Auto merge of #129789 - notriddle:notriddle/inline-stmt-local, r=GuillaumeGomez

rustdoc: use strategic boxing to shrink `clean::Item`

* `inline_stmt_id` is never a cross-crate DefId, so save space by not storing it.
* Instead of two inner boxes for `Item`, use one.

Author: bors

src/librustdoc/clean/auto_trait.rs

@@ -115,17 +115,19 @@ fn synthesize_auto_trait_impl<'tcx>(
 
     Some(clean::Item {
         name: None,
-        attrs: Default::default(),
+        inner: Box::new(clean::ItemInner {
+            attrs: Default::default(),
+            kind: clean::ImplItem(Box::new(clean::Impl {
+                safety: hir::Safety::Safe,
+                generics,
+                trait_: Some(clean_trait_ref_with_constraints(cx, trait_ref, ThinVec::new())),
+                for_: clean_middle_ty(ty::Binder::dummy(ty), cx, None, None),
+                items: Vec::new(),
+                polarity,
+                kind: clean::ImplKind::Auto,
+            })),
+        }),
         item_id: clean::ItemId::Auto { trait_: trait_def_id, for_: item_def_id },
-        kind: Box::new(clean::ImplItem(Box::new(clean::Impl {
-            safety: hir::Safety::Safe,
-            generics,
-            trait_: Some(clean_trait_ref_with_constraints(cx, trait_ref, ThinVec::new())),
-            for_: clean_middle_ty(ty::Binder::dummy(ty), cx, None, None),
-            items: Vec::new(),
-            polarity,
-            kind: clean::ImplKind::Auto,
-        }))),
         cfg: None,
         inline_stmt_id: None,
     })

src/librustdoc/clean/blanket_impl.rs

@@ -84,42 +84,44 @@ pub(crate) fn synthesize_blanket_impls(
 
             blanket_impls.push(clean::Item {
                 name: None,
-                attrs: Default::default(),
                 item_id: clean::ItemId::Blanket { impl_id: impl_def_id, for_: item_def_id },
-                kind: Box::new(clean::ImplItem(Box::new(clean::Impl {
-                    safety: hir::Safety::Safe,
-                    generics: clean_ty_generics(
-                        cx,
-                        tcx.generics_of(impl_def_id),
-                        tcx.explicit_predicates_of(impl_def_id),
-                    ),
-                    // FIXME(eddyb) compute both `trait_` and `for_` from
-                    // the post-inference `trait_ref`, as it's more accurate.
-                    trait_: Some(clean_trait_ref_with_constraints(
-                        cx,
-                        ty::Binder::dummy(trait_ref.instantiate_identity()),
-                        ThinVec::new(),
-                    )),
-                    for_: clean_middle_ty(
-                        ty::Binder::dummy(ty.instantiate_identity()),
-                        cx,
-                        None,
-                        None,
-                    ),
-                    items: tcx
-                        .associated_items(impl_def_id)
-                        .in_definition_order()
-                        .filter(|item| !item.is_impl_trait_in_trait())
-                        .map(|item| clean_middle_assoc_item(item, cx))
-                        .collect(),
-                    polarity: ty::ImplPolarity::Positive,
-                    kind: clean::ImplKind::Blanket(Box::new(clean_middle_ty(
-                        ty::Binder::dummy(trait_ref.instantiate_identity().self_ty()),
-                        cx,
-                        None,
-                        None,
-                    ))),
-                }))),
+                inner: Box::new(clean::ItemInner {
+                    attrs: Default::default(),
+                    kind: clean::ImplItem(Box::new(clean::Impl {
+                        safety: hir::Safety::Safe,
+                        generics: clean_ty_generics(
+                            cx,
+                            tcx.generics_of(impl_def_id),
+                            tcx.explicit_predicates_of(impl_def_id),
+                        ),
+                        // FIXME(eddyb) compute both `trait_` and `for_` from
+                        // the post-inference `trait_ref`, as it's more accurate.
+                        trait_: Some(clean_trait_ref_with_constraints(
+                            cx,
+                            ty::Binder::dummy(trait_ref.instantiate_identity()),
+                            ThinVec::new(),
+                        )),
+                        for_: clean_middle_ty(
+                            ty::Binder::dummy(ty.instantiate_identity()),
+                            cx,
+                            None,
+                            None,
+                        ),
+                        items: tcx
+                            .associated_items(impl_def_id)
+                            .in_definition_order()
+                            .filter(|item| !item.is_impl_trait_in_trait())
+                            .map(|item| clean_middle_assoc_item(item, cx))
+                            .collect(),
+                        polarity: ty::ImplPolarity::Positive,
+                        kind: clean::ImplKind::Blanket(Box::new(clean_middle_ty(
+                            ty::Binder::dummy(trait_ref.instantiate_identity().self_ty()),
+                            cx,
+                            None,
+                            None,
+                        ))),
+                    })),
+                }),
                 cfg: None,
                 inline_stmt_id: None,
             });

src/librustdoc/clean/inline.rs

@@ -5,7 +5,7 @@ use std::sync::Arc;
 
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::def_id::{DefId, DefIdSet, LocalModDefId};
+use rustc_hir::def_id::{DefId, DefIdSet, LocalDefId, LocalModDefId};
 use rustc_hir::Mutability;
 use rustc_metadata::creader::{CStore, LoadedMacro};
 use rustc_middle::ty::fast_reject::SimplifiedType;
@@ -43,7 +43,7 @@ pub(crate) fn try_inline(
     cx: &mut DocContext<'_>,
     res: Res,
     name: Symbol,
-    attrs: Option<(&[ast::Attribute], Option<DefId>)>,
+    attrs: Option<(&[ast::Attribute], Option<LocalDefId>)>,
     visited: &mut DefIdSet,
 ) -> Option<Vec<clean::Item>> {
     let did = res.opt_def_id()?;
@@ -152,14 +152,8 @@ pub(crate) fn try_inline(
     };
 
