Fix adjacent code

clippy_dev/src/serve.rs

@@ -49,7 +49,7 @@ fn mtime(path: impl AsRef<Path>) -> SystemTime {
             .into_iter()
             .flatten()
             .flatten()
-            .map(|entry| mtime(&entry.path()))
+            .map(|entry| mtime(entry.path()))
             .max()
             .unwrap_or(SystemTime::UNIX_EPOCH)
     } else {

clippy_dev/src/update_lints.rs

@@ -128,7 +128,7 @@ fn generate_lint_files(
     for (lint_group, lints) in Lint::by_lint_group(usable_lints.into_iter().chain(internal_lints)) {
         let content = gen_lint_group_list(&lint_group, lints.iter());
         process_file(
-            &format!("clippy_lints/src/lib.register_{lint_group}.rs"),
+            format!("clippy_lints/src/lib.register_{lint_group}.rs"),
             update_mode,
             &content,
         );

clippy_lints/src/lib.rs

@@ -417,7 +417,7 @@ pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, sess: &Se
 
     let msrv = conf.msrv.as_ref().and_then(|s| {
         parse_msrv(s, None, None).or_else(|| {
-            sess.err(&format!(
+            sess.err(format!(
                 "error reading Clippy's configuration file. `{s}` is not a valid Rust version"
             ));
             None
@@ -433,7 +433,7 @@ fn read_msrv(conf: &Conf, sess: &Session) -> Option<RustcVersion> {
         .and_then(|v| parse_msrv(&v, None, None));
     let clippy_msrv = conf.msrv.as_ref().and_then(|s| {
         parse_msrv(s, None, None).or_else(|| {
-            sess.err(&format!(
+            sess.err(format!(
                 "error reading Clippy's configuration file. `{s}` is not a valid Rust version"
             ));
             None
@@ -444,7 +444,7 @@ fn read_msrv(conf: &Conf, sess: &Session) -> Option<RustcVersion> {
         if let Some(clippy_msrv) = clippy_msrv {
             // if both files have an msrv, let's compare them and emit a warning if they differ
             if clippy_msrv != cargo_msrv {
-                sess.warn(&format!(
+                sess.warn(format!(
                     "the MSRV in `clippy.toml` and `Cargo.toml` differ; using `{clippy_msrv}` from `clippy.toml`"
                 ));
             }
@@ -473,7 +473,7 @@ pub fn read_conf(sess: &Session) -> Conf {
     let TryConf { conf, errors, warnings } = utils::conf::read(&file_name);
     // all conf errors are non-fatal, we just use the default conf in case of error
     for error in errors {
-        sess.err(&format!(
+        sess.err(format!(
             "error reading Clippy's configuration file `{}`: {}",
             file_name.display(),
             format_error(error)

clippy_lints/src/nonstandard_macro_braces.rs

@@ -266,7 +266,7 @@ impl<'de> Deserialize<'de> for MacroMatcher {
                         .iter()
                         .find(|b| b.0 == brace)
                         .map(|(o, c)| ((*o).to_owned(), (*c).to_owned()))
-                        .ok_or_else(|| de::Error::custom(&format!("expected one of `(`, `{{`, `[` found `{brace}`")))?,
+                        .ok_or_else(|| de::Error::custom(format!("expected one of `(`, `{{`, `[` found `{brace}`")))?,
                 })
             }
         }

clippy_utils/src/attrs.rs

@@ -136,7 +136,7 @@ pub fn get_unique_inner_attr(sess: &Session, attrs: &[ast::Attribute], name: &'s
                     .emit();
             },
             ast::AttrStyle::Outer => {
-                sess.span_err(attr.span, &format!("`{name}` cannot be an outer attribute"));
+                sess.span_err(attr.span, format!("`{name}` cannot be an outer attribute"));
             },
         }
     }

clippy_utils/src/lib.rs

@@ -125,7 +125,7 @@ pub fn parse_msrv(msrv: &str, sess: Option<&Session>, span: Option<Span>) -> Opt
         return Some(version);
     } else if let Some(sess) = sess {
         if let Some(span) = span {
-            sess.span_err(span, &format!("`{msrv}` is not a valid Rust version"));
+            sess.span_err(span, format!("`{msrv}` is not a valid Rust version"));
         }
     }
     None

lintcheck/src/main.rs

@@ -345,7 +345,7 @@ impl Crate {
                 clippy_args.push(opt);
             }
         } else {
-            clippy_args.extend(&["-Wclippy::pedantic", "-Wclippy::cargo"])
+            clippy_args.extend(["-Wclippy::pedantic", "-Wclippy::cargo"])
         }
 
         if lint_filter.is_empty() {
@@ -457,15 +457,11 @@ fn build_clippy() {
 /// Read a `lintcheck_crates.toml` file
 fn read_crates(toml_path: &Path) -> (Vec<CrateSource>, RecursiveOptions) {
     let toml_content: String =
-        std::fs::read_to_string(&toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
+        std::fs::read_to_string(toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
     let crate_list: SourceList =
         toml::from_str(&toml_content).unwrap_or_else(|e| panic!("Failed to parse {}: \n{}", toml_path.display(), e));
     // parse the hashmap of the toml file into a list of crates
-    let tomlcrates: Vec<TomlCrate> = crate_list
-        .crates
-        .into_iter()
-        .map(|(_cratename, tomlcrate)| tomlcrate)
-        .collect();
+    let tomlcrates: Vec<TomlCrate> = crate_list.crates.into_values().collect();
 
