Auto merge of #12507 - Alexendoo:unused-qualifications, r=dswij

Enable unused_qualifications lint

Fixes a common nit

changelog: none

clippy_config/src/lib.rs

@@ -1,6 +1,12 @@
 #![feature(rustc_private, let_chains)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
-#![warn(rust_2018_idioms, unused_lifetimes)]
+#![warn(
+    trivial_casts,
+    trivial_numeric_casts,
+    rust_2018_idioms,
+    unused_lifetimes,
+    unused_qualifications
+)]
 #![allow(
     clippy::must_use_candidate,
     clippy::missing_panics_doc,

clippy_dev/src/lib.rs

@@ -2,8 +2,13 @@
 #![feature(let_chains)]
 #![feature(rustc_private)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
-// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(
-#![warn(rust_2018_idioms, unused_lifetimes)]
+    trivial_casts,
+    trivial_numeric_casts,
+    rust_2018_idioms,
+    unused_lifetimes,
+    unused_qualifications
+)]
 
 // The `rustc_driver` crate seems to be required in order to use the `rust_lexer` crate.
 #[allow(unused_extern_crates)]

clippy_dev/src/update_lints.rs

@@ -992,7 +992,7 @@ fn replace_region_in_text<'a>(
 }
 
 fn try_rename_file(old_name: &Path, new_name: &Path) -> bool {
-    match fs::OpenOptions::new().create_new(true).write(true).open(new_name) {
+    match OpenOptions::new().create_new(true).write(true).open(new_name) {
         Ok(file) => drop(file),
         Err(e) if matches!(e.kind(), io::ErrorKind::AlreadyExists | io::ErrorKind::NotFound) => return false,
         Err(e) => panic_file(e, new_name, "create"),
@@ -1016,7 +1016,7 @@ fn panic_file(error: io::Error, name: &Path, action: &str) -> ! {
 }
 
 fn rewrite_file(path: &Path, f: impl FnOnce(&str) -> Option<String>) {
-    let mut file = fs::OpenOptions::new()
+    let mut file = OpenOptions::new()
         .write(true)
         .read(true)
         .open(path)

clippy_lints/src/assigning_clones.rs

@@ -65,7 +65,7 @@ impl AssigningClones {
 impl_lint_pass!(AssigningClones => [ASSIGNING_CLONES]);
 
 impl<'tcx> LateLintPass<'tcx> for AssigningClones {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, assign_expr: &'tcx hir::Expr<'_>) {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, assign_expr: &'tcx Expr<'_>) {
         // Do not fire the lint in macros
         let expn_data = assign_expr.span().ctxt().outer_expn_data();
         match expn_data.kind {
@@ -205,12 +205,7 @@ fn is_ok_to_suggest<'tcx>(cx: &LateContext<'tcx>, lhs: &Expr<'tcx>, call: &CallC
     implemented_fns.contains_key(&provided_fn.def_id)
 }
 
-fn suggest<'tcx>(
+fn suggest<'tcx>(cx: &LateContext<'tcx>, assign_expr: &Expr<'tcx>, lhs: &Expr<'tcx>, call: &CallCandidate<'tcx>) {
-    cx: &LateContext<'tcx>,
-    assign_expr: &hir::Expr<'tcx>,
-    lhs: &hir::Expr<'tcx>,
-    call: &CallCandidate<'tcx>,
-) {
     span_lint_and_then(cx, ASSIGNING_CLONES, assign_expr.span, call.message(), |diag| {
         let mut applicability = Applicability::MachineApplicable;
 