     cx.inlined.insert(did.into());
-    let mut item = crate::clean::generate_item_with_correct_attrs(
-        cx,
-        kind,
-        did,
-        name,
-        import_def_id.and_then(|def_id| def_id.as_local()),
-        None,
-    );
+    let mut item =
+        crate::clean::generate_item_with_correct_attrs(cx, kind, did, name, import_def_id, None);
     // The visibility needs to reflect the one from the reexport and not from the "source" DefId.
     item.inline_stmt_id = import_def_id;
     ret.push(item);
@@ -198,7 +192,7 @@ pub(crate) fn try_inline_glob(
                 visited,
                 inlined_names,
                 Some(&reexports),
-                Some((attrs, Some(import.owner_id.def_id.to_def_id()))),
+                Some((attrs, Some(import.owner_id.def_id))),
             );
             items.retain(|item| {
                 if let Some(name) = item.name {
@@ -372,7 +366,7 @@ fn build_type_alias(
 pub(crate) fn build_impls(
     cx: &mut DocContext<'_>,
     did: DefId,
-    attrs: Option<(&[ast::Attribute], Option<DefId>)>,
+    attrs: Option<(&[ast::Attribute], Option<LocalDefId>)>,
     ret: &mut Vec<clean::Item>,
 ) {
     let _prof_timer = cx.tcx.sess.prof.generic_activity("build_inherent_impls");
@@ -405,7 +399,7 @@ pub(crate) fn build_impls(
 pub(crate) fn merge_attrs(
     cx: &mut DocContext<'_>,
     old_attrs: &[ast::Attribute],
-    new_attrs: Option<(&[ast::Attribute], Option<DefId>)>,
+    new_attrs: Option<(&[ast::Attribute], Option<LocalDefId>)>,
 ) -> (clean::Attributes, Option<Arc<clean::cfg::Cfg>>) {
     // NOTE: If we have additional attributes (from a re-export),
     // always insert them first. This ensure that re-export
@@ -416,7 +410,7 @@ pub(crate) fn merge_attrs(
         both.extend_from_slice(old_attrs);
         (
             if let Some(item_id) = item_id {
-                Attributes::from_ast_with_additional(old_attrs, (inner, item_id))
+                Attributes::from_ast_with_additional(old_attrs, (inner, item_id.to_def_id()))
             } else {
                 Attributes::from_ast(&both)
             },
@@ -431,7 +425,7 @@ pub(crate) fn merge_attrs(
 pub(crate) fn build_impl(
     cx: &mut DocContext<'_>,
     did: DefId,
-    attrs: Option<(&[ast::Attribute], Option<DefId>)>,
+    attrs: Option<(&[ast::Attribute], Option<LocalDefId>)>,
     ret: &mut Vec<clean::Item>,
 ) {
     if !cx.inlined.insert(did.into()) {
@@ -623,7 +617,7 @@ pub(crate) fn build_impl(
                 ImplKind::Normal
             },
         })),
-        Box::new(merged_attrs),
+        merged_attrs,
         cfg,
     ));
 }
@@ -641,7 +635,7 @@ fn build_module_items(
     visited: &mut DefIdSet,
     inlined_names: &mut FxHashSet<(ItemType, Symbol)>,
     allowed_def_ids: Option<&DefIdSet>,
-    attrs: Option<(&[ast::Attribute], Option<DefId>)>,
+    attrs: Option<(&[ast::Attribute], Option<LocalDefId>)>,
 ) -> Vec<clean::Item> {
     let mut items = Vec::new();
 
@@ -673,27 +667,29 @@ fn build_module_items(
                 let prim_ty = clean::PrimitiveType::from(p);
                 items.push(clean::Item {
                     name: None,
-                    attrs: Box::default(),
                     // We can use the item's `DefId` directly since the only information ever used
                     // from it is `DefId.krate`.
                     item_id: ItemId::DefId(did),
-                    kind: Box::new(clean::ImportItem(clean::Import::new_simple(
-                        item.ident.name,
-                        clean::ImportSource {
-                            path: clean::Path {
-                                res,
-                                segments: thin_vec![clean::PathSegment {
-                                    name: prim_ty.as_sym(),
-                                    args: clean::GenericArgs::AngleBracketed {
-                                        args: Default::default(),
-                                        constraints: ThinVec::new(),
-                                    },
-                                }],
+                    inner: Box::new(clean::ItemInner {
+                        attrs: Default::default(),
+                        kind: clean::ImportItem(clean::Import::new_simple(
+                            item.ident.name,
+                            clean::ImportSource {
+                                path: clean::Path {
+                                    res,
+                                    segments: thin_vec![clean::PathSegment {
+                                        name: prim_ty.as_sym(),
+                                        args: clean::GenericArgs::AngleBracketed {
+                                            args: Default::default(),
+                                            constraints: ThinVec::new(),
+                                        },
+                                    }],
+                                },
+                                did: None,
                             },
-                            did: None,
-                        },
-                        true,
-                    ))),
+                            true,
+                        )),
+                    }),
                     cfg: None,
                     inline_stmt_id: None,
                 });
@@ -745,15 +741,16 @@ fn build_macro(
     cx: &mut DocContext<'_>,
     def_id: DefId,
     name: Symbol,
-    import_def_id: Option<DefId>,
+    import_def_id: Option<LocalDefId>,
     macro_kind: MacroKind,
     is_doc_hidden: bool,
 ) -> clean::ItemKind {
     match CStore::from_tcx(cx.tcx).load_macro_untracked(def_id, cx.tcx) {
         LoadedMacro::MacroDef(item_def, _) => match macro_kind {
             MacroKind::Bang => {
                 if let ast::ItemKind::MacroDef(ref def) = item_def.kind {
-                    let vis = cx.tcx.visibility(import_def_id.unwrap_or(def_id));
+                    let vis =
+                        cx.tcx.visibility(import_def_id.map(|d| d.to_def_id()).unwrap_or(def_id));
                     clean::MacroItem(clean::Macro {
                         source: utils::display_macro_source(
                             cx,

src/librustdoc/clean/mod.rs

@@ -203,8 +203,8 @@ fn generate_item_with_correct_attrs(
     let attrs = Attributes::from_ast_iter(attrs.iter().map(|(attr, did)| (&**attr, *did)), false);
 
     let name = renamed.or(Some(name));
-    let mut item = Item::from_def_id_and_attrs_and_parts(def_id, name, kind, Box::new(attrs), cfg);
-    item.inline_stmt_id = import_id.map(|local| local.to_def_id());
+    let mut item = Item::from_def_id_and_attrs_and_parts(def_id, name, kind, attrs, cfg);
+    item.inline_stmt_id = import_id;
     item
 }
 
@@ -2927,7 +2927,7 @@ fn clean_extern_crate<'tcx>(
         })
         && !cx.output_format.is_json();
 
-    let krate_owner_def_id = krate.owner_id.to_def_id();
+    let krate_owner_def_id = krate.owner_id.def_id;
     if please_inline {
         if let Some(items) = inline::try_inline(
             cx,
@@ -2941,7 +2941,7 @@ fn clean_extern_crate<'tcx>(
     }
 
     vec![Item::from_def_id_and_parts(
-        krate_owner_def_id,
+        krate_owner_def_id.to_def_id(),
         Some(name),
         ExternCrateItem { src: orig_name },
         cx,
@@ -2988,7 +2988,7 @@ fn clean_use_statement_inner<'tcx>(
     let inline_attr = attrs.lists(sym::doc).get_word_attr(sym::inline);
     let pub_underscore = visibility.is_public() && name == kw::Underscore;
     let current_mod = cx.tcx.parent_module_from_def_id(import.owner_id.def_id);
-    let import_def_id = import.owner_id.def_id.to_def_id();
+    let import_def_id = import.owner_id.def_id;
 
     // The parent of the module in which this import resides. This
     // is the same as `current_mod` if that's already the top
@@ -3071,7 +3071,7 @@ fn clean_use_statement_inner<'tcx>(
             )
         {
             items.push(Item::from_def_id_and_parts(
-                import_def_id,
+                import_def_id.to_def_id(),
                 None,
                 ImportItem(Import::new_simple(name, resolve_use_source(cx, path), false)),
                 cx,
@@ -3081,7 +3081,7 @@ fn clean_use_statement_inner<'tcx>(
         Import::new_simple(name, resolve_use_source(cx, path), true)
     };
 
