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-rw-r--r--compiler/rustc_ast_lowering/src/item.rs31
-rw-r--r--compiler/rustc_hir/src/hir.rs26
-rw-r--r--compiler/rustc_hir/src/intravisit.rs11
-rw-r--r--compiler/rustc_hir_analysis/src/collect/type_of.rs2
-rw-r--r--compiler/rustc_lint/src/builtin.rs7
-rw-r--r--compiler/rustc_lint/src/nonstandard_style.rs7
-rw-r--r--compiler/rustc_middle/src/ty/context.rs26
-rw-r--r--compiler/rustc_passes/src/dead.rs32
-rw-r--r--compiler/rustc_passes/src/stability.rs3
-rw-r--r--compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs2
-rw-r--r--compiler/rustc_ty_utils/src/assoc.rs12
-rw-r--r--compiler/rustc_ty_utils/src/ty.rs9
-rw-r--r--src/tools/clippy/clippy_lints/src/disallowed_macros.rs6
-rw-r--r--src/tools/clippy/clippy_lints/src/manual_async_fn.rs12
-rw-r--r--src/tools/clippy/clippy_lints/src/min_ident_chars.rs6
-rw-r--r--src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs18
-rw-r--r--src/tools/clippy/clippy_utils/src/check_proc_macro.rs32
17 files changed, 143 insertions, 99 deletions
diff --git a/compiler/rustc_ast_lowering/src/item.rs b/compiler/rustc_ast_lowering/src/item.rs
index bb559bd8921..53351f91c46 100644
--- a/compiler/rustc_ast_lowering/src/item.rs
+++ b/compiler/rustc_ast_lowering/src/item.rs
@@ -5,7 +5,9 @@ use rustc_errors::{E0570, ErrorGuaranteed, struct_span_code_err};
 use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def::{DefKind, PerNS, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, LocalDefId};
-use rustc_hir::{self as hir, HirId, LifetimeSource, PredicateOrigin, Target, find_attr};
+use rustc_hir::{
+    self as hir, HirId, ImplItemImplKind, LifetimeSource, PredicateOrigin, Target, find_attr,
+};
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_middle::span_bug;
 use rustc_middle::ty::{ResolverAstLowering, TyCtxt};
@@ -1117,20 +1119,31 @@ impl<'hir> LoweringContext<'_, 'hir> {
             }
         };
 
+        let span = self.lower_span(i.span);
         let item = hir::ImplItem {
             owner_id: hir_id.expect_owner(),
             ident: self.lower_ident(ident),
             generics,
+            impl_kind: if is_in_trait_impl {
+                ImplItemImplKind::Trait {
+                    defaultness,
+                    trait_item_def_id: self
+                        .resolver
+                        .get_partial_res(i.id)
+                        .and_then(|r| r.expect_full_res().opt_def_id())
+                        .ok_or_else(|| {
+                            self.dcx().span_delayed_bug(
+                                span,
+                                "could not resolve trait item being implemented",
+                            )
+                        }),
+                }
+            } else {
+                ImplItemImplKind::Inherent { vis_span: self.lower_span(i.vis.span) }
+            },
             kind,
-            vis_span: self.lower_span(i.vis.span),
-            span: self.lower_span(i.span),
-            defaultness,
+            span,
             has_delayed_lints: !self.delayed_lints.is_empty(),
-            trait_item_def_id: self
-                .resolver
-                .get_partial_res(i.id)
-                .map(|r| r.expect_full_res().opt_def_id())
-                .unwrap_or(None),
         };
         self.arena.alloc(item)
     }
diff --git a/compiler/rustc_hir/src/hir.rs b/compiler/rustc_hir/src/hir.rs
index 75551fe4c19..493236718a8 100644
--- a/compiler/rustc_hir/src/hir.rs
+++ b/compiler/rustc_hir/src/hir.rs
@@ -3220,12 +3220,21 @@ pub struct ImplItem<'hir> {
     pub owner_id: OwnerId,
     pub generics: &'hir Generics<'hir>,
     pub kind: ImplItemKind<'hir>,
-    pub defaultness: Defaultness,
+    pub impl_kind: ImplItemImplKind,
     pub span: Span,
-    pub vis_span: Span,
     pub has_delayed_lints: bool,
-    /// When we are in a trait impl, link to the trait-item's id.
-    pub trait_item_def_id: Option<DefId>,
+}
+
+#[derive(Debug, Clone, Copy, HashStable_Generic)]
+pub enum ImplItemImplKind {
+    Inherent {
+        vis_span: Span,
+    },
+    Trait {
+        defaultness: Defaultness,
+        /// Item in the trait that this item implements
+        trait_item_def_id: Result<DefId, ErrorGuaranteed>,
+    },
 }
 
