rustdoc: simplify some & ref erences

src/librustdoc/clean/auto_trait.rs

@@ -402,15 +402,13 @@ where
                     bound_params: Vec::new(),
                 })
             })
-            .chain(
-                lifetime_to_bounds.into_iter().filter(|&(_, ref bounds)| !bounds.is_empty()).map(
-                    |(lifetime, bounds)| {
-                        let mut bounds_vec = bounds.into_iter().collect();
-                        self.sort_where_bounds(&mut bounds_vec);
-                        WherePredicate::RegionPredicate { lifetime, bounds: bounds_vec }
-                    },
-                ),
-            )
+            .chain(lifetime_to_bounds.into_iter().filter(|(_, bounds)| !bounds.is_empty()).map(
+                |(lifetime, bounds)| {
+                    let mut bounds_vec = bounds.into_iter().collect();
+                    self.sort_where_bounds(&mut bounds_vec);
+                    WherePredicate::RegionPredicate { lifetime, bounds: bounds_vec }
+                },
+            ))
             .collect()
     }
 

src/librustdoc/clean/simplify.rs

@@ -46,7 +46,7 @@ pub(crate) fn where_clauses(cx: &DocContext<'_>, clauses: Vec<WP>) -> ThinVec<WP
 
     // Look for equality predicates on associated types that can be merged into
     // general bound predicates.
-    equalities.retain(|&(ref lhs, ref rhs, ref bound_params)| {
+    equalities.retain(|(lhs, rhs, bound_params)| {
         let Some((ty, trait_did, name)) = lhs.projection() else { return true; };
         let Some((bounds, _)) = tybounds.get_mut(ty) else { return true };
         let bound_params = bound_params

src/librustdoc/formats/cache.rs

@@ -296,7 +296,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
                             // for where the type was defined. On the other
                             // hand, `paths` always has the right
                             // information if present.
-                            Some(&(ref fqp, _)) => Some(&fqp[..fqp.len() - 1]),
+                            Some((fqp, _)) => Some(&fqp[..fqp.len() - 1]),
                             None => None,
                         };
                         ((did, path), true)

src/librustdoc/html/format.rs

@@ -962,7 +962,7 @@ fn fmt_type<'cx>(
         clean::Tuple(ref typs) => {
             match &typs[..] {
                 &[] => primitive_link(f, PrimitiveType::Unit, "()", cx),
-                &[ref one] => {
+                [one] => {
                     if let clean::Generic(name) = one {
                         primitive_link(f, PrimitiveType::Tuple, &format!("({name},)"), cx)
                     } else {

src/librustdoc/html/render/search_index.rs

@@ -29,7 +29,7 @@ pub(crate) fn build_index<'tcx>(
     // Attach all orphan items to the type's definition if the type
     // has since been learned.
     for &OrphanImplItem { parent, ref item, ref impl_generics } in &cache.orphan_impl_items {
-        if let Some(&(ref fqp, _)) = cache.paths.get(&parent) {
+        if let Some((fqp, _)) = cache.paths.get(&parent) {
             let desc = item
                 .doc_value()
                 .map_or_else(String::new, |s| short_markdown_summary(&s, &item.link_names(cache)));
@@ -573,7 +573,7 @@ fn get_fn_inputs_and_outputs<'tcx>(
     let decl = &func.decl;
 
     let combined_generics;
-    let (self_, generics) = if let Some(&(ref impl_self, ref impl_generics)) = impl_generics {
+    let (self_, generics) = if let Some((impl_self, impl_generics)) = impl_generics {
         match (impl_generics.is_empty(), func.generics.is_empty()) {
             (true, _) => (Some(impl_self), &func.generics),
             (_, true) => (Some(impl_self), impl_generics),