-    vec![Item::from_def_id_and_parts(import_def_id, None, ImportItem(inner), cx)]
+    vec![Item::from_def_id_and_parts(import_def_id.to_def_id(), None, ImportItem(inner), cx)]
 }
 
 fn clean_maybe_renamed_foreign_item<'tcx>(

src/librustdoc/clean/types.rs

@@ -320,16 +320,30 @@ pub(crate) struct Item {
     /// The name of this item.
     /// Optional because not every item has a name, e.g. impls.
     pub(crate) name: Option<Symbol>,
-    pub(crate) attrs: Box<Attributes>,
-    /// Information about this item that is specific to what kind of item it is.
-    /// E.g., struct vs enum vs function.
-    pub(crate) kind: Box<ItemKind>,
+    pub(crate) inner: Box<ItemInner>,
     pub(crate) item_id: ItemId,
-    /// This is the `DefId` of the `use` statement if the item was inlined.
-    pub(crate) inline_stmt_id: Option<DefId>,
+    /// This is the `LocalDefId` of the `use` statement if the item was inlined.
+    /// The crate metadata doesn't hold this information, so the `use` statement
+    /// always belongs to the current crate.
+    pub(crate) inline_stmt_id: Option<LocalDefId>,
     pub(crate) cfg: Option<Arc<Cfg>>,
 }
 
+#[derive(Clone)]
+pub(crate) struct ItemInner {
+    /// Information about this item that is specific to what kind of item it is.
+    /// E.g., struct vs enum vs function.
+    pub(crate) kind: ItemKind,
+    pub(crate) attrs: Attributes,
+}
+
+impl std::ops::Deref for Item {
+    type Target = ItemInner;
+    fn deref(&self) -> &ItemInner {
+        &*self.inner
+    }
+}
+
 /// NOTE: this does NOT unconditionally print every item, to avoid thousands of lines of logs.
 /// If you want to see the debug output for attributes and the `kind` as well, use `{:#?}` instead of `{:?}`.
 impl fmt::Debug for Item {
@@ -389,9 +403,9 @@ impl Item {
     }
 
     pub(crate) fn span(&self, tcx: TyCtxt<'_>) -> Option<Span> {
-        let kind = match &*self.kind {
-            ItemKind::StrippedItem(k) => k,
-            _ => &*self.kind,
+        let kind = match &self.kind {
+            ItemKind::StrippedItem(k) => &*k,
+            _ => &self.kind,
         };
         match kind {
             ItemKind::ModuleItem(Module { span, .. }) => Some(*span),
@@ -436,7 +450,7 @@ impl Item {
             def_id,
             name,
             kind,
-            Box::new(Attributes::from_ast(ast_attrs)),
+            Attributes::from_ast(ast_attrs),
             ast_attrs.cfg(cx.tcx, &cx.cache.hidden_cfg),
         )
     }
@@ -445,16 +459,15 @@ impl Item {
         def_id: DefId,
         name: Option<Symbol>,
         kind: ItemKind,
-        attrs: Box<Attributes>,
+        attrs: Attributes,
         cfg: Option<Arc<Cfg>>,
     ) -> Item {
         trace!("name={name:?}, def_id={def_id:?} cfg={cfg:?}");
 
         Item {
             item_id: def_id.into(),
-            kind: Box::new(kind),
+            inner: Box::new(ItemInner { kind, attrs }),
             name,
-            attrs,
             cfg,
             inline_stmt_id: None,
         }
@@ -522,16 +535,16 @@ impl Item {
         self.type_() == ItemType::Variant
     }
     pub(crate) fn is_associated_type(&self) -> bool {
-        matches!(&*self.kind, AssocTypeItem(..) | StrippedItem(box AssocTypeItem(..)))
+        matches!(self.kind, AssocTypeItem(..) | StrippedItem(box AssocTypeItem(..)))
     }
     pub(crate) fn is_ty_associated_type(&self) -> bool {
-        matches!(&*self.kind, TyAssocTypeItem(..) | StrippedItem(box TyAssocTypeItem(..)))
+        matches!(self.kind, TyAssocTypeItem(..) | StrippedItem(box TyAssocTypeItem(..)))
     }
     pub(crate) fn is_associated_const(&self) -> bool {
-        matches!(&*self.kind, AssocConstItem(..) | StrippedItem(box AssocConstItem(..)))
+        matches!(self.kind, AssocConstItem(..) | StrippedItem(box AssocConstItem(..)))
     }
     pub(crate) fn is_ty_associated_const(&self) -> bool {
-        matches!(&*self.kind, TyAssocConstItem(..) | StrippedItem(box TyAssocConstItem(..)))
+        matches!(self.kind, TyAssocConstItem(..) | StrippedItem(box TyAssocConstItem(..)))
     }
     pub(crate) fn is_method(&self) -> bool {
         self.type_() == ItemType::Method
@@ -555,14 +568,14 @@ impl Item {
         self.type_() == ItemType::Keyword
     }
     pub(crate) fn is_stripped(&self) -> bool {
-        match *self.kind {
+        match self.kind {
             StrippedItem(..) => true,
             ImportItem(ref i) => !i.should_be_displayed,
             _ => false,
         }
     }
     pub(crate) fn has_stripped_entries(&self) -> Option<bool> {
-        match *self.kind {
+        match self.kind {
             StructItem(ref struct_) => Some(struct_.has_stripped_entries()),
             UnionItem(ref union_) => Some(union_.has_stripped_entries()),
             EnumItem(ref enum_) => Some(enum_.has_stripped_entries()),
@@ -605,7 +618,7 @@ impl Item {
     }
 
     pub(crate) fn is_default(&self) -> bool {
-        match *self.kind {
+        match self.kind {
             ItemKind::MethodItem(_, Some(defaultness)) => {
                 defaultness.has_value() && !defaultness.is_final()
             }
@@ -633,7 +646,7 @@ impl Item {
             };
             hir::FnHeader { safety: sig.safety(), abi: sig.abi(), constness, asyncness }
         }
-        let header = match *self.kind {
+        let header = match self.kind {
             ItemKind::ForeignFunctionItem(_, safety) => {
                 let def_id = self.def_id().unwrap();
                 let abi = tcx.fn_sig(def_id).skip_binder().abi();
@@ -672,7 +685,7 @@ impl Item {
             ItemId::DefId(def_id) => def_id,
         };
 
-        match *self.kind {
+        match self.kind {
             // Primitives and Keywords are written in the source code as private modules.
             // The modules need to be private so that nobody actually uses them, but the
             // keywords and primitives that they are documenting are public.
@@ -702,7 +715,7 @@ impl Item {
             _ => {}
         }
         let def_id = match self.inline_stmt_id {
-            Some(inlined) => inlined,
+            Some(inlined) => inlined.to_def_id(),
             None => def_id,
         };
         Some(tcx.visibility(def_id))
@@ -2559,13 +2572,13 @@ mod size_asserts {
 
     use super::*;
     // tidy-alphabetical-start
-    static_assert_size!(Crate, 64); // frequently moved by-value
+    static_assert_size!(Crate, 56); // frequently moved by-value
     static_assert_size!(DocFragment, 32);
     static_assert_size!(GenericArg, 32);
     static_assert_size!(GenericArgs, 32);
     static_assert_size!(GenericParamDef, 40);
     static_assert_size!(Generics, 16);
-    static_assert_size!(Item, 56);
+    static_assert_size!(Item, 48);
     static_assert_size!(ItemKind, 48);
     static_assert_size!(PathSegment, 40);
     static_assert_size!(Type, 32);

src/librustdoc/clean/utils.rs

@@ -36,7 +36,7 @@ pub(crate) fn krate(cx: &mut DocContext<'_>) -> Crate {
     // understood by rustdoc.
     let mut module = clean_doc_module(&module, cx);
 
