diff --git a/benchmarks/benches/formatting.rs b/benchmarks/benches/formatting.rs
index 3479029f4..25d162411 100644
--- a/benchmarks/benches/formatting.rs
+++ b/benchmarks/benches/formatting.rs
@@ -55,7 +55,7 @@ fn bench_formatting(c: &mut criterion::Criterion) {
             group.bench_function(conf.name, |b| {
                 b.iter(|| {
                     let mut matcher = conf.matching_words.build(conf.text);
-                    matcher.format(option.clone());
+                    matcher.format(*option);
                 })
             });
         }
diff --git a/benchmarks/benches/indexing.rs b/benchmarks/benches/indexing.rs
index d567b3da1..9446c0b0f 100644
--- a/benchmarks/benches/indexing.rs
+++ b/benchmarks/benches/indexing.rs
@@ -30,7 +30,7 @@ fn setup_dir(path: impl AsRef<Path>) {
 
 fn setup_index() -> Index {
     let path = "benches.mmdb";
-    setup_dir(&path);
+    setup_dir(path);
     let mut options = EnvOpenOptions::new();
     options.map_size(100 * 1024 * 1024 * 1024); // 100 GB
     options.max_readers(10);
@@ -62,7 +62,7 @@ fn setup_settings<'t>(
     builder.execute(|_| (), || false).unwrap();
 }
 
-fn setup_index_with_settings<'t>(
+fn setup_index_with_settings(
     primary_key: &str,
     searchable_fields: &[&str],
     filterable_fields: &[&str],
@@ -121,7 +121,7 @@ fn indexing_songs_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -166,7 +166,7 @@ fn reindexing_songs_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -232,7 +232,7 @@ fn deleting_songs_in_batches_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -295,7 +295,7 @@ fn indexing_songs_in_three_batches_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -377,7 +377,7 @@ fn indexing_songs_without_faceted_numbers(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -422,7 +422,7 @@ fn indexing_songs_without_faceted_fields(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -466,7 +466,7 @@ fn indexing_wiki(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -511,7 +511,7 @@ fn reindexing_wiki(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -578,7 +578,7 @@ fn deleting_wiki_in_batches_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -641,7 +641,7 @@ fn indexing_wiki_in_three_batches(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -732,7 +732,7 @@ fn indexing_movies_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -776,7 +776,7 @@ fn reindexing_movies_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -841,7 +841,7 @@ fn deleting_movies_in_batches_default(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -903,7 +903,7 @@ fn indexing_movies_in_three_batches(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -1011,7 +1011,7 @@ fn indexing_nested_movies_default(c: &mut Criterion) {
                 let sortable_fields = ["popularity", "runtime", "vote_average", "release_date"];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -1078,7 +1078,7 @@ fn deleting_nested_movies_in_batches_default(c: &mut Criterion) {
                 let sortable_fields = ["popularity", "runtime", "vote_average", "release_date"];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -1148,7 +1148,7 @@ fn indexing_nested_movies_without_faceted_fields(c: &mut Criterion) {
                 let sortable_fields = [];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -1192,7 +1192,7 @@ fn indexing_geo(c: &mut Criterion) {
                 let sortable_fields = ["_geo", "population", "elevation"];
 
                 setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -1237,7 +1237,7 @@ fn reindexing_geo(c: &mut Criterion) {
                 let sortable_fields = ["_geo", "population", "elevation"];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
@@ -1304,7 +1304,7 @@ fn deleting_geo_in_batches_default(c: &mut Criterion) {
                 let sortable_fields = ["_geo", "population", "elevation"];
 
                 let index = setup_index_with_settings(
-                    &primary_key,
+                    primary_key,
                     &searchable_fields,
                     &filterable_fields,
                     &sortable_fields,
diff --git a/benchmarks/benches/utils.rs b/benchmarks/benches/utils.rs
index 470d2030d..c2119a4bb 100644
--- a/benchmarks/benches/utils.rs
+++ b/benchmarks/benches/utils.rs
@@ -56,12 +56,12 @@ impl Conf<'_> {
 }
 
 pub fn base_setup(conf: &Conf) -> Index {
-    match remove_dir_all(&conf.database_name) {
+    match remove_dir_all(conf.database_name) {
         Ok(_) => (),
         Err(e) if e.kind() == std::io::ErrorKind::NotFound => (),
         Err(e) => panic!("{}", e),
     }
-    create_dir_all(&conf.database_name).unwrap();
+    create_dir_all(conf.database_name).unwrap();
 
