diff --git a/enums/src/macros.rs b/enums/src/macros.rs
index da8dcc1d8..2842b1cba 100644
--- a/enums/src/macros.rs
+++ b/enums/src/macros.rs
@@ -1,4 +1,3 @@
-#[macro_use]
 macro_rules! mk_enum {
     ( $( $camel:ident ),* ) => {
         #[derive(Clone, Debug, IntoEnumIterator, PartialEq)]
@@ -10,7 +9,6 @@ macro_rules! mk_enum {
     };
 }
 
-#[macro_use]
 macro_rules! mk_get_language {
     ( $( ($camel:ident, $name:ident) ),* ) => {
         pub fn get_language(lang: &Lang) -> Language {
@@ -30,7 +28,6 @@ macro_rules! mk_get_language {
     };
 }
 
-#[macro_use]
 macro_rules! mk_get_language_name {
     ( $( $camel:ident ),* ) => {
         pub fn get_language_name(lang: &Lang) -> &'static str {
@@ -43,7 +40,6 @@ macro_rules! mk_get_language_name {
     };
 }
 
-#[macro_use]
 macro_rules! mk_langs {
     ( $( ($camel:ident, $name:ident) ),* ) => {
         mk_enum!($( $camel ),*);
diff --git a/enums/src/main.rs b/enums/src/main.rs
index cd84abb6e..01aa1476f 100644
--- a/enums/src/main.rs
+++ b/enums/src/main.rs
@@ -45,17 +45,17 @@ fn main() {
 
     match language {
         "rust" => {
-            if let Some(err) = generate_rust(&output, &file_template).err() {
+            if let Some(err) = generate_rust(output, file_template).err() {
                 eprintln!("{:?}", err);
             }
         }
         "go" => {
-            if let Some(err) = generate_go(&output, &file_template).err() {
+            if let Some(err) = generate_go(output, file_template).err() {
                 eprintln!("{:?}", err);
             }
         }
         "json" => {
-            if let Some(err) = generate_json(&output, &file_template).err() {
+            if let Some(err) = generate_json(output, file_template).err() {
                 eprintln!("{:?}", err);
             }
         }
diff --git a/rust-code-analysis-cli/src/main.rs b/rust-code-analysis-cli/src/main.rs
index b9c0bd472..a8f32b1fe 100644
--- a/rust-code-analysis-cli/src/main.rs
+++ b/rust-code-analysis-cli/src/main.rs
@@ -236,14 +236,14 @@ fn explore(
                         };
                     }
 
-                    send_file(path, &cfg, language, &sender);
+                    send_file(path, cfg, language, sender);
                 }
             }
         } else if (include.is_empty() || include.is_match(&path))
             && (exclude.is_empty() || !exclude.is_match(&path))
             && path.is_file()
         {
-            send_file(path, &cfg, language, &sender);
+            send_file(path, cfg, language, sender);
         }
     }
 
diff --git a/src/asttools.rs b/src/asttools.rs
index 1b446c80d..53a680669 100644
--- a/src/asttools.rs
+++ b/src/asttools.rs
@@ -16,7 +16,6 @@ pub fn get_parent<'a>(node: &'a Node<'a>, level: usize) -> Option<Node<'a>> {
     Some(node)
 }
 
-#[macro_use]
 macro_rules! has_ancestors {
     ($node:expr, $( $typs:pat )|*, $( $typ:pat ),+) => {{
         let mut res = false;
@@ -54,7 +53,6 @@ macro_rules! has_ancestors {
     }};
 }
 
-#[macro_use]
 macro_rules! count_specific_ancestors {
     ($node:expr, $( $typs:pat )|*, $( $stops:pat )|*) => {{
         let mut count = 0;
diff --git a/src/languages/mod.rs b/src/languages/mod.rs
index 8073d95b6..46da5780d 100644
--- a/src/languages/mod.rs
+++ b/src/languages/mod.rs
@@ -1,3 +1,7 @@
+// FIXME: this should be fixed in some way to avoid useless allocations
+#![allow(clippy::cmp_owned)]
+#![allow(clippy::enum_variant_names)]
+
 pub mod language_ccomment;
 pub use language_ccomment::*;
 
diff --git a/src/macros.rs b/src/macros.rs
index 375ea71e1..ada6515c2 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -1,4 +1,3 @@
-#[macro_use]
 macro_rules! mk_checker {
     ( $name:ident, $( $type:ident ),* ) => {
         #[inline(always)]
@@ -13,7 +12,6 @@ macro_rules! mk_checker {
     };
 }
 
-#[macro_use]
 macro_rules! mk_else_if {
     ($if_type:ident) => {
         #[inline(always)]
@@ -30,7 +28,6 @@ macro_rules! mk_else_if {
     };
 }
 