-    match *module.kind {
+    match module.kind {
         ItemKind::ModuleItem(ref module) => {
             for it in &module.items {
                 // `compiler_builtins` should be masked too, but we can't apply
@@ -60,7 +60,7 @@ pub(crate) fn krate(cx: &mut DocContext<'_>) -> Crate {
     let primitives = local_crate.primitives(cx.tcx);
     let keywords = local_crate.keywords(cx.tcx);
     {
-        let ItemKind::ModuleItem(ref mut m) = *module.kind else { unreachable!() };
+        let ItemKind::ModuleItem(ref mut m) = &mut module.inner.kind else { unreachable!() };
         m.items.extend(primitives.iter().map(|&(def_id, prim)| {
             Item::from_def_id_and_parts(
                 def_id,
@@ -281,7 +281,7 @@ pub(crate) fn build_deref_target_impls(
     let tcx = cx.tcx;
 
     for item in items {
-        let target = match *item.kind {
+        let target = match item.kind {
             ItemKind::AssocTypeItem(ref t, _) => &t.type_,
             _ => continue,
         };

src/librustdoc/fold.rs

@@ -1,8 +1,8 @@
 use crate::clean::*;
 
 pub(crate) fn strip_item(mut item: Item) -> Item {
-    if !matches!(*item.kind, StrippedItem(..)) {
-        item.kind = Box::new(StrippedItem(item.kind));
+    if !matches!(item.inner.kind, StrippedItem(..)) {
+        item.inner.kind = StrippedItem(Box::new(item.inner.kind));
     }
     item
 }
@@ -99,10 +99,10 @@ pub(crate) trait DocFolder: Sized {
 
     /// don't override!
     fn fold_item_recur(&mut self, mut item: Item) -> Item {
-        item.kind = Box::new(match *item.kind {
+        item.inner.kind = match item.inner.kind {
             StrippedItem(box i) => StrippedItem(Box::new(self.fold_inner_recur(i))),
-            _ => self.fold_inner_recur(*item.kind),
-        });
+            _ => self.fold_inner_recur(item.inner.kind),
+        };
         item
     }
 

src/librustdoc/formats/cache.rs

@@ -216,7 +216,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
 
         // If this is a stripped module,
         // we don't want it or its children in the search index.
-        let orig_stripped_mod = match *item.kind {
+        let orig_stripped_mod = match item.kind {
             clean::StrippedItem(box clean::ModuleItem(..)) => {
                 mem::replace(&mut self.cache.stripped_mod, true)
             }
@@ -232,7 +232,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
 
         // If the impl is from a masked crate or references something from a
         // masked crate then remove it completely.
-        if let clean::ImplItem(ref i) = *item.kind
+        if let clean::ImplItem(ref i) = item.kind
             && (self.cache.masked_crates.contains(&item.item_id.krate())
                 || i.trait_
                     .as_ref()
@@ -246,9 +246,9 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
 
         // Propagate a trait method's documentation to all implementors of the
         // trait.
-        if let clean::TraitItem(ref t) = *item.kind {
+        if let clean::TraitItem(ref t) = item.kind {
             self.cache.traits.entry(item.item_id.expect_def_id()).or_insert_with(|| (**t).clone());
-        } else if let clean::ImplItem(ref i) = *item.kind
+        } else if let clean::ImplItem(ref i) = item.kind
             && let Some(trait_) = &i.trait_
             && !i.kind.is_blanket()
         {
@@ -263,7 +263,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
         // Index this method for searching later on.
         let search_name = if !item.is_stripped() {
             item.name.or_else(|| {
-                if let clean::ImportItem(ref i) = *item.kind
+                if let clean::ImportItem(ref i) = item.kind
                     && let clean::ImportKind::Simple(s) = i.kind
                 {
                     Some(s)
@@ -287,7 +287,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
             _ => false,
         };
 
-        match *item.kind {
+        match item.kind {
             clean::StructItem(..)
             | clean::EnumItem(..)
             | clean::TypeAliasItem(..)
@@ -350,7 +350,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
         }
 
         // Maintain the parent stack.
-        let (item, parent_pushed) = match *item.kind {
+        let (item, parent_pushed) = match item.kind {
             clean::TraitItem(..)
             | clean::EnumItem(..)
             | clean::ForeignTypeItem
@@ -367,7 +367,11 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
 
         // Once we've recursively found all the generics, hoard off all the
         // implementations elsewhere.
-        let ret = if let clean::Item { kind: box clean::ImplItem(ref i), .. } = item {
+        let ret = if let clean::Item {
+            inner: box clean::ItemInner { kind: clean::ImplItem(ref i), .. },
+            ..
+        } = item
+        {
             // Figure out the id of this impl. This may map to a
             // primitive rather than always to a struct/enum.
             // Note: matching twice to restrict the lifetime of the `i` borrow.
@@ -436,7 +440,7 @@ impl<'a, 'tcx> DocFolder for CacheBuilder<'a, 'tcx> {
 fn add_item_to_search_index(tcx: TyCtxt<'_>, cache: &mut Cache, item: &clean::Item, name: Symbol) {
     // Item has a name, so it must also have a DefId (can't be an impl, let alone a blanket or auto impl).
     let item_def_id = item.item_id.as_def_id().unwrap();
-    let (parent_did, parent_path) = match *item.kind {
+    let (parent_did, parent_path) = match item.kind {
         clean::StrippedItem(..) => return,
         clean::AssocConstItem(..) | clean::AssocTypeItem(..)
             if cache.parent_stack.last().is_some_and(|parent| parent.is_trait_impl()) =>
@@ -528,7 +532,7 @@ fn add_item_to_search_index(tcx: TyCtxt<'_>, cache: &mut Cache, item: &clean::It
     // - It's either an inline, or a true re-export
     // - It's got the same name
     // - Both of them have the same exact path
-    let defid = match &*item.kind {
+    let defid = match &item.kind {
         clean::ItemKind::ImportItem(import) => import.source.did.unwrap_or(item_def_id),
         _ => item_def_id,
     };
@@ -605,7 +609,7 @@ enum ParentStackItem {
 
 impl ParentStackItem {
     fn new(item: &clean::Item) -> Self {
-        match &*item.kind {
+        match &item.kind {
             clean::ItemKind::ImplItem(box clean::Impl { for_, trait_, generics, kind, .. }) => {
                 ParentStackItem::Impl {
                     for_: for_.clone(),