 impl<'hir> ImplItem<'hir> {
@@ -3239,6 +3248,13 @@ impl<'hir> ImplItem<'hir> {
         ImplItemId { owner_id: self.owner_id }
     }
 
+    pub fn vis_span(&self) -> Option<Span> {
+        match self.impl_kind {
+            ImplItemImplKind::Trait { .. } => None,
+            ImplItemImplKind::Inherent { vis_span, .. } => Some(vis_span),
+        }
+    }
+
     expect_methods_self_kind! {
         expect_const, (&'hir Ty<'hir>, BodyId), ImplItemKind::Const(ty, body), (ty, *body);
         expect_fn,    (&FnSig<'hir>, BodyId),   ImplItemKind::Fn(ty, body),    (ty, *body);
@@ -4985,7 +5001,7 @@ mod size_asserts {
     static_assert_size!(GenericBound<'_>, 64);
     static_assert_size!(Generics<'_>, 56);
     static_assert_size!(Impl<'_>, 40);
-    static_assert_size!(ImplItem<'_>, 96);
+    static_assert_size!(ImplItem<'_>, 88);
     static_assert_size!(ImplItemKind<'_>, 40);
     static_assert_size!(Item<'_>, 88);
     static_assert_size!(ItemKind<'_>, 64);
diff --git a/compiler/rustc_hir/src/intravisit.rs b/compiler/rustc_hir/src/intravisit.rs
index 25a7ae239f3..eb682f32111 100644
--- a/compiler/rustc_hir/src/intravisit.rs
+++ b/compiler/rustc_hir/src/intravisit.rs
@@ -1257,18 +1257,21 @@ pub fn walk_impl_item<'v, V: Visitor<'v>>(
         owner_id: _,
         ident,
         ref generics,
+        ref impl_kind,
         ref kind,
-        ref defaultness,
         span: _,
-        vis_span: _,
         has_delayed_lints: _,
-        trait_item_def_id: _,
     } = *impl_item;
 
     try_visit!(visitor.visit_ident(ident));
     try_visit!(visitor.visit_generics(generics));
-    try_visit!(visitor.visit_defaultness(defaultness));
     try_visit!(visitor.visit_id(impl_item.hir_id()));
+    match impl_kind {
+        ImplItemImplKind::Inherent { vis_span: _ } => {}
+        ImplItemImplKind::Trait { defaultness, trait_item_def_id: _ } => {
+            try_visit!(visitor.visit_defaultness(defaultness));
+        }
+    }
     match *kind {
         ImplItemKind::Const(ref ty, body) => {
             try_visit!(visitor.visit_ty_unambig(ty));
diff --git a/compiler/rustc_hir_analysis/src/collect/type_of.rs b/compiler/rustc_hir_analysis/src/collect/type_of.rs
index a8af73717cd..8cbf17162e3 100644
--- a/compiler/rustc_hir_analysis/src/collect/type_of.rs
+++ b/compiler/rustc_hir_analysis/src/collect/type_of.rs
@@ -198,7 +198,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: LocalDefId) -> ty::EarlyBinder<'_
                 }
             }
             ImplItemKind::Type(ty) => {
-                if tcx.impl_trait_ref(tcx.hir_get_parent_item(hir_id)).is_none() {
+                if let ImplItemImplKind::Inherent { .. } = item.impl_kind {
                     check_feature_inherent_assoc_ty(tcx, item.span);
                 }
 