-#[macro_use]
 macro_rules! get_language {
     (tree_sitter_cpp) => {
         tree_sitter_mozcpp::language()
@@ -46,7 +43,6 @@ macro_rules! get_language {
     };
 }
 
-#[macro_use]
 macro_rules! mk_enum {
     ( $( $camel:ident, $description:expr ),* ) => {
         /// The list of supported languages.
@@ -60,7 +56,6 @@ macro_rules! mk_enum {
     };
 }
 
-#[macro_use]
 macro_rules! mk_impl_lang {
     ( $( ($camel:ident, $name:ident, $display: expr) ),* ) => {
         impl LANG {
@@ -85,7 +80,6 @@ macro_rules! mk_impl_lang {
     };
 }
 
-#[macro_use]
 macro_rules! mk_action {
     ( $( ($camel:ident, $parser:ident) ),* ) => {
         /// Runs a function, which implements the [`Callback`] trait,
@@ -161,7 +155,6 @@ macro_rules! mk_action {
     };
 }
 
-#[macro_use]
 macro_rules! mk_extensions {
     ( $( ($camel:ident, [ $( $ext:ident ),* ]) ),* ) => {
         /// Detects the language associated to the input file extension.
@@ -188,7 +181,6 @@ macro_rules! mk_extensions {
     };
 }
 
-#[macro_use]
 macro_rules! mk_emacs_mode {
     ( $( ($camel:ident, [ $( $emacs_mode:expr ),* ]) ),* ) => {
         /// Detects the language associated to the input `Emacs` mode.
@@ -218,7 +210,6 @@ macro_rules! mk_emacs_mode {
     };
 }
 
-#[macro_use]
 macro_rules! mk_code {
     ( $( ($camel:ident, $code:ident, $parser:ident, $name:ident, $docname:expr) ),* ) => {
         $(
@@ -249,7 +240,6 @@ macro_rules! mk_code {
     };
 }
 
-#[macro_use]
 macro_rules! mk_langs {
     ( $( ($camel:ident, $description: expr, $display: expr, $code:ident, $parser:ident, $name:ident, [ $( $ext:ident ),* ], [ $( $emacs_mode:expr ),* ]) ),* ) => {
         mk_enum!($( $camel, $description ),*);
@@ -261,7 +251,6 @@ macro_rules! mk_langs {
     };
 }
 
-#[macro_use]
 macro_rules! color {
     ( $stdout: ident, $color: ident) => {
         $stdout.set_color(ColorSpec::new().set_fg(Some(Color::$color)))?;
@@ -276,7 +265,6 @@ macro_rules! color {
 }
 
 #[cfg(test)]
-#[macro_use]
 macro_rules! check_metrics {
     ($source: expr, $file: expr, $parser: ident, $metric: ident,
      [ $( ( $func_int: ident, $true_int_value: expr $(,$type_int: ty)? )$(,)* )* ]$(,)*
diff --git a/src/metrics/cognitive.rs b/src/metrics/cognitive.rs
index d671783af..096c61259 100644
--- a/src/metrics/cognitive.rs
+++ b/src/metrics/cognitive.rs
@@ -252,7 +252,7 @@ impl Cognitive for RustCode {
         match node.object().kind_id().into() {
             IfExpression | IfLetExpression => {
                 // Check if a node is not an else-if
-                if !Self::is_else_if(&node) {
+                if !Self::is_else_if(node) {
                     nesting_levels!(
                         node, stats,
                         [FunctionItem => SourceFile],
@@ -298,7 +298,7 @@ impl Cognitive for CppCode {
 
         match node.object().kind_id().into() {
             IfStatement => {
-                if !Self::is_else_if(&node) {
+                if !Self::is_else_if(node) {
                     nesting_levels!(
                         node, stats,
                         [LambdaExpression => TranslationUnit],
diff --git a/src/metrics/halstead.rs b/src/metrics/halstead.rs
index 459105251..ea42fb7ee 100644
--- a/src/metrics/halstead.rs
+++ b/src/metrics/halstead.rs
@@ -266,7 +266,7 @@ fn compute_halstead<'a, T: Getter>(
     code: &'a [u8],
     halstead_maps: &mut HalsteadMaps<'a>,
 ) {
-    match T::get_op_type(&node) {
+    match T::get_op_type(node) {
         HalsteadType::Operator => {
             *halstead_maps
                 .operators
diff --git a/src/output/dump.rs b/src/output/dump.rs
index aaea93ce7..0430ee053 100644
--- a/src/output/dump.rs
+++ b/src/output/dump.rs
@@ -43,8 +43,8 @@ pub fn dump_node(
     let stdout = StandardStream::stdout(ColorChoice::Always);
     let mut stdout = stdout.lock();
     let ret = dump_tree_helper(
-        &code,
-        &node,
+        code,
+        node,
         "",
         true,
         &mut stdout,
@@ -136,7 +136,7 @@ fn dump_tree_helper(
         loop {
             i -= 1;
             dump_tree_helper(
-                &code,
+                code,
                 &Node::new(cursor.node()),
                 &prefix,
                 i == 0,
@@ -178,7 +178,7 @@ impl Callback for Dump {
 