     let mut options = EnvOpenOptions::new();
     options.map_size(100 * 1024 * 1024 * 1024); // 100 GB
@@ -142,7 +142,7 @@ pub fn run_benches(c: &mut criterion::Criterion, confs: &[Conf]) {
 
 pub fn documents_from(filename: &str, filetype: &str) -> DocumentsBatchReader<impl BufRead + Seek> {
     let reader =
-        File::open(filename).expect(&format!("could not find the dataset in: {}", filename));
+        File::open(filename).unwrap_or_else(|_| panic!("could not find the dataset in: {}", filename));
     let reader = BufReader::new(reader);
     let documents = match filetype {
         "csv" => documents_from_csv(reader).unwrap(),
diff --git a/filter-parser/src/lib.rs b/filter-parser/src/lib.rs
index d10136ace..04037d061 100644
--- a/filter-parser/src/lib.rs
+++ b/filter-parser/src/lib.rs
@@ -398,7 +398,7 @@ pub mod tests {
     /// Create a raw [Token]. You must specify the string that appear BEFORE your element followed by your element
     pub fn rtok<'a>(before: &'a str, value: &'a str) -> Token<'a> {
         // if the string is empty we still need to return 1 for the line number
-        let lines = before.is_empty().then(|| 1).unwrap_or_else(|| before.lines().count());
+        let lines = before.is_empty().then_some(1).unwrap_or_else(|| before.lines().count());
         let offset = before.chars().count();
         // the extra field is not checked in the tests so we can set it to nothing
         unsafe { Span::new_from_raw_offset(offset, lines as u32, value, "") }.into()
diff --git a/milli/src/index.rs b/milli/src/index.rs
index 46f8eb6a3..3f7ef14e6 100644
--- a/milli/src/index.rs
+++ b/milli/src/index.rs
@@ -1297,7 +1297,7 @@ pub(crate) mod tests {
         pub fn delete_document(&self, external_document_id: &str) {
             let mut wtxn = self.write_txn().unwrap();
 
-            let mut delete = DeleteDocuments::new(&mut wtxn, &self).unwrap();
+            let mut delete = DeleteDocuments::new(&mut wtxn, self).unwrap();
             delete.strategy(self.index_documents_config.deletion_strategy);
 
             delete.delete_external_id(external_document_id);
diff --git a/milli/src/search/criteria/mod.rs b/milli/src/search/criteria/mod.rs
index 0a5bfd664..06fba1a1b 100644
--- a/milli/src/search/criteria/mod.rs
+++ b/milli/src/search/criteria/mod.rs
@@ -964,7 +964,7 @@ pub mod test {
             let mut docid_words = HashMap::new();
             for (word, docids) in word_docids.iter() {
                 for docid in docids {
-                    let words = docid_words.entry(docid).or_insert(vec![]);
+                    let words: &mut Vec<_> = docid_words.entry(docid).or_default();
                     words.push(word.clone());
                 }
             }
@@ -996,9 +996,8 @@ pub mod test {
                             } else {
                                 (s(lword), s(rword), (lposition - rposition + 1) as i32)
                             };
-                            let docids = word_pair_proximity_docids
-                                .entry(key)
-                                .or_insert(RoaringBitmap::new());
+                            let docids: &mut RoaringBitmap =
+                                word_pair_proximity_docids.entry(key).or_default();
                             docids.push(candidate);
                         }
                     }
@@ -1015,15 +1014,13 @@ pub mod test {
                                 docid_words.iter().position(|w| w.starts_with(pword)).unwrap();
                             if lposition < rposition {
                                 let key = (s(lword), s(pword), (rposition - lposition) as i32);
-                                let docids = word_prefix_pair_proximity_docids
-                                    .entry(key)
-                                    .or_insert(RoaringBitmap::new());
+                                let docids: &mut RoaringBitmap =
+                                    word_prefix_pair_proximity_docids.entry(key).or_default();
                                 docids.push(candidate);
                             } else {
                                 let key = (s(lword), s(pword), (lposition - rposition) as i32);
-                                let docids = prefix_word_pair_proximity_docids
-                                    .entry(key)
-                                    .or_insert(RoaringBitmap::new());
+                                let docids: &mut RoaringBitmap =
+                                    prefix_word_pair_proximity_docids.entry(key).or_default();
                                 docids.push(candidate);
                             };
                         }
diff --git a/milli/src/search/criteria/typo.rs b/milli/src/search/criteria/typo.rs
index 20bc718fd..1792e4579 100644
--- a/milli/src/search/criteria/typo.rs
+++ b/milli/src/search/criteria/typo.rs
@@ -426,7 +426,7 @@ mod test {
         let parent = Initial::<NoopDistinct>::new(
             &context,
             query_tree,
-            Some(facet_candidates.clone()),
+            Some(facet_candidates),
             false,
             None,
         );
@@ -469,7 +469,7 @@ mod test {
         let parent = Initial::<NoopDistinct>::new(
             &context,
             Some(query_tree),
-            Some(facet_candidates.clone()),
+            Some(facet_candidates),
             false,
             None,
         );
diff --git a/milli/src/search/distinct/mod.rs b/milli/src/search/distinct/mod.rs
index 3a46bb469..12374c1f5 100644
--- a/milli/src/search/distinct/mod.rs
+++ b/milli/src/search/distinct/mod.rs
@@ -113,7 +113,7 @@ mod test {
         let fid = fields_map.id(distinct).unwrap();
 