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index c3c0a34df71..d4c83a0cca7 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -29,7 +29,7 @@ use rustc_hir::attrs::AttributeKind;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CRATE_DEF_ID, DefId, LocalDefId};
 use rustc_hir::intravisit::FnKind as HirFnKind;
-use rustc_hir::{Body, FnDecl, PatKind, PredicateOrigin, find_attr};
+use rustc_hir::{Body, FnDecl, ImplItemImplKind, PatKind, PredicateOrigin, find_attr};
 use rustc_middle::bug;
 use rustc_middle::lint::LevelAndSource;
 use rustc_middle::ty::layout::LayoutOf;
@@ -1321,9 +1321,8 @@ impl<'tcx> LateLintPass<'tcx> for UnreachablePub {
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {
-        // Only lint inherent impl items.
-        if cx.tcx.associated_item(impl_item.owner_id).trait_item_def_id.is_none() {
-            self.perform_lint(cx, "item", impl_item.owner_id.def_id, impl_item.vis_span, false);
+        if let ImplItemImplKind::Inherent { vis_span } = impl_item.impl_kind {
+            self.perform_lint(cx, "item", impl_item.owner_id.def_id, vis_span, false);
         }
     }
 }
diff --git a/compiler/rustc_lint/src/nonstandard_style.rs b/compiler/rustc_lint/src/nonstandard_style.rs
index 7b8f17ef93c..7cdd82b66c1 100644
--- a/compiler/rustc_lint/src/nonstandard_style.rs
+++ b/compiler/rustc_lint/src/nonstandard_style.rs
@@ -38,11 +38,6 @@ pub(crate) fn method_context(cx: &LateContext<'_>, id: LocalDefId) -> MethodLate
     }
 }
 
-fn assoc_item_in_trait_impl(cx: &LateContext<'_>, ii: &hir::ImplItem<'_>) -> bool {
-    let item = cx.tcx.associated_item(ii.owner_id);
-    item.trait_item_def_id.is_some()
-}
-
 declare_lint! {
     /// The `non_camel_case_types` lint detects types, variants, traits and
     /// type parameters that don't have camel case names.
@@ -602,7 +597,7 @@ impl<'tcx> LateLintPass<'tcx> for NonUpperCaseGlobals {
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, ii: &hir::ImplItem<'_>) {
         if let hir::ImplItemKind::Const(..) = ii.kind
-            && !assoc_item_in_trait_impl(cx, ii)
+            && let hir::ImplItemImplKind::Inherent { .. } = ii.impl_kind
         {
             NonUpperCaseGlobals::check_upper_case(cx, "associated constant", None, &ii.ident);
         }
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 8ea767dccd3..79700d485c4 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -2276,7 +2276,16 @@ impl<'tcx> TyCtxt<'tcx> {
 
         let is_impl_item = match self.hir_node_by_def_id(suitable_region_binding_scope) {
             Node::Item(..) | Node::TraitItem(..) => false,
-            Node::ImplItem(..) => self.is_bound_region_in_impl_item(suitable_region_binding_scope),
+            Node::ImplItem(impl_item) => match impl_item.impl_kind {
+                // For now, we do not try to target impls of traits. This is
+                // because this message is going to suggest that the user
+                // change the fn signature, but they may not be free to do so,
+                // since the signature must match the trait.
+                //
+                // FIXME(#42706) -- in some cases, we could do better here.
+                hir::ImplItemImplKind::Trait { .. } => true,
+                _ => false,
+            },
             _ => false,
         };
 