     fn call<T: ParserTrait>(cfg: Self::Cfg, parser: &T) -> Self::Res {
         dump_node(
-            &parser.get_code(),
+            parser.get_code(),
             &parser.get_root(),
             -1,
             cfg.line_start,
diff --git a/src/output/dump_metrics.rs b/src/output/dump_metrics.rs
index 92e9a1a6f..286c13281 100644
--- a/src/output/dump_metrics.rs
+++ b/src/output/dump_metrics.rs
@@ -43,7 +43,7 @@ use crate::spaces::{CodeMetrics, FuncSpace};
 pub fn dump_root(space: &FuncSpace) -> std::io::Result<()> {
     let stdout = StandardStream::stdout(ColorChoice::Always);
     let mut stdout = stdout.lock();
-    dump_space(&space, "", true, &mut stdout)?;
+    dump_space(space, "", true, &mut stdout)?;
     color!(stdout, White);
 
     Ok(())
@@ -64,7 +64,7 @@ fn dump_space(
     write!(stdout, "{}: ", space.kind)?;
 
     color!(stdout, Cyan, true);
-    write!(stdout, "{}", space.name.as_ref().map_or("", |name| &name))?;
+    write!(stdout, "{}", space.name.as_ref().map_or("", |name| name))?;
 
     color!(stdout, Red, true);
     writeln!(stdout, " (@{})", space.start_line)?;
diff --git a/src/preproc.rs b/src/preproc.rs
index 07e428d5d..29cffe0c5 100644
--- a/src/preproc.rs
+++ b/src/preproc.rs
@@ -86,7 +86,7 @@ pub fn fix_includes<S: ::std::hash::BuildHasher>(
         };
         let direct_includes = &pf.direct_includes;
         for i in direct_includes {
-            let possibilities = guess_file(&file, i, all_files);
+            let possibilities = guess_file(file, i, all_files);
             for i in possibilities {
                 if &i != file {
                     let i = match nodes.entry(i.clone()) {
@@ -213,7 +213,7 @@ pub fn preprocess(parser: &PreprocParser, path: &Path, results: &mut PreprocResu
                 let identifier = cursor.node();
 
                 if identifier.kind_id() == Preproc::Identifier {
-                    let r#macro = identifier.utf8_text(&code).unwrap();
+                    let r#macro = identifier.utf8_text(code).unwrap();
                     if !SPECIALS.contains(r#macro) {
                         file_result.macros.insert(r#macro.to_string());
                     }
diff --git a/src/spaces.rs b/src/spaces.rs
index eada6d78a..26601e88f 100644
--- a/src/spaces.rs
+++ b/src/spaces.rs
@@ -156,7 +156,7 @@ impl FuncSpace {
             ),
         };
         Self {
-            name: T::get_func_space_name(&node, code).map(|name| name.to_string()),
+            name: T::get_func_space_name(node, code).map(|name| name.to_string()),
             spaces: Vec::new(),
             metrics: CodeMetrics::default(),
             kind,
diff --git a/src/tools.rs b/src/tools.rs
index 8238af30a..df45342f7 100644
--- a/src/tools.rs
+++ b/src/tools.rs
@@ -65,7 +65,7 @@ pub fn read_file_with_eol(path: &Path) -> std::io::Result<Option<Vec<u8>>> {
     };
 
     // so start contains more or less 64 chars
-    let mut head = String::from_utf8_lossy(&start).into_owned();
+    let mut head = String::from_utf8_lossy(start).into_owned();
     // The last char could be wrong because we were in the middle of an utf-8 sequence
     head.pop();
     // now check if there is an invalid char
@@ -74,7 +74,7 @@ pub fn read_file_with_eol(path: &Path) -> std::io::Result<Option<Vec<u8>>> {
     }
 
     let mut data = Vec::with_capacity(file_size + 2);
-    data.extend_from_slice(&start);
+    data.extend_from_slice(start);
 
     file.read_to_end(&mut data)?;
 
@@ -327,7 +327,7 @@ pub(crate) fn guess_file<S: ::std::hash::BuildHasher>(
             if current_path == p {
                 continue;
             }
-            if let Some(dist) = get_paths_dist(current_path, &p) {
+            if let Some(dist) = get_paths_dist(current_path, p) {
                 match dist.cmp(&dist_min) {
                     Ordering::Less => {
                         dist_min = dist;