         let documents = DocumentsBatchReader::from_reader(Cursor::new(JSON.as_slice())).unwrap();
-        let map = (0..documents.documents_count() as u32).collect();
+        let map = (0..documents.documents_count()).collect();
 
         txn.commit().unwrap();
 
diff --git a/milli/src/search/facet/facet_distribution_iter.rs b/milli/src/search/facet/facet_distribution_iter.rs
index 6e209c7aa..bb3c75343 100644
--- a/milli/src/search/facet/facet_distribution_iter.rs
+++ b/milli/src/search/facet/facet_distribution_iter.rs
@@ -177,11 +177,10 @@ mod tests {
                 |facet, count, _| {
                     let facet = OrderedF64Codec::bytes_decode(facet).unwrap();
                     if nbr_facets == 100 {
-                        return Ok(ControlFlow::Break(()));
+                        Ok(ControlFlow::Break(()))
                     } else {
                         nbr_facets += 1;
                         results.push_str(&format!("{facet}: {count}\n"));
-
                         Ok(ControlFlow::Continue(()))
                     }
                 },
diff --git a/milli/src/snapshot_tests.rs b/milli/src/snapshot_tests.rs
index 9ad5fe425..49f9fbe92 100644
--- a/milli/src/snapshot_tests.rs
+++ b/milli/src/snapshot_tests.rs
@@ -198,118 +198,94 @@ macro_rules! db_snap {
 }
 