@@ -2330,21 +2339,6 @@ impl<'tcx> TyCtxt<'tcx> {
         None
     }
 
-    /// Checks if the bound region is in Impl Item.
-    pub fn is_bound_region_in_impl_item(self, suitable_region_binding_scope: LocalDefId) -> bool {
-        let container_id = self.parent(suitable_region_binding_scope.to_def_id());
-        if self.impl_trait_ref(container_id).is_some() {
-            // For now, we do not try to target impls of traits. This is
-            // because this message is going to suggest that the user
-            // change the fn signature, but they may not be free to do so,
-            // since the signature must match the trait.
-            //
-            // FIXME(#42706) -- in some cases, we could do better here.
-            return true;
-        }
-        false
-    }
-
     /// Determines whether identifiers in the assembly have strict naming rules.
     /// Currently, only NVPTX* targets need it.
     pub fn has_strict_asm_symbol_naming(self) -> bool {
diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs
index f36a7a5b184..3c2c9683a4d 100644
--- a/compiler/rustc_passes/src/dead.rs
+++ b/compiler/rustc_passes/src/dead.rs
@@ -373,31 +373,27 @@ impl<'tcx> MarkSymbolVisitor<'tcx> {
     /// Automatically generated items marked with `rustc_trivial_field_reads`
     /// will be ignored for the purposes of dead code analysis (see PR #85200
     /// for discussion).
-    fn should_ignore_item(&mut self, def_id: DefId) -> bool {
-        if let Some(impl_of) = self.tcx.trait_impl_of_assoc(def_id) {
-            if !self.tcx.is_automatically_derived(impl_of) {
-                return false;
-            }
-
-            if let Some(trait_of) = self.tcx.trait_id_of_impl(impl_of)
-                && self.tcx.has_attr(trait_of, sym::rustc_trivial_field_reads)
+    fn should_ignore_impl_item(&mut self, impl_item: &hir::ImplItem<'_>) -> bool {
+        if let hir::ImplItemImplKind::Trait { .. } = impl_item.impl_kind
+            && let impl_of = self.tcx.parent(impl_item.owner_id.to_def_id())
+            && self.tcx.is_automatically_derived(impl_of)
+            && let trait_ref = self.tcx.impl_trait_ref(impl_of).unwrap().instantiate_identity()
+            && self.tcx.has_attr(trait_ref.def_id, sym::rustc_trivial_field_reads)
+        {
+            if let ty::Adt(adt_def, _) = trait_ref.self_ty().kind()
+                && let Some(adt_def_id) = adt_def.did().as_local()
             {
-                let trait_ref = self.tcx.impl_trait_ref(impl_of).unwrap().instantiate_identity();
-                if let ty::Adt(adt_def, _) = trait_ref.self_ty().kind()
-                    && let Some(adt_def_id) = adt_def.did().as_local()
-                {
-                    self.ignored_derived_traits.entry(adt_def_id).or_default().insert(trait_of);
-                }
-                return true;
+                self.ignored_derived_traits.entry(adt_def_id).or_default().insert(trait_ref.def_id);
             }
+            return true;
         }
 
         false
     }
 
     fn visit_node(&mut self, node: Node<'tcx>) {
-        if let Node::ImplItem(hir::ImplItem { owner_id, .. }) = node
-            && self.should_ignore_item(owner_id.to_def_id())
+        if let Node::ImplItem(impl_item) = node
+            && self.should_ignore_impl_item(impl_item)
         {
             return;
         }
@@ -439,7 +435,7 @@ impl<'tcx> MarkSymbolVisitor<'tcx> {
             }
             Node::ImplItem(impl_item) => {
                 let item = self.tcx.local_parent(impl_item.owner_id.def_id);
-                if self.tcx.impl_trait_ref(item).is_none() {
+                if let hir::ImplItemImplKind::Inherent { .. } = impl_item.impl_kind {
                     //// If it's a type whose items are live, then it's live, too.
                     //// This is done to handle the case where, for example, the static
                     //// method of a private type is used, but the type itself is never
diff --git a/compiler/rustc_passes/src/stability.rs b/compiler/rustc_passes/src/stability.rs
index 71650c6b9b9..7e11b7046d6 100644
--- a/compiler/rustc_passes/src/stability.rs
+++ b/compiler/rustc_passes/src/stability.rs
@@ -486,8 +486,7 @@ impl<'tcx> Visitor<'tcx> for MissingStabilityAnnotations<'tcx> {
 