src/librustdoc/formats/item_type.rs

@@ -70,7 +70,7 @@ impl Serialize for ItemType {
 
 impl<'a> From<&'a clean::Item> for ItemType {
     fn from(item: &'a clean::Item) -> ItemType {
-        let kind = match *item.kind {
+        let kind = match item.kind {
             clean::StrippedItem(box ref item) => item,
             ref kind => kind,
         };

src/librustdoc/formats/mod.rs

@@ -16,7 +16,7 @@ pub(crate) struct Impl {
 
 impl Impl {
     pub(crate) fn inner_impl(&self) -> &clean::Impl {
-        match *self.impl_item.kind {
+        match self.impl_item.kind {
             clean::ImplItem(ref impl_) => impl_,
             _ => panic!("non-impl item found in impl"),
         }

src/librustdoc/formats/renderer.rs

@@ -77,7 +77,7 @@ pub(crate) fn run_format<'tcx, T: FormatRenderer<'tcx>>(
 
             cx.mod_item_in(&item)?;
             let (clean::StrippedItem(box clean::ModuleItem(module)) | clean::ModuleItem(module)) =
-                *item.kind
+                item.inner.kind
             else {
                 unreachable!()
             };

src/librustdoc/html/render/context.rs

@@ -800,7 +800,7 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
         // Render sidebar-items.js used throughout this module.
         if !self.render_redirect_pages {
             let (clean::StrippedItem(box clean::ModuleItem(ref module))
-            | clean::ModuleItem(ref module)) = *item.kind
+            | clean::ModuleItem(ref module)) = item.kind
             else {
                 unreachable!()
             };

src/librustdoc/html/render/mod.rs

@@ -620,7 +620,7 @@ fn document_full_inner<'a, 'cx: 'a>(
             }
         }
 
-        let kind = match &*item.kind {
+        let kind = match &item.kind {
             clean::ItemKind::StrippedItem(box kind) | kind => kind,
         };
 
@@ -1072,7 +1072,7 @@ fn render_assoc_item(
     cx: &mut Context<'_>,
     render_mode: RenderMode,
 ) {
-    match &*item.kind {
+    match &item.kind {
         clean::StrippedItem(..) => {}
         clean::TyMethodItem(m) => {
             assoc_method(w, item, &m.generics, &m.decl, link, parent, cx, render_mode)
@@ -1350,7 +1350,7 @@ fn render_deref_methods(
         .inner_impl()
         .items
         .iter()
-        .find_map(|item| match *item.kind {
+        .find_map(|item| match item.kind {
             clean::AssocTypeItem(box ref t, _) => Some(match *t {
                 clean::TypeAlias { item_type: Some(ref type_), .. } => (type_, &t.type_),
                 _ => (&t.type_, &t.type_),
@@ -1381,7 +1381,7 @@ fn render_deref_methods(
 }
 
 fn should_render_item(item: &clean::Item, deref_mut_: bool, tcx: TyCtxt<'_>) -> bool {
-    let self_type_opt = match *item.kind {
+    let self_type_opt = match item.kind {
         clean::MethodItem(ref method, _) => method.decl.receiver_type(),
         clean::TyMethodItem(ref method) => method.decl.receiver_type(),
         _ => None,
@@ -1491,7 +1491,7 @@ fn notable_traits_decl(ty: &clean::Type, cx: &Context<'_>) -> (String, String) {
 
                 write!(&mut out, "<div class=\"where\">{}</div>", impl_.print(false, cx));
                 for it in &impl_.items {
-                    if let clean::AssocTypeItem(ref tydef, ref _bounds) = *it.kind {
+                    if let clean::AssocTypeItem(ref tydef, ref _bounds) = it.kind {
                         out.push_str("<div class=\"where\">    ");
                         let empty_set = FxHashSet::default();
                         let src_link = AssocItemLink::GotoSource(trait_did.into(), &empty_set);
@@ -1659,7 +1659,7 @@ fn render_impl(
             let method_toggle_class = if item_type.is_method() { " method-toggle" } else { "" };
             write!(w, "<details class=\"toggle{method_toggle_class}\" open><summary>");
         }
-        match &*item.kind {
+        match &item.kind {
             clean::MethodItem(..) | clean::TyMethodItem(_) => {
                 // Only render when the method is not static or we allow static methods
                 if render_method_item {
@@ -1690,7 +1690,7 @@ fn render_impl(
                     w.write_str("</h4></section>");
                 }
             }
-            clean::TyAssocConstItem(generics, ty) => {
+            clean::TyAssocConstItem(ref generics, ref ty) => {
                 let source_id = format!("{item_type}.{name}");
                 let id = cx.derive_id(&source_id);
                 write!(w, "<section id=\"{id}\" class=\"{item_type}{in_trait_class}\">");
@@ -1734,7 +1734,7 @@ fn render_impl(
                 );
                 w.write_str("</h4></section>");
             }
-            clean::TyAssocTypeItem(generics, bounds) => {
+            clean::TyAssocTypeItem(ref generics, ref bounds) => {
                 let source_id = format!("{item_type}.{name}");
                 let id = cx.derive_id(&source_id);
                 write!(w, "<section id=\"{id}\" class=\"{item_type}{in_trait_class}\">");
@@ -1808,7 +1808,7 @@ fn render_impl(
 
     if !impl_.is_negative_trait_impl() {
         for trait_item in &impl_.items {
-            match *trait_item.kind {
+            match trait_item.kind {
                 clean::MethodItem(..) | clean::TyMethodItem(_) => methods.push(trait_item),
                 clean::TyAssocTypeItem(..) | clean::AssocTypeItem(..) => {
                     assoc_types.push(trait_item)
@@ -2051,7 +2051,7 @@ pub(crate) fn render_impl_summary(
         write!(w, "{}", inner_impl.print(use_absolute, cx));
         if show_def_docs {
             for it in &inner_impl.items {
-                if let clean::AssocTypeItem(ref tydef, ref _bounds) = *it.kind {
+                if let clean::AssocTypeItem(ref tydef, ref _bounds) = it.kind {
                     w.write_str("<div class=\"where\">  ");
                     assoc_type(
                         w,
@@ -2172,7 +2172,7 @@ fn get_id_for_impl<'tcx>(tcx: TyCtxt<'tcx>, impl_id: ItemId) -> String {
 }
 
 fn extract_for_impl_name(item: &clean::Item, cx: &Context<'_>) -> Option<(String, String)> {
-    match *item.kind {
+    match item.kind {
         clean::ItemKind::ImplItem(ref i) if i.trait_.is_some() => {
             // Alternative format produces no URLs,
             // so this parameter does nothing.

src/librustdoc/html/render/print_item.rs

@@ -178,7 +178,7 @@ fn print_where_clause_and_check<'a, 'tcx: 'a>(
 
 pub(super) fn print_item(cx: &mut Context<'_>, item: &clean::Item, buf: &mut Buffer) {
     debug_assert!(!item.is_stripped());
-    let typ = match *item.kind {
+    let typ = match item.kind {
         clean::ModuleItem(_) => {
             if item.is_crate() {
                 "Crate "
@@ -252,7 +252,7 @@ pub(super) fn print_item(cx: &mut Context<'_>, item: &clean::Item, buf: &mut Buf
 
     item_vars.render_into(buf).unwrap();
 