@@ -263,7 +258,7 @@ impl<'tcx> CallCandidate<'tcx> {
     fn suggested_replacement(
         &self,
         cx: &LateContext<'tcx>,
-        lhs: &hir::Expr<'tcx>,
+        lhs: &Expr<'tcx>,
         applicability: &mut Applicability,
     ) -> String {
         match self.target {

clippy_lints/src/booleans.rs

@@ -392,13 +392,13 @@ fn simple_negate(b: Bool) -> Bool {
         t @ Term(_) => Not(Box::new(t)),
         And(mut v) => {
             for el in &mut v {
-                *el = simple_negate(::std::mem::replace(el, True));
+                *el = simple_negate(std::mem::replace(el, True));
             }
             Or(v)
         },
         Or(mut v) => {
             for el in &mut v {
-                *el = simple_negate(::std::mem::replace(el, True));
+                *el = simple_negate(std::mem::replace(el, True));
             }
             And(v)
         },

clippy_lints/src/box_default.rs

@@ -127,7 +127,7 @@ fn is_local_vec_expn(cx: &LateContext<'_>, expr: &Expr<'_>, ref_expr: &Expr<'_>)
 struct InferVisitor(bool);
 
 impl<'tcx> Visitor<'tcx> for InferVisitor {
-    fn visit_ty(&mut self, t: &rustc_hir::Ty<'_>) {
+    fn visit_ty(&mut self, t: &Ty<'_>) {
         self.0 |= matches!(t.kind, TyKind::Infer | TyKind::OpaqueDef(..) | TyKind::TraitObject(..));
         if !self.0 {
             walk_ty(self, t);

clippy_lints/src/collection_is_never_read.rs

@@ -70,7 +70,7 @@ impl<'tcx> LateLintPass<'tcx> for CollectionIsNeverRead {
     }
 }
 
-fn match_acceptable_type(cx: &LateContext<'_>, local: &Local<'_>, collections: &[rustc_span::Symbol]) -> bool {
+fn match_acceptable_type(cx: &LateContext<'_>, local: &Local<'_>, collections: &[Symbol]) -> bool {
     let ty = cx.typeck_results().pat_ty(local.pat);
     collections.iter().any(|&sym| is_type_diagnostic_item(cx, ty, sym))
     // String type is a lang item but not a diagnostic item for now so we need a separate check

clippy_lints/src/default_constructed_unit_structs.rs

@@ -56,7 +56,7 @@ fn is_alias(ty: hir::Ty<'_>) -> bool {
 
 impl LateLintPass<'_> for DefaultConstructedUnitStructs {
     fn check_expr<'tcx>(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
-        if let hir::ExprKind::Call(fn_expr, &[]) = expr.kind
+        if let ExprKind::Call(fn_expr, &[]) = expr.kind
             // make sure we have a call to `Default::default`
             && let ExprKind::Path(ref qpath @ hir::QPath::TypeRelative(base, _)) = fn_expr.kind
             // make sure this isn't a type alias:

clippy_lints/src/default_instead_of_iter_empty.rs

@@ -60,7 +60,7 @@ impl<'tcx> LateLintPass<'tcx> for DefaultIterEmpty {
 
 fn make_sugg(
     cx: &LateContext<'_>,
-    ty_path: &rustc_hir::QPath<'_>,
+    ty_path: &QPath<'_>,
     ctxt: SyntaxContext,
     applicability: &mut Applicability,
     path: &str,

clippy_lints/src/derivable_impls.rs

@@ -79,7 +79,7 @@ fn is_path_self(e: &Expr<'_>) -> bool {
 fn contains_trait_object(ty: Ty<'_>) -> bool {
     match ty.kind() {
         ty::Ref(_, ty, _) => contains_trait_object(*ty),
-        ty::Adt(def, args) => def.is_box() && args[0].as_type().map_or(false, contains_trait_object),
+        Adt(def, args) => def.is_box() && args[0].as_type().map_or(false, contains_trait_object),
         ty::Dynamic(..) => true,
         _ => false,
     }

clippy_lints/src/escape.rs

@@ -177,7 +177,7 @@ impl<'a, 'tcx> Delegate<'tcx> for EscapeDelegate<'a, 'tcx> {
         }
     }
 