     fn visit_impl_item(&mut self, ii: &'tcx hir::ImplItem<'tcx>) {
         self.check_compatible_stability(ii.owner_id.def_id);
-        let impl_def_id = self.tcx.hir_get_parent_item(ii.hir_id());
-        if self.tcx.impl_trait_ref(impl_def_id).is_none() {
+        if let hir::ImplItemImplKind::Inherent { .. } = ii.impl_kind {
             self.check_missing_stability(ii.owner_id.def_id);
             self.check_missing_const_stability(ii.owner_id.def_id);
         }
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
index cb84d583e6e..f2f840581cf 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
@@ -421,7 +421,7 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
                 })
                 | hir::Node::ImplItem(hir::ImplItem {
                     generics,
-                    trait_item_def_id: None,
+                    impl_kind: hir::ImplItemImplKind::Inherent { .. },
                     kind: hir::ImplItemKind::Fn(..),
                     ..
                 }) if finder.can_suggest_bound(generics) => {
diff --git a/compiler/rustc_ty_utils/src/assoc.rs b/compiler/rustc_ty_utils/src/assoc.rs
index 8587c952b91..7d257273c0a 100644
--- a/compiler/rustc_ty_utils/src/assoc.rs
+++ b/compiler/rustc_ty_utils/src/assoc.rs
@@ -2,7 +2,7 @@ use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, DefIdMap, LocalDefId};
 use rustc_hir::definitions::{DefPathData, DisambiguatorState};
 use rustc_hir::intravisit::{self, Visitor};
-use rustc_hir::{self as hir, ItemKind};
+use rustc_hir::{self as hir, ImplItemImplKind, ItemKind};
 use rustc_middle::query::Providers;
 use rustc_middle::ty::{self, ImplTraitInTraitData, TyCtxt};
 use rustc_middle::{bug, span_bug};
@@ -121,8 +121,11 @@ fn associated_item_from_impl_item(tcx: TyCtxt<'_>, impl_item: &hir::ImplItem<'_>
     ty::AssocItem {
         kind,
         def_id: owner_id.to_def_id(),
-        trait_item_def_id: impl_item.trait_item_def_id,
         container: ty::AssocContainer::Impl,
+        trait_item_def_id: match impl_item.impl_kind {
+            ImplItemImplKind::Inherent { .. } => None,
+            ImplItemImplKind::Trait { trait_item_def_id, .. } => trait_item_def_id.ok(),
+        },
     }
 }
 struct RPITVisitor<'a, 'tcx> {
@@ -190,7 +193,10 @@ fn associated_types_for_impl_traits_in_trait_or_impl<'tcx>(
                     }
                     let did = item.owner_id.def_id.to_def_id();
                     let item = tcx.hir_impl_item(*item);
-                    let Some(trait_item_def_id) = item.trait_item_def_id else {
+                    let ImplItemImplKind::Trait {
+                        trait_item_def_id: Ok(trait_item_def_id), ..
+                    } = item.impl_kind
+                    else {
                         return Some((did, vec![]));
                     };
                     let iter = in_trait_def[&trait_item_def_id].iter().map(|&id| {
diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs
index 31512571538..b3f2bb6d4b5 100644
--- a/compiler/rustc_ty_utils/src/ty.rs
+++ b/compiler/rustc_ty_utils/src/ty.rs
@@ -88,8 +88,15 @@ fn defaultness(tcx: TyCtxt<'_>, def_id: LocalDefId) -> hir::Defaultness {
                 }),
             ..
         })
-        | hir::Node::ImplItem(hir::ImplItem { defaultness, .. })
+        | hir::Node::ImplItem(hir::ImplItem {
+            impl_kind: hir::ImplItemImplKind::Trait { defaultness, .. },
+            ..
+        })
         | hir::Node::TraitItem(hir::TraitItem { defaultness, .. }) => *defaultness,
+        hir::Node::ImplItem(hir::ImplItem {
+            impl_kind: hir::ImplItemImplKind::Inherent { .. },
+            ..
+        }) => hir::Defaultness::Final,
         node => {
             bug!("`defaultness` called on {:?}", node);
         }
diff --git a/src/tools/clippy/clippy_lints/src/disallowed_macros.rs b/src/tools/clippy/clippy_lints/src/disallowed_macros.rs
index 23e7c7251cf..49cd2671dc0 100644
--- a/src/tools/clippy/clippy_lints/src/disallowed_macros.rs
+++ b/src/tools/clippy/clippy_lints/src/disallowed_macros.rs
@@ -8,7 +8,7 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefIdMap;
 use rustc_hir::{
-    AmbigArg, Expr, ExprKind, ForeignItem, HirId, ImplItem, Item, ItemKind, OwnerId, Pat, Path, Stmt, TraitItem, Ty,
+    AmbigArg, Expr, ExprKind, ForeignItem, HirId, ImplItem, ImplItemImplKind, Item, ItemKind, OwnerId, Pat, Path, Stmt, TraitItem, Ty,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::TyCtxt;
@@ -177,7 +177,9 @@ impl LateLintPass<'_> for DisallowedMacros {
 