-    match &*item.kind {
+    match &item.kind {
         clean::ModuleItem(ref m) => item_module(buf, cx, item, &m.items),
         clean::FunctionItem(ref f) | clean::ForeignFunctionItem(ref f, _) => {
             item_function(buf, cx, item, f)
@@ -411,7 +411,7 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
             );
         }
 
-        match *myitem.kind {
+        match myitem.kind {
             clean::ExternCrateItem { ref src } => {
                 use crate::html::format::anchor;
 
@@ -477,7 +477,7 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
                     continue;
                 }
 
-                let unsafety_flag = match *myitem.kind {
+                let unsafety_flag = match myitem.kind {
                     clean::FunctionItem(_) | clean::ForeignFunctionItem(..)
                         if myitem.fn_header(tcx).unwrap().safety == hir::Safety::Unsafe =>
                     {
@@ -1439,7 +1439,7 @@ fn item_union(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, s: &clean:
             self.s
                 .fields
                 .iter()
-                .filter_map(|f| match *f.kind {
+                .filter_map(|f| match f.kind {
                     clean::StructFieldItem(ref ty) => Some((f, ty)),
                     _ => None,
                 })
@@ -1457,7 +1457,7 @@ fn print_tuple_struct_fields<'a, 'cx: 'a>(
     display_fn(|f| {
         if !s.is_empty()
             && s.iter().all(|field| {
-                matches!(*field.kind, clean::StrippedItem(box clean::StructFieldItem(..)))
+                matches!(field.kind, clean::StrippedItem(box clean::StructFieldItem(..)))
             })
         {
             return f.write_str("<span class=\"comment\">/* private fields */</span>");
@@ -1467,7 +1467,7 @@ fn print_tuple_struct_fields<'a, 'cx: 'a>(
             if i > 0 {
                 f.write_str(", ")?;
             }
-            match *ty.kind {
+            match ty.kind {
                 clean::StrippedItem(box clean::StructFieldItem(_)) => f.write_str("_")?,
                 clean::StructFieldItem(ref ty) => write!(f, "{}", ty.print(cx))?,
                 _ => unreachable!(),
@@ -1521,7 +1521,7 @@ fn should_show_enum_discriminant(
 ) -> bool {
     let mut has_variants_with_value = false;
     for variant in variants {
-        if let clean::VariantItem(ref var) = *variant.kind
+        if let clean::VariantItem(ref var) = variant.kind
             && matches!(var.kind, clean::VariantKind::CLike)
         {
             has_variants_with_value |= var.discriminant.is_some();
@@ -1592,7 +1592,7 @@ fn render_enum_fields(
                 continue;
             }
             w.write_str(TAB);
-            match *v.kind {
+            match v.kind {
                 clean::VariantItem(ref var) => match var.kind {
                     clean::VariantKind::CLike => display_c_like_variant(
                         w,
@@ -1659,7 +1659,7 @@ fn item_variants(
             " rightside",
         );
         w.write_str("<h3 class=\"code-header\">");
-        if let clean::VariantItem(ref var) = *variant.kind
+        if let clean::VariantItem(ref var) = variant.kind
             && let clean::VariantKind::CLike = var.kind
         {
             display_c_like_variant(
@@ -1675,7 +1675,7 @@ fn item_variants(
             w.write_str(variant.name.unwrap().as_str());
         }
 
-        let clean::VariantItem(variant_data) = &*variant.kind else { unreachable!() };
+        let clean::VariantItem(variant_data) = &variant.kind else { unreachable!() };
 
         if let clean::VariantKind::Tuple(ref s) = variant_data.kind {
             write!(w, "({})", print_tuple_struct_fields(cx, s));
@@ -1716,7 +1716,7 @@ fn item_variants(
                 document_non_exhaustive(variant)
             );
             for field in fields {
-                match *field.kind {
+                match field.kind {
                     clean::StrippedItem(box clean::StructFieldItem(_)) => {}
                     clean::StructFieldItem(ref ty) => {
                         let id = cx.derive_id(format!(
@@ -1886,7 +1886,7 @@ fn item_fields(
 ) {
     let mut fields = fields
         .iter()
-        .filter_map(|f| match *f.kind {
+        .filter_map(|f| match f.kind {
             clean::StructFieldItem(ref ty) => Some((f, ty)),
             _ => None,
         })
@@ -2196,14 +2196,14 @@ fn render_union<'a, 'cx: 'a>(
 
         write!(f, "{{\n")?;
         let count_fields =
-            fields.iter().filter(|field| matches!(*field.kind, clean::StructFieldItem(..))).count();
+            fields.iter().filter(|field| matches!(field.kind, clean::StructFieldItem(..))).count();
         let toggle = should_hide_fields(count_fields);
         if toggle {
             toggle_open(&mut f, format_args!("{count_fields} fields"));
         }
 
         for field in fields {
-            if let clean::StructFieldItem(ref ty) = *field.kind {
+            if let clean::StructFieldItem(ref ty) = field.kind {
                 write!(
                     f,
                     "    {}{}: {},\n",
@@ -2279,14 +2279,14 @@ fn render_struct_fields(
                 w.write_str("{");
             }
             let count_fields =
-                fields.iter().filter(|f| matches!(*f.kind, clean::StructFieldItem(..))).count();
+                fields.iter().filter(|f| matches!(f.kind, clean::StructFieldItem(..))).count();
             let has_visible_fields = count_fields > 0;
             let toggle = should_hide_fields(count_fields);
             if toggle {
                 toggle_open(&mut w, format_args!("{count_fields} fields"));
             }
             for field in fields {
-                if let clean::StructFieldItem(ref ty) = *field.kind {
+                if let clean::StructFieldItem(ref ty) = field.kind {
                     write!(
                         w,
                         "\n{tab}    {vis}{name}: {ty},",
@@ -2314,7 +2314,7 @@ fn render_struct_fields(
             w.write_str("(");
             if !fields.is_empty()
                 && fields.iter().all(|field| {
-                    matches!(*field.kind, clean::StrippedItem(box clean::StructFieldItem(..)))
+                    matches!(field.kind, clean::StrippedItem(box clean::StructFieldItem(..)))
                 })
             {
                 write!(w, "<span class=\"comment\">/* private fields */</span>");
@@ -2323,7 +2323,7 @@ fn render_struct_fields(
                     if i > 0 {
                         w.write_str(", ");
                     }
-                    match *field.kind {
+                    match field.kind {
                         clean::StrippedItem(box clean::StructFieldItem(..)) => write!(w, "_"),
                         clean::StructFieldItem(ref ty) => {
                             write!(w, "{}{}", visibility_print_with_space(field, cx), ty.print(cx),)