-    fn fake_read(&mut self, _: &rustc_hir_typeck::expr_use_visitor::PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
+    fn fake_read(&mut self, _: &PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
 }
 
 impl<'a, 'tcx> EscapeDelegate<'a, 'tcx> {

clippy_lints/src/eta_reduction.rs

@@ -3,7 +3,7 @@ use clippy_utils::higher::VecArgs;
 use clippy_utils::source::snippet_opt;
 use clippy_utils::ty::type_diagnostic_name;
 use clippy_utils::usage::{local_used_after_expr, local_used_in};
-use clippy_utils::{get_path_from_caller_to_method_type, higher, is_adjusted, path_to_local, path_to_local_id};
+use clippy_utils::{get_path_from_caller_to_method_type, is_adjusted, path_to_local, path_to_local_id};
 use rustc_errors::Applicability;
 use rustc_hir::{BindingAnnotation, Expr, ExprKind, FnRetTy, Param, PatKind, QPath, TyKind, Unsafety};
 use rustc_infer::infer::TyCtxtInferExt;
@@ -88,7 +88,7 @@ impl<'tcx> LateLintPass<'tcx> for EtaReduction {
 
         if body.value.span.from_expansion() {
             if body.params.is_empty() {
-                if let Some(VecArgs::Vec(&[])) = higher::VecArgs::hir(cx, body.value) {
+                if let Some(VecArgs::Vec(&[])) = VecArgs::hir(cx, body.value) {
                     // replace `|| vec![]` with `Vec::new`
                     span_lint_and_sugg(
                         cx,

clippy_lints/src/floating_point_arithmetic.rs

@@ -552,9 +552,9 @@ fn is_testing_negative(cx: &LateContext<'_>, expr: &Expr<'_>, test: &Expr<'_>) -
 /// Returns true iff expr is some zero literal
 fn is_zero(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     match constant_simple(cx, cx.typeck_results(), expr) {
-        Some(Constant::Int(i)) => i == 0,
+        Some(Int(i)) => i == 0,
-        Some(Constant::F32(f)) => f == 0.0,
+        Some(F32(f)) => f == 0.0,
-        Some(Constant::F64(f)) => f == 0.0,
+        Some(F64(f)) => f == 0.0,
         _ => false,
     }
 }

clippy_lints/src/functions/result.rs

@@ -2,7 +2,7 @@ use rustc_errors::Diag;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LintContext};
 use rustc_middle::lint::in_external_macro;
-use rustc_middle::ty::{self, Adt, Ty};
+use rustc_middle::ty::{Adt, Ty};
 use rustc_span::{sym, Span};
 
 use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_then};
@@ -25,7 +25,7 @@ fn result_err_ty<'tcx>(
             .tcx
             .instantiate_bound_regions_with_erased(cx.tcx.fn_sig(id).instantiate_identity().output())
         && is_type_diagnostic_item(cx, ty, sym::Result)
-        && let ty::Adt(_, args) = ty.kind()
+        && let Adt(_, args) = ty.kind()
     {
         let err_ty = args.type_at(1);
         Some((hir_ty, err_ty))

clippy_lints/src/implied_bounds_in_impls.rs

@@ -56,7 +56,7 @@ fn emit_lint(
     index: usize,
     // The bindings that were implied, used for suggestion purposes since removing a bound with associated types
     // means we might need to then move it to a different bound
-    implied_bindings: &[rustc_hir::TypeBinding<'_>],
+    implied_bindings: &[TypeBinding<'_>],
     bound: &ImplTraitBound<'_>,
 ) {
     let implied_by = snippet(cx, bound.span, "..");

clippy_lints/src/instant_subtraction.rs

@@ -1,5 +1,5 @@
 use clippy_config::msrvs::{self, Msrv};
-use clippy_utils::diagnostics::{self, span_lint_and_sugg};
+use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_context;
 use clippy_utils::sugg::Sugg;
 use clippy_utils::ty;
@@ -149,7 +149,7 @@ fn print_unchecked_duration_subtraction_sugg(
     let left_expr = snippet_with_context(cx, left_expr.span, ctxt, "<instant>", &mut applicability).0;
     let right_expr = snippet_with_context(cx, right_expr.span, ctxt, "<duration>", &mut applicability).0;
 