     fn check_impl_item(&mut self, cx: &LateContext<'_>, item: &ImplItem<'_>) {
         self.check(cx, item.span, None);
-        self.check(cx, item.vis_span, None);
+        if let ImplItemImplKind::Inherent { vis_span, .. } = item.impl_kind {
+            self.check(cx, vis_span, None);
+        }
     }
 
     fn check_trait_item(&mut self, cx: &LateContext<'_>, item: &TraitItem<'_>) {
diff --git a/src/tools/clippy/clippy_lints/src/manual_async_fn.rs b/src/tools/clippy/clippy_lints/src/manual_async_fn.rs
index ba1ad599e11..bee3b19b597 100644
--- a/src/tools/clippy/clippy_lints/src/manual_async_fn.rs
+++ b/src/tools/clippy/clippy_lints/src/manual_async_fn.rs
@@ -4,7 +4,7 @@ use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{
     Block, Body, Closure, ClosureKind, CoroutineDesugaring, CoroutineKind, CoroutineSource, Expr, ExprKind, FnDecl,
-    FnRetTy, GenericBound, ImplItem, Item, Node, OpaqueTy, TraitRef, Ty, TyKind,
+    FnRetTy, GenericBound, Node, OpaqueTy, TraitRef, Ty, TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::middle::resolve_bound_vars::ResolvedArg;
@@ -60,8 +60,11 @@ impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn {
             && let ExprKind::Block(block, _) = body.value.kind
             && block.stmts.is_empty()
             && let Some(closure_body) = desugared_async_block(cx, block)
-            && let Node::Item(Item {vis_span, ..}) | Node::ImplItem(ImplItem {vis_span, ..}) =
-                cx.tcx.hir_node_by_def_id(fn_def_id)
+            && let Some(vis_span_opt) = match cx.tcx.hir_node_by_def_id(fn_def_id) {
+                Node::Item(item) => Some(Some(item.vis_span)),
+                Node::ImplItem(impl_item) => Some(impl_item.vis_span()),
+                _ => None,
+            }
             && !span.from_expansion()
         {
             let header_span = span.with_hi(ret_ty.span.hi());
@@ -72,7 +75,8 @@ impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn {
                 header_span,
                 "this function can be simplified using the `async fn` syntax",
                 |diag| {
-                    if let Some(vis_snip) = vis_span.get_source_text(cx)
+                    if let Some(vis_span) = vis_span_opt
+                        && let Some(vis_snip) = vis_span.get_source_text(cx)
                         && let Some(header_snip) = header_span.get_source_text(cx)
                         && let Some(ret_pos) = position_before_rarrow(&header_snip)
                         && let Some((_, ret_snip)) = suggested_ret(cx, output)
diff --git a/src/tools/clippy/clippy_lints/src/min_ident_chars.rs b/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
index dbce29a8631..6258e408217 100644
--- a/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
+++ b/src/tools/clippy/clippy_lints/src/min_ident_chars.rs
@@ -5,8 +5,8 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::{Visitor, walk_item, walk_trait_item};
 use rustc_hir::{
-    GenericParamKind, HirId, Impl, ImplItem, ImplItemKind, Item, ItemKind, ItemLocalId, Node, Pat, PatKind, TraitItem,
-    UsePath,
+    GenericParamKind, HirId, Impl, ImplItem, ImplItemImplKind, ImplItemKind, Item, ItemKind, ItemLocalId, Node, Pat,
+    PatKind, TraitItem, UsePath,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_session::impl_lint_pass;
@@ -256,7 +256,7 @@ fn is_not_in_trait_impl(cx: &LateContext<'_>, pat: &Pat<'_>, ident: Ident) -> bo
 }
 