 pub fn snap_word_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, word_docids, |(s, b)| {
+    make_db_snap_from_iter!(index, word_docids, |(s, b)| {
         &format!("{s:<16} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_exact_word_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, exact_word_docids, |(s, b)| {
+    make_db_snap_from_iter!(index, exact_word_docids, |(s, b)| {
         &format!("{s:<16} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_word_prefix_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, word_prefix_docids, |(s, b)| {
+    make_db_snap_from_iter!(index, word_prefix_docids, |(s, b)| {
         &format!("{s:<16} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_exact_word_prefix_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, exact_word_prefix_docids, |(s, b)| {
+    make_db_snap_from_iter!(index, exact_word_prefix_docids, |(s, b)| {
         &format!("{s:<16} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_docid_word_positions(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, docid_word_positions, |((idx, s), b)| {
+    make_db_snap_from_iter!(index, docid_word_positions, |((idx, s), b)| {
         &format!("{idx:<6} {s:<16} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_word_pair_proximity_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, word_pair_proximity_docids, |(
-        (proximity, word1, word2),
-        b,
-    )| {
+    make_db_snap_from_iter!(index, word_pair_proximity_docids, |((proximity, word1, word2), b)| {
         &format!("{proximity:<2} {word1:<16} {word2:<16} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_word_prefix_pair_proximity_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, word_prefix_pair_proximity_docids, |(
+    make_db_snap_from_iter!(index, word_prefix_pair_proximity_docids, |(
         (proximity, word1, prefix),
         b,
     )| {
         &format!("{proximity:<2} {word1:<16} {prefix:<4} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_prefix_word_pair_proximity_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, prefix_word_pair_proximity_docids, |(
+    make_db_snap_from_iter!(index, prefix_word_pair_proximity_docids, |(
         (proximity, prefix, word2),
         b,
     )| {
         &format!("{proximity:<2} {prefix:<4} {word2:<16} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_word_position_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, word_position_docids, |((word, position), b)| {
+    make_db_snap_from_iter!(index, word_position_docids, |((word, position), b)| {
         &format!("{word:<16} {position:<6} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_field_id_word_count_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, field_id_word_count_docids, |(
-        (field_id, word_count),
-        b,
-    )| {
+    make_db_snap_from_iter!(index, field_id_word_count_docids, |((field_id, word_count), b)| {
         &format!("{field_id:<3} {word_count:<6} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_word_prefix_position_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, word_prefix_position_docids, |(
-        (word_prefix, position),
-        b,
-    )| {
+    make_db_snap_from_iter!(index, word_prefix_position_docids, |((word_prefix, position), b)| {
         &format!("{word_prefix:<4} {position:<6} {}", display_bitmap(&b))
-    });
-    snap
+    })
 }
 pub fn snap_facet_id_f64_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, facet_id_f64_docids, |(
+    make_db_snap_from_iter!(index, facet_id_f64_docids, |(
         FacetGroupKey { field_id, level, left_bound },
         FacetGroupValue { size, bitmap },
     )| {
         &format!("{field_id:<3} {level:<2} {left_bound:<6} {size:<2} {}", display_bitmap(&bitmap))
-    });
-    snap
+    })
 }
 pub fn snap_facet_id_exists_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, facet_id_exists_docids, |(facet_id, docids)| {
+    make_db_snap_from_iter!(index, facet_id_exists_docids, |(facet_id, docids)| {
         &format!("{facet_id:<3} {}", display_bitmap(&docids))
-    });
-    snap
+    })
 }
 pub fn snap_facet_id_string_docids(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, facet_id_string_docids, |(
+    make_db_snap_from_iter!(index, facet_id_string_docids, |(
         FacetGroupKey { field_id, level, left_bound },
         FacetGroupValue { size, bitmap },
     )| {
         &format!("{field_id:<3} {level:<2} {left_bound:<12} {size:<2} {}", display_bitmap(&bitmap))
-    });
-    snap
+    })
 }
 pub fn snap_field_id_docid_facet_strings(index: &Index) -> String {
-    let snap = make_db_snap_from_iter!(index, field_id_docid_facet_strings, |(
+    make_db_snap_from_iter!(index, field_id_docid_facet_strings, |(
         (field_id, doc_id, string),
         other_string,
     )| {
         &format!("{field_id:<3} {doc_id:<4} {string:<12} {other_string}")
-    });
-    snap
+    })
 }
 pub fn snap_documents_ids(index: &Index) -> String {
     let rtxn = index.read_txn().unwrap();
@@ -541,7 +517,8 @@ pub fn convert_snap_to_hash_if_needed<'snap>(
     snap: &'snap str,
     inline: bool,
 ) -> Vec<(String, Cow<'snap, str>)> {
-    let store_whole_snapshot = std::env::var("MILLI_TEST_FULL_SNAPS").unwrap_or("false".to_owned());
+    let store_whole_snapshot =
+        std::env::var("MILLI_TEST_FULL_SNAPS").unwrap_or_else(|_| "false".to_owned());
     let store_whole_snapshot: bool = store_whole_snapshot.parse().unwrap();
 
     let max_len = if inline { 256 } else { 2048 };
diff --git a/milli/src/update/delete_documents.rs b/milli/src/update/delete_documents.rs
index 635ce85be..f4a6d396e 100644
--- a/milli/src/update/delete_documents.rs
+++ b/milli/src/update/delete_documents.rs
@@ -659,7 +659,9 @@ mod tests {
         // Delete some documents.
         let mut builder = DeleteDocuments::new(wtxn, index).unwrap();
         builder.strategy(strategy);
-        external_ids.iter().for_each(|id| drop(builder.delete_external_id(id)));
+        external_ids.iter().for_each(|id| {
+            builder.delete_external_id(id);
+        });
         builder.execute().unwrap();
 
         ids_to_delete
diff --git a/milli/src/update/facet/incremental.rs b/milli/src/update/facet/incremental.rs
index cffce5525..abe83be7a 100644
--- a/milli/src/update/facet/incremental.rs
+++ b/milli/src/update/facet/incremental.rs
@@ -882,6 +882,7 @@ mod tests {
     }
 