     // flatten TomlCrates into CrateSources (one TomlCrates may represent several versions of a crate =>
     // multiple Cratesources)
@@ -602,10 +598,10 @@ fn main() {
     ) {
         let shared_target_dir = "target/lintcheck/shared_target_dir";
         // if we get an Err here, the shared target dir probably does simply not exist
-        if let Ok(metadata) = std::fs::metadata(&shared_target_dir) {
+        if let Ok(metadata) = std::fs::metadata(shared_target_dir) {
             if metadata.is_dir() {
                 println!("Clippy is newer than lint check logs, clearing lintcheck shared target dir...");
-                std::fs::remove_dir_all(&shared_target_dir)
+                std::fs::remove_dir_all(shared_target_dir)
                     .expect("failed to remove target/lintcheck/shared_target_dir");
             }
         }
@@ -779,7 +775,7 @@ fn read_stats_from_file(file_path: &Path) -> HashMap<String, usize> {
 fn print_stats(old_stats: HashMap<String, usize>, new_stats: HashMap<&String, usize>, lint_filter: &Vec<String>) {
     let same_in_both_hashmaps = old_stats
         .iter()
-        .filter(|(old_key, old_val)| new_stats.get::<&String>(&old_key) == Some(old_val))
+        .filter(|(old_key, old_val)| new_stats.get::<&String>(old_key) == Some(old_val))
         .map(|(k, v)| (k.to_string(), *v))
         .collect::<Vec<(String, usize)>>();
 
@@ -797,24 +793,24 @@ fn print_stats(old_stats: HashMap<String, usize>, new_stats: HashMap<&String, us
     // list all new counts  (key is in new stats but not in old stats)
     new_stats_deduped
         .iter()
-        .filter(|(new_key, _)| old_stats_deduped.get::<str>(&new_key).is_none())
+        .filter(|(new_key, _)| old_stats_deduped.get::<str>(new_key).is_none())
         .for_each(|(new_key, new_value)| {
             println!("{} 0 => {}", new_key, new_value);
         });
 
     // list all changed counts (key is in both maps but value differs)
     new_stats_deduped
         .iter()
-        .filter(|(new_key, _new_val)| old_stats_deduped.get::<str>(&new_key).is_some())
+        .filter(|(new_key, _new_val)| old_stats_deduped.get::<str>(new_key).is_some())
         .for_each(|(new_key, new_val)| {
-            let old_val = old_stats_deduped.get::<str>(&new_key).unwrap();
+            let old_val = old_stats_deduped.get::<str>(new_key).unwrap();
             println!("{} {} => {}", new_key, old_val, new_val);
         });
 
     // list all gone counts (key is in old status but not in new stats)
     old_stats_deduped
         .iter()
-        .filter(|(old_key, _)| new_stats_deduped.get::<&String>(&old_key).is_none())
+        .filter(|(old_key, _)| new_stats_deduped.get::<&String>(old_key).is_none())
         .filter(|(old_key, _)| lint_filter.is_empty() || lint_filter.contains(old_key))
         .for_each(|(old_key, old_value)| {
             println!("{} {} => 0", old_key, old_value);
@@ -832,12 +828,12 @@ fn create_dirs(krate_download_dir: &Path, extract_dir: &Path) {
             panic!("cannot create lintcheck target dir");
         }
     });
-    std::fs::create_dir(&krate_download_dir).unwrap_or_else(|err| {
+    std::fs::create_dir(krate_download_dir).unwrap_or_else(|err| {
         if err.kind() != ErrorKind::AlreadyExists {
             panic!("cannot create crate download dir");
         }
     });
-    std::fs::create_dir(&extract_dir).unwrap_or_else(|err| {
+    std::fs::create_dir(extract_dir).unwrap_or_else(|err| {
         if err.kind() != ErrorKind::AlreadyExists {
             panic!("cannot create crate extraction dir");
         }
@@ -863,7 +859,7 @@ fn lintcheck_test() {
         "lintcheck/test_sources.toml",
     ];
     let status = std::process::Command::new("cargo")
-        .args(&args)
+        .args(args)
         .current_dir("..") // repo root
         .status();
     //.output();

tests/compile-test.rs

@@ -283,7 +283,7 @@ fn run_ui_cargo() {
                 env::set_current_dir(&src_path)?;
 
                 let cargo_toml_path = case.path().join("Cargo.toml");
-                let cargo_content = fs::read(&cargo_toml_path)?;
+                let cargo_content = fs::read(cargo_toml_path)?;
                 let cargo_parsed: toml::Value = toml::from_str(
                     std::str::from_utf8(&cargo_content).expect("`Cargo.toml` is not a valid utf-8 file!"),
                 )

tests/versioncheck.rs

@@ -48,7 +48,7 @@ fn check_that_clippy_has_the_same_major_version_as_rustc() {
     // `RUSTC_REAL` if Clippy is build in the Rust repo with `./x.py`.
     let rustc = std::env::var("RUSTC_REAL").unwrap_or_else(|_| "rustc".to_string());
     let rustc_version = String::from_utf8(
-        std::process::Command::new(&rustc)
+        std::process::Command::new(rustc)
             .arg("--version")
             .output()
             .expect("failed to run `rustc --version`")