 fn get_param_name(impl_item: &ImplItem<'_>, cx: &LateContext<'_>, ident: Ident) -> Option<Symbol> {
-    if let Some(trait_item_def_id) = impl_item.trait_item_def_id {
+    if let ImplItemImplKind::Trait { trait_item_def_id: Ok(trait_item_def_id), .. } = impl_item.impl_kind {
         let trait_param_names = cx.tcx.fn_arg_idents(trait_item_def_id);
 
         let ImplItemKind::Fn(_, body_id) = impl_item.kind else {
diff --git a/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs b/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
index a6be7581c9a..a63ad978626 100644
--- a/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
+++ b/src/tools/clippy/clippy_lints/src/missing_const_for_fn.rs
@@ -158,13 +158,23 @@ impl<'tcx> LateLintPass<'tcx> for MissingConstForFn {
         let mir = cx.tcx.optimized_mir(def_id);
 
         if let Ok(()) = is_min_const_fn(cx, mir, self.msrv)
-            && let hir::Node::Item(hir::Item { vis_span, .. }) | hir::Node::ImplItem(hir::ImplItem { vis_span, .. }) =
-                cx.tcx.hir_node_by_def_id(def_id)
+            && let node = cx.tcx.hir_node_by_def_id(def_id)
+            && let Some((item_span, vis_span_opt)) = match node {
+                hir::Node::Item(item) => Some((item.span, Some(item.vis_span))),
+                hir::Node::ImplItem(impl_item) => Some((impl_item.span, impl_item.vis_span())),
+                _ => None,
+            }
         {
-            let suggestion = if vis_span.is_empty() { "const " } else { " const" };
+            let (sugg_span, suggestion) = if let Some(vis_span) = vis_span_opt
+                && !vis_span.is_empty()
+            {
+                (vis_span.shrink_to_hi(), " const")
+            } else {
+                (item_span.shrink_to_lo(), "const ")
+            };
             span_lint_and_then(cx, MISSING_CONST_FOR_FN, span, "this could be a `const fn`", |diag| {
                 diag.span_suggestion_verbose(
-                    vis_span.shrink_to_hi(),
+                    sugg_span,
                     "make the function `const`",
                     suggestion,
                     Applicability::MachineApplicable,
diff --git a/src/tools/clippy/clippy_utils/src/check_proc_macro.rs b/src/tools/clippy/clippy_utils/src/check_proc_macro.rs
index c4a759e919b..1a25c90d735 100644
--- a/src/tools/clippy/clippy_utils/src/check_proc_macro.rs
+++ b/src/tools/clippy/clippy_utils/src/check_proc_macro.rs
@@ -19,7 +19,7 @@ use rustc_ast::token::CommentKind;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{
     Block, BlockCheckMode, Body, Closure, Destination, Expr, ExprKind, FieldDef, FnHeader, FnRetTy, HirId, Impl,
-    ImplItem, ImplItemKind, IsAuto, Item, ItemKind, Lit, LoopSource, MatchSource, MutTy, Node, Path, QPath, Safety,
+    ImplItem, ImplItemImplKind, ImplItemKind, IsAuto, Item, ItemKind, Lit, LoopSource, MatchSource, MutTy, Node, Path, QPath, Safety,
     TraitImplHeader, TraitItem, TraitItemKind, Ty, TyKind, UnOp, UnsafeSource, Variant, VariantData, YieldSource,
 };
 use rustc_lint::{EarlyContext, LateContext, LintContext};
@@ -280,16 +280,17 @@ fn trait_item_search_pat(item: &TraitItem<'_>) -> (Pat, Pat) {
 }
 