     #[test]
+    #[allow(clippy::needless_range_loop)]
     fn delete_shuffled() {
         let index = FacetIndex::<OrderedF64Codec>::new(4, 8, 5);
         let mut txn = index.env.write_txn().unwrap();
diff --git a/milli/src/update/facet/mod.rs b/milli/src/update/facet/mod.rs
index e2895919f..39a3ef437 100644
--- a/milli/src/update/facet/mod.rs
+++ b/milli/src/update/facet/mod.rs
@@ -254,7 +254,7 @@ pub(crate) mod test_helpers {
             max_group_size: u8,
             min_level_size: u8,
         ) -> FacetIndex<BoundCodec> {
-            let group_size = std::cmp::min(127, std::cmp::max(group_size, 2)); // 2 <= x <= 127
+            let group_size = group_size.clamp(2, 127);
             let max_group_size = std::cmp::min(127, std::cmp::max(group_size * 2, max_group_size)); // 2*group_size <= x <= 127
             let min_level_size = std::cmp::max(1, min_level_size); // 1 <= x <= inf
             let mut options = heed::EnvOpenOptions::new();
@@ -307,7 +307,7 @@ pub(crate) mod test_helpers {
                 min_level_size: self.min_level_size.get(),
                 max_group_size: self.max_group_size.get(),
             };
-            let key_bytes = BoundCodec::bytes_encode(&key).unwrap();
+            let key_bytes = BoundCodec::bytes_encode(key).unwrap();
             update.insert(wtxn, field_id, &key_bytes, docids).unwrap();
         }
         pub fn delete_single_docid<'a>(
@@ -333,7 +333,7 @@ pub(crate) mod test_helpers {
                 min_level_size: self.min_level_size.get(),
                 max_group_size: self.max_group_size.get(),
             };
-            let key_bytes = BoundCodec::bytes_encode(&key).unwrap();
+            let key_bytes = BoundCodec::bytes_encode(key).unwrap();
             update.delete(wtxn, field_id, &key_bytes, docids).unwrap();
         }
 
@@ -354,7 +354,7 @@ pub(crate) mod test_helpers {
                 let key: FacetGroupKey<&[u8]> =
                     FacetGroupKey { field_id: *field_id, level: 0, left_bound: &left_bound_bytes };
                 let key = FacetGroupKeyCodec::<ByteSliceRefCodec>::bytes_encode(&key).unwrap();
-                let value = CboRoaringBitmapCodec::bytes_encode(&docids).unwrap();
+                let value = CboRoaringBitmapCodec::bytes_encode(docids).unwrap();
                 writer.insert(&key, &value).unwrap();
             }
             writer.finish().unwrap();
@@ -381,19 +381,19 @@ pub(crate) mod test_helpers {
                 level_no_prefix.extend_from_slice(&field_id.to_be_bytes());
                 level_no_prefix.push(level_no);
 
-                let mut iter = self
+                let iter = self
                     .content
                     .as_polymorph()
                     .prefix_iter::<_, ByteSlice, FacetGroupValueCodec>(txn, &level_no_prefix)
                     .unwrap();
-                while let Some(el) = iter.next() {
+                for el in iter {
                     let (key, value) = el.unwrap();
-                    let key = FacetGroupKeyCodec::<ByteSliceRefCodec>::bytes_decode(&key).unwrap();
+                    let key = FacetGroupKeyCodec::<ByteSliceRefCodec>::bytes_decode(key).unwrap();
 
                     let mut prefix_start_below = vec![];
                     prefix_start_below.extend_from_slice(&field_id.to_be_bytes());
                     prefix_start_below.push(level_no - 1);
-                    prefix_start_below.extend_from_slice(&key.left_bound);
+                    prefix_start_below.extend_from_slice(key.left_bound);
 
                     let start_below = {
                         let mut start_below_iter = self
@@ -405,19 +405,19 @@ pub(crate) mod test_helpers {
                             )
                             .unwrap();
                         let (key_bytes, _) = start_below_iter.next().unwrap().unwrap();
-                        FacetGroupKeyCodec::<ByteSliceRefCodec>::bytes_decode(&key_bytes).unwrap()
+                        FacetGroupKeyCodec::<ByteSliceRefCodec>::bytes_decode(key_bytes).unwrap()
                     };
 
                     assert!(value.size > 0);
 