src/librustdoc/html/render/search_index.rs

@@ -758,7 +758,7 @@ pub(crate) fn get_function_type_for_search<'tcx>(
             None
         }
     });
-    let (mut inputs, mut output, where_clause) = match *item.kind {
+    let (mut inputs, mut output, where_clause) = match item.kind {
         clean::FunctionItem(ref f) | clean::MethodItem(ref f, _) | clean::TyMethodItem(ref f) => {
             get_fn_inputs_and_outputs(f, tcx, impl_or_trait_generics, cache)
         }
@@ -1132,7 +1132,7 @@ fn simplify_fn_type<'tcx, 'a>(
                 && trait_.items.iter().any(|at| at.is_ty_associated_type())
             {
                 for assoc_ty in &trait_.items {
-                    if let clean::ItemKind::TyAssocTypeItem(_generics, bounds) = &*assoc_ty.kind
+                    if let clean::ItemKind::TyAssocTypeItem(_generics, bounds) = &assoc_ty.kind
                         && let Some(name) = assoc_ty.name
                     {
                         let idx = -isize::try_from(rgen.len() + 1).unwrap();

src/librustdoc/html/render/sidebar.rs

@@ -119,7 +119,7 @@ pub(crate) mod filters {
 pub(super) fn print_sidebar(cx: &Context<'_>, it: &clean::Item, buffer: &mut Buffer) {
     let mut ids = IdMap::new();
     let mut blocks: Vec<LinkBlock<'_>> = docblock_toc(cx, it, &mut ids).into_iter().collect();
-    match *it.kind {
+    match it.kind {
         clean::StructItem(ref s) => sidebar_struct(cx, it, s, &mut blocks),
         clean::TraitItem(ref t) => sidebar_trait(cx, it, t, &mut blocks),
         clean::PrimitiveItem(_) => sidebar_primitive(cx, it, &mut blocks),
@@ -143,7 +143,7 @@ pub(super) fn print_sidebar(cx: &Context<'_>, it: &clean::Item, buffer: &mut Buf
     // crate title is displayed as part of logo lockup
     let (title_prefix, title) = if !blocks.is_empty() && !it.is_crate() {
         (
-            match *it.kind {
+            match it.kind {
                 clean::ModuleItem(..) => "Module ",
                 _ => "",
             },
@@ -181,7 +181,7 @@ pub(super) fn print_sidebar(cx: &Context<'_>, it: &clean::Item, buffer: &mut Buf
 fn get_struct_fields_name<'a>(fields: &'a [clean::Item]) -> Vec<Link<'a>> {
     let mut fields = fields
         .iter()
-        .filter(|f| matches!(*f.kind, clean::StructFieldItem(..)))
+        .filter(|f| matches!(f.kind, clean::StructFieldItem(..)))
         .filter_map(|f| {
             f.name.as_ref().map(|name| Link::new(format!("structfield.{name}"), name.as_str()))
         })
@@ -467,7 +467,7 @@ fn sidebar_deref_methods<'a>(
 
     debug!("found Deref: {impl_:?}");
     if let Some((target, real_target)) =
-        impl_.inner_impl().items.iter().find_map(|item| match *item.kind {
+        impl_.inner_impl().items.iter().find_map(|item| match item.kind {
             clean::AssocTypeItem(box ref t, _) => Some(match *t {
                 clean::TypeAlias { item_type: Some(ref type_), .. } => (type_, &t.type_),
                 _ => (&t.type_, &t.type_),
@@ -587,7 +587,7 @@ fn sidebar_module(
                 && it
                     .name
                     .or_else(|| {
-                        if let clean::ImportItem(ref i) = *it.kind
+                        if let clean::ImportItem(ref i) = it.kind
                             && let clean::ImportKind::Simple(s) = i.kind
                         {
                             Some(s)

src/librustdoc/html/render/write_shared.rs

@@ -783,7 +783,7 @@ impl<'cx, 'cache> DocVisitor for TypeImplCollector<'cx, 'cache> {
     fn visit_item(&mut self, it: &Item) {
         self.visit_item_recur(it);
         let cache = self.cache;
-        let ItemKind::TypeAliasItem(ref t) = *it.kind else { return };
+        let ItemKind::TypeAliasItem(ref t) = it.kind else { return };
         let Some(self_did) = it.item_id.as_def_id() else { return };
         if !self.visited_aliases.insert(self_did) {
             return;

src/librustdoc/json/conversions.rs

@@ -49,7 +49,7 @@ impl JsonRenderer<'_> {
         let visibility = item.visibility(self.tcx);
         let clean::Item { name, item_id, .. } = item;
         let id = id_from_item(&item, self.tcx);
-        let inner = match *item.kind {
+        let inner = match item.kind {
             clean::KeywordItem => return None,
             clean::StrippedItem(ref inner) => {
                 match &**inner {
@@ -294,7 +294,7 @@ pub(crate) fn id_from_item_inner(
 }
 
 pub(crate) fn id_from_item(item: &clean::Item, tcx: TyCtxt<'_>) -> Id {
-    match *item.kind {
+    match item.kind {
         clean::ItemKind::ImportItem(ref import) => {
             let extra =
                 import.source.did.map(ItemId::from).map(|i| id_from_item_inner(i, tcx, None, None));
@@ -310,7 +310,7 @@ fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
     let is_crate = item.is_crate();
     let header = item.fn_header(tcx);
 
-    match *item.kind {
+    match item.inner.kind {
         ModuleItem(m) => {
             ItemEnum::Module(Module { is_crate, items: ids(m.items, tcx), is_stripped: false })
         }

src/librustdoc/json/import_finder.rs

@@ -24,7 +24,7 @@ struct ImportFinder {
 
 impl DocFolder for ImportFinder {
     fn fold_item(&mut self, i: Item) -> Option<Item> {
-        match *i.kind {
+        match i.kind {
             clean::ImportItem(Import { source: ImportSource { did: Some(did), .. }, .. }) => {
                 self.imported.insert(did);
                 Some(i)

src/librustdoc/json/mod.rs

@@ -85,7 +85,7 @@ impl<'tcx> JsonRenderer<'tcx> {
                         // document primitive items in an arbitrary crate by using
                         // `rustc_doc_primitive`.
                         let mut is_primitive_impl = false;
-                        if let clean::types::ItemKind::ImplItem(ref impl_) = *item.kind
+                        if let clean::types::ItemKind::ImplItem(ref impl_) = item.kind
                             && impl_.trait_.is_none()
                             && let clean::types::Type::Primitive(_) = impl_.for_
                         {
@@ -164,7 +164,7 @@ impl<'tcx> FormatRenderer<'tcx> for JsonRenderer<'tcx> {
 
         // Flatten items that recursively store other items. We include orphaned items from
         // stripped modules and etc that are otherwise reachable.
-        if let ItemKind::StrippedItem(inner) = &*item.kind {
+        if let ItemKind::StrippedItem(inner) = &item.kind {
             inner.inner_items().for_each(|i| self.item(i.clone()).unwrap());
         }
 

src/librustdoc/passes/calculate_doc_coverage.rs

@@ -195,7 +195,7 @@ impl<'a, 'b> DocVisitor for CoverageCalculator<'a, 'b> {
             return;
         }
 
-        match *i.kind {
+        match i.kind {
             clean::StrippedItem(..) => {
                 // don't count items in stripped modules
                 return;

src/librustdoc/passes/check_doc_test_visibility.rs

@@ -57,7 +57,7 @@ impl crate::doctest::DocTestVisitor for Tests {
 pub(crate) fn should_have_doc_example(cx: &DocContext<'_>, item: &clean::Item) -> bool {
     if !cx.cache.effective_visibilities.is_directly_public(cx.tcx, item.item_id.expect_def_id())
         || matches!(
-            *item.kind,
+            item.kind,
             clean::StructFieldItem(_)
                 | clean::VariantItem(_)
                 | clean::AssocConstItem(..)