 fn impl_item_search_pat(item: &ImplItem<'_>) -> (Pat, Pat) {
-    let (start_pat, end_pat) = match &item.kind {
+    let (mut start_pat, end_pat) = match &item.kind {
         ImplItemKind::Const(..) => (Pat::Str("const"), Pat::Str(";")),
         ImplItemKind::Type(..) => (Pat::Str("type"), Pat::Str(";")),
         ImplItemKind::Fn(sig, ..) => (fn_header_search_pat(sig.header), Pat::Str("")),
     };
-    if item.vis_span.is_empty() {
-        (start_pat, end_pat)
-    } else {
-        (Pat::Str("pub"), end_pat)
-    }
+    if let ImplItemImplKind::Inherent { vis_span, .. } = item.impl_kind
+        && !vis_span.is_empty()
+    {
+        start_pat = Pat::Str("pub");
+    };
+    (start_pat, end_pat)
 }
 
 fn field_def_search_pat(def: &FieldDef<'_>) -> (Pat, Pat) {
@@ -313,21 +314,20 @@ fn variant_search_pat(v: &Variant<'_>) -> (Pat, Pat) {
 }
 
 fn fn_kind_pat(tcx: TyCtxt<'_>, kind: &FnKind<'_>, body: &Body<'_>, hir_id: HirId) -> (Pat, Pat) {
-    let (start_pat, end_pat) = match kind {
+    let (mut start_pat, end_pat) = match kind {
         FnKind::ItemFn(.., header) => (fn_header_search_pat(*header), Pat::Str("")),
         FnKind::Method(.., sig) => (fn_header_search_pat(sig.header), Pat::Str("")),
         FnKind::Closure => return (Pat::Str(""), expr_search_pat(tcx, body.value).1),
     };
-    let start_pat = match tcx.hir_node(hir_id) {
-        Node::Item(Item { vis_span, .. }) | Node::ImplItem(ImplItem { vis_span, .. }) => {
-            if vis_span.is_empty() {
-                start_pat
-            } else {
-                Pat::Str("pub")
+    match tcx.hir_node(hir_id) {
+        Node::Item(Item { vis_span, .. })
+        | Node::ImplItem(ImplItem { impl_kind: ImplItemImplKind::Inherent { vis_span, .. }, .. }) => {
+            if !vis_span.is_empty() {
+                start_pat = Pat::Str("pub")
             }
         },
-        Node::TraitItem(_) => start_pat,
-        _ => Pat::Str(""),
+        Node::ImplItem(_) | Node::TraitItem(_) => {},
+        _ => start_pat = Pat::Str(""),
     };
     (start_pat, end_pat)
 }