                     let mut actual_size = 0;
                     let mut values_below = RoaringBitmap::new();
-                    let mut iter_below = self
+                    let iter_below = self
                         .content
                         .range(txn, &(start_below..))
                         .unwrap()
                         .take(value.size as usize);
-                    while let Some(el) = iter_below.next() {
+                    for el in iter_below {
                         let (_, value) = el.unwrap();
                         actual_size += 1;
                         values_below |= value.bitmap;
@@ -438,8 +438,8 @@ pub(crate) mod test_helpers {
     {
         fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
             let txn = self.env.read_txn().unwrap();
-            let mut iter = self.content.iter(&txn).unwrap();
-            while let Some(el) = iter.next() {
+            let iter = self.content.iter(&txn).unwrap();
+            for el in iter {
                 let (key, value) = el.unwrap();
                 let FacetGroupKey { field_id, level, left_bound: bound } = key;
                 let bound = BoundCodec::bytes_decode(bound).unwrap();
diff --git a/milli/src/update/index_documents/mod.rs b/milli/src/update/index_documents/mod.rs
index f912a756a..be97defbd 100644
--- a/milli/src/update/index_documents/mod.rs
+++ b/milli/src/update/index_documents/mod.rs
@@ -1126,14 +1126,14 @@ mod tests {
             }))
             .unwrap();
 
-        let mut rtxn = index.read_txn().unwrap();
+        let rtxn = index.read_txn().unwrap();
 
-        assert!(index.word_docids.get(&mut rtxn, "0").unwrap().is_some());
-        assert!(index.word_docids.get(&mut rtxn, "64").unwrap().is_some());
-        assert!(index.word_docids.get(&mut rtxn, "256").unwrap().is_some());
-        assert!(index.word_docids.get(&mut rtxn, "1024").unwrap().is_some());
-        assert!(index.word_docids.get(&mut rtxn, "32768").unwrap().is_some());
-        assert!(index.word_docids.get(&mut rtxn, "65535").unwrap().is_some());
+        assert!(index.word_docids.get(&rtxn, "0").unwrap().is_some());
+        assert!(index.word_docids.get(&rtxn, "64").unwrap().is_some());
+        assert!(index.word_docids.get(&rtxn, "256").unwrap().is_some());
+        assert!(index.word_docids.get(&rtxn, "1024").unwrap().is_some());
+        assert!(index.word_docids.get(&rtxn, "32768").unwrap().is_some());
+        assert!(index.word_docids.get(&rtxn, "65535").unwrap().is_some());
     }
 
     #[test]
diff --git a/milli/src/update/settings.rs b/milli/src/update/settings.rs
index f10bfe4e9..55f6c66fe 100644
--- a/milli/src/update/settings.rs
+++ b/milli/src/update/settings.rs
@@ -1539,7 +1539,9 @@ mod tests {
 
         let mut wtxn = index.write_txn().unwrap();
         let mut builder = DeleteDocuments::new(&mut wtxn, &index).unwrap();
-        (0..5).for_each(|id| drop(builder.delete_external_id(&id.to_string())));
+        (0..5).for_each(|id| {
+            builder.delete_external_id(&id.to_string());
+        });
         builder.execute().unwrap();
 
         index
diff --git a/milli/tests/search/mod.rs b/milli/tests/search/mod.rs
index c2f8acd4d..18c74e344 100644
--- a/milli/tests/search/mod.rs
+++ b/milli/tests/search/mod.rs
@@ -87,8 +87,8 @@ pub fn setup_search_index_with_criteria(criteria: &[Criterion]) -> Index {
 }
 
