) -> String {
     segments
         .iter()
         .map(|segment| match segment {
-            Segment::Capture(capture, _) => format!("{{{}}}", capture),
+            Segment::Capture(capture, _) => format!("{{{capture}}}"),
             Segment::Static(segment) => segment.to_owned(),
         })
         .collect::<Vec<_>>()