src/librustdoc/passes/collect_trait_impls.rs

@@ -160,13 +160,13 @@ pub(crate) fn collect_trait_impls(mut krate: Crate, cx: &mut DocContext<'_>) ->
 
     // scan through included items ahead of time to splice in Deref targets to the "valid" sets
     for it in new_items_external.iter().chain(new_items_local.iter()) {
-        if let ImplItem(box Impl { ref for_, ref trait_, ref items, .. }) = *it.kind
+        if let ImplItem(box Impl { ref for_, ref trait_, ref items, .. }) = it.kind
             && trait_.as_ref().map(|t| t.def_id()) == tcx.lang_items().deref_trait()
             && cleaner.keep_impl(for_, true)
         {
             let target = items
                 .iter()
-                .find_map(|item| match *item.kind {
+                .find_map(|item| match item.kind {
                     AssocTypeItem(ref t, _) => Some(&t.type_),
                     _ => None,
                 })
@@ -200,7 +200,7 @@ pub(crate) fn collect_trait_impls(mut krate: Crate, cx: &mut DocContext<'_>) ->
 
     // Filter out external items that are not needed
     new_items_external.retain(|it| {
-        if let ImplItem(box Impl { ref for_, ref trait_, ref kind, .. }) = *it.kind {
+        if let ImplItem(box Impl { ref for_, ref trait_, ref kind, .. }) = it.kind {
             cleaner.keep_impl(
                 for_,
                 trait_.as_ref().map(|t| t.def_id()) == tcx.lang_items().deref_trait(),
@@ -211,7 +211,7 @@ pub(crate) fn collect_trait_impls(mut krate: Crate, cx: &mut DocContext<'_>) ->
         }
     });
 
-    if let ModuleItem(Module { items, .. }) = &mut *krate.module.kind {
+    if let ModuleItem(Module { items, .. }) = &mut krate.module.inner.kind {
         items.extend(synth_impls);
         items.extend(new_items_external);
         items.extend(new_items_local);
@@ -258,7 +258,7 @@ impl<'cache> DocVisitor for ItemAndAliasCollector<'cache> {
     fn visit_item(&mut self, i: &Item) {
         self.items.insert(i.item_id);
 
-        if let TypeAliasItem(alias) = &*i.kind
+        if let TypeAliasItem(alias) = &i.inner.kind
             && let Some(did) = alias.type_.def_id(self.cache)
         {
             self.items.insert(ItemId::DefId(did));

src/librustdoc/passes/propagate_doc_cfg.rs

@@ -31,7 +31,7 @@ impl<'a, 'tcx> CfgPropagator<'a, 'tcx> {
     // Some items need to merge their attributes with their parents' otherwise a few of them
     // (mostly `cfg` ones) will be missing.
     fn merge_with_parent_attributes(&mut self, item: &mut Item) {
-        let check_parent = match &*item.kind {
+        let check_parent = match &item.kind {
             // impl blocks can be in different modules with different cfg and we need to get them
             // as well.
             ItemKind::ImplItem(_) => false,

src/librustdoc/passes/strip_aliased_non_local.rs

@@ -23,7 +23,7 @@ struct AliasedNonLocalStripper<'tcx> {
 
 impl<'tcx> DocFolder for AliasedNonLocalStripper<'tcx> {
     fn fold_item(&mut self, i: Item) -> Option<Item> {
-        Some(match *i.kind {
+        Some(match i.kind {
             clean::TypeAliasItem(..) => {
                 let mut stripper = NonLocalStripper { tcx: self.tcx };
                 // don't call `fold_item` as that could strip the type-alias it-self

src/librustdoc/passes/strip_hidden.rs

@@ -89,7 +89,7 @@ impl<'a, 'tcx> Stripper<'a, 'tcx> {
 impl<'a, 'tcx> DocFolder for Stripper<'a, 'tcx> {
     fn fold_item(&mut self, i: Item) -> Option<Item> {
         let has_doc_hidden = i.is_doc_hidden();
-        let is_impl_or_exported_macro = match *i.kind {
+        let is_impl_or_exported_macro = match i.kind {
             clean::ImplItem(..) => true,
             // If the macro has the `#[macro_export]` attribute, it means it's accessible at the
             // crate level so it should be handled differently.
@@ -138,7 +138,7 @@ impl<'a, 'tcx> DocFolder for Stripper<'a, 'tcx> {
         // module it's defined in. Both of these are marked "stripped," and
         // not included in the final docs, but since they still have an effect
         // on the final doc, cannot be completely removed from the Clean IR.
-        match *i.kind {
+        match i.kind {
             clean::StructFieldItem(..) | clean::ModuleItem(..) | clean::VariantItem(..) => {
                 // We need to recurse into stripped modules to
                 // strip things like impl methods but when doing so

src/librustdoc/passes/stripper.rs

@@ -39,7 +39,7 @@ fn is_item_reachable(
 
 impl<'a, 'tcx> DocFolder for Stripper<'a, 'tcx> {
     fn fold_item(&mut self, i: Item) -> Option<Item> {
-        match *i.kind {
+        match i.kind {
             clean::StrippedItem(..) => {
                 // We need to recurse into stripped modules to strip things
                 // like impl methods but when doing so we must not add any
@@ -130,7 +130,7 @@ impl<'a, 'tcx> DocFolder for Stripper<'a, 'tcx> {
             clean::KeywordItem => {}
         }
 
-        let fastreturn = match *i.kind {
+        let fastreturn = match i.kind {
             // nothing left to do for traits (don't want to filter their
             // methods out, visibility controlled by the trait)
             clean::TraitItem(..) => true,
@@ -195,7 +195,7 @@ impl<'a> ImplStripper<'a, '_> {
 
 impl<'a> DocFolder for ImplStripper<'a, '_> {
     fn fold_item(&mut self, i: Item) -> Option<Item> {
-        if let clean::ImplItem(ref imp) = *i.kind {
+        if let clean::ImplItem(ref imp) = i.kind {
             // Impl blocks can be skipped if they are: empty; not a trait impl; and have no
             // documentation.
             //
@@ -272,7 +272,7 @@ impl<'tcx> ImportStripper<'tcx> {
 
 impl<'tcx> DocFolder for ImportStripper<'tcx> {
     fn fold_item(&mut self, i: Item) -> Option<Item> {
-        match *i.kind {
+        match &i.kind {
             clean::ImportItem(imp)
                 if !self.document_hidden && self.import_should_be_hidden(&i, &imp) =>
             {

src/librustdoc/visit.rs

@@ -48,8 +48,8 @@ pub(crate) trait DocVisitor: Sized {
 
     /// don't override!
     fn visit_item_recur(&mut self, item: &Item) {
-        match &*item.kind {
-            StrippedItem(i) => self.visit_inner_recur(i),
+        match &item.kind {
+            StrippedItem(i) => self.visit_inner_recur(&*i),
             _ => self.visit_inner_recur(&item.kind),
         }
     }