 pub fn internal_to_external_ids(index: &Index, internal_ids: &[DocumentId]) -> Vec<String> {
-    let mut rtxn = index.read_txn().unwrap();
-    let docid_map = index.external_documents_ids(&mut rtxn).unwrap();
+    let rtxn = index.read_txn().unwrap();
+    let docid_map = index.external_documents_ids(&rtxn).unwrap();
     let docid_map: std::collections::HashMap<_, _> =
         EXTERNAL_DOCUMENTS_IDS.iter().map(|id| (docid_map.get(id).unwrap(), id)).collect();
     internal_ids.iter().map(|id| docid_map.get(id).unwrap().to_string()).collect()
@@ -170,18 +170,16 @@ pub fn expected_order(
 fn execute_filter(filter: &str, document: &TestDocument) -> Option<String> {
     let mut id = None;
     if let Some((field, filter)) = filter.split_once("!=") {
-        if field == "tag" && document.tag != filter {
-            id = Some(document.id.clone())
-        } else if field == "asc_desc_rank"
-            && Ok(&document.asc_desc_rank) != filter.parse::<u32>().as_ref()
+        if field == "tag" && document.tag != filter
+            || (field == "asc_desc_rank"
+                && Ok(&document.asc_desc_rank) != filter.parse::<u32>().as_ref())
         {
             id = Some(document.id.clone())
         }
     } else if let Some((field, filter)) = filter.split_once('=') {
-        if field == "tag" && document.tag == filter {
-            id = Some(document.id.clone())
-        } else if field == "asc_desc_rank"
-            && document.asc_desc_rank == filter.parse::<u32>().unwrap()
+        if field == "tag" && document.tag == filter
+            || (field == "asc_desc_rank"
+                && document.asc_desc_rank == filter.parse::<u32>().unwrap())
         {
             id = Some(document.id.clone())
         }
diff --git a/milli/tests/search/phrase_search.rs b/milli/tests/search/phrase_search.rs
index ca5eaad48..2e63c96c4 100644
--- a/milli/tests/search/phrase_search.rs
+++ b/milli/tests/search/phrase_search.rs
@@ -7,15 +7,15 @@ fn set_stop_words(index: &Index, stop_words: &[&str]) {
     let mut wtxn = index.write_txn().unwrap();
     let config = IndexerConfig::default();
 
-    let mut builder = Settings::new(&mut wtxn, &index, &config);
-    let stop_words = stop_words.into_iter().map(|s| s.to_string()).collect();
+    let mut builder = Settings::new(&mut wtxn, index, &config);
+    let stop_words = stop_words.iter().map(|s| s.to_string()).collect();
     builder.set_stop_words(stop_words);
     builder.execute(|_| (), || false).unwrap();
     wtxn.commit().unwrap();
 }
 
 fn test_phrase_search_with_stop_words_given_criteria(criteria: &[Criterion]) {
-    let index = super::setup_search_index_with_criteria(&criteria);
+    let index = super::setup_search_index_with_criteria(criteria);
 
     // Add stop_words
     set_stop_words(&index, &["a", "an", "the", "of"]);
diff --git a/milli/tests/search/query_criteria.rs b/milli/tests/search/query_criteria.rs
index 16058e941..b26752550 100644
--- a/milli/tests/search/query_criteria.rs
+++ b/milli/tests/search/query_criteria.rs
@@ -348,9 +348,9 @@ fn criteria_mixup() {
         builder.execute(|_| (), || false).unwrap();
         wtxn.commit().unwrap();
 
-        let mut rtxn = index.read_txn().unwrap();
+        let rtxn = index.read_txn().unwrap();
 
-        let mut search = Search::new(&mut rtxn, &index);
+        let mut search = Search::new(&rtxn, &index);
         search.query(search::TEST_QUERY);
         search.limit(EXTERNAL_DOCUMENTS_IDS.len());
         search.terms_matching_strategy(ALLOW_OPTIONAL_WORDS);
@@ -440,9 +440,9 @@ fn criteria_ascdesc() {
         builder.execute(|_| (), || false).unwrap();
         wtxn.commit().unwrap();
 
-        let mut rtxn = index.read_txn().unwrap();
+        let rtxn = index.read_txn().unwrap();
 
-        let mut search = Search::new(&mut rtxn, &index);
+        let mut search = Search::new(&rtxn, &index);
         search.limit(ASC_DESC_CANDIDATES_THRESHOLD + 1);
 
         let SearchResult { documents_ids, .. } = search.execute().unwrap();
diff --git a/permissive-json-pointer/src/lib.rs b/permissive-json-pointer/src/lib.rs
index 039bd3320..7e5b3371c 100644
--- a/permissive-json-pointer/src/lib.rs
+++ b/permissive-json-pointer/src/lib.rs
@@ -72,9 +72,9 @@ pub fn map_leaf_values<'a>(
     map_leaf_values_in_object(value, &selectors, "", &mut mapper);
 }
 
-pub fn map_leaf_values_in_object<'a>(
+pub fn map_leaf_values_in_object(
     value: &mut Map<String, Value>,
-    selectors: &[&'a str],
+    selectors: &[&str],
     base_key: &str,
     mapper: &mut impl FnMut(&str, &mut Value),
 ) {