-    diagnostics::span_lint_and_sugg(
+    span_lint_and_sugg(
         cx,
         UNCHECKED_DURATION_SUBTRACTION,
         expr.span,

clippy_lints/src/invalid_upcast_comparisons.rs

@@ -88,7 +88,7 @@ fn err_upcast_comparison(cx: &LateContext<'_>, span: Span, expr: &Expr<'_>, alwa
 fn upcast_comparison_bounds_err<'tcx>(
     cx: &LateContext<'tcx>,
     span: Span,
-    rel: comparisons::Rel,
+    rel: Rel,
     lhs_bounds: Option<(FullInt, FullInt)>,
     lhs: &'tcx Expr<'_>,
     rhs: &'tcx Expr<'_>,

clippy_lints/src/len_zero.rs

@@ -256,7 +256,7 @@ fn check_trait_items(cx: &LateContext<'_>, visited_trait: &Item<'_>, trait_items
             .items()
             .flat_map(|&i| cx.tcx.associated_items(i).filter_by_name_unhygienic(is_empty))
             .any(|i| {
-                i.kind == ty::AssocKind::Fn
+                i.kind == AssocKind::Fn
                     && i.fn_has_self_parameter
                     && cx.tcx.fn_sig(i.def_id).skip_binder().inputs().skip_binder().len() == 1
             });
@@ -594,7 +594,7 @@ fn is_empty_array(expr: &Expr<'_>) -> bool {
 fn has_is_empty(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     /// Gets an `AssocItem` and return true if it matches `is_empty(self)`.
     fn is_is_empty(cx: &LateContext<'_>, item: &ty::AssocItem) -> bool {
-        if item.kind == ty::AssocKind::Fn {
+        if item.kind == AssocKind::Fn {
             let sig = cx.tcx.fn_sig(item.def_id).skip_binder();
             let ty = sig.skip_binder();
             ty.inputs().len() == 1

clippy_lints/src/lib.rs

@@ -16,11 +16,14 @@
     rustc::diagnostic_outside_of_impl,
     rustc::untranslatable_diagnostic
 )]
-#![warn(trivial_casts, trivial_numeric_casts)]
+#![warn(
-// warn on lints, that are included in `rust-lang/rust`s bootstrap
+    trivial_casts,
-#![warn(rust_2018_idioms, unused_lifetimes)]
+    trivial_numeric_casts,
-// warn on rustc internal lints
+    rust_2018_idioms,
-#![warn(rustc::internal)]
+    unused_lifetimes,
+    unused_qualifications,
+    rustc::internal
+)]
 // Disable this rustc lint for now, as it was also done in rustc
 #![allow(rustc::potential_query_instability)]
 

clippy_lints/src/literal_representation.rs

@@ -158,7 +158,7 @@ enum WarningType {
 }
 
 impl WarningType {
-    fn display(&self, suggested_format: String, cx: &EarlyContext<'_>, span: rustc_span::Span) {
+    fn display(&self, suggested_format: String, cx: &EarlyContext<'_>, span: Span) {
         match self {
             Self::MistypedLiteralSuffix => span_lint_and_sugg(
                 cx,
@@ -302,11 +302,7 @@ impl LiteralDigitGrouping {
     }
 
     // Returns `false` if the check fails
-    fn check_for_mistyped_suffix(
+    fn check_for_mistyped_suffix(cx: &EarlyContext<'_>, span: Span, num_lit: &mut NumericLiteral<'_>) -> bool {
-        cx: &EarlyContext<'_>,
-        span: rustc_span::Span,
-        num_lit: &mut NumericLiteral<'_>,
-    ) -> bool {
         if num_lit.suffix.is_some() {
             return true;
         }

clippy_lints/src/loops/mut_range_bound.rs

@@ -109,7 +109,7 @@ impl<'tcx> Delegate<'tcx> for MutatePairDelegate<'_, 'tcx> {
         }
     }
 
-    fn fake_read(&mut self, _: &rustc_hir_typeck::expr_use_visitor::PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
+    fn fake_read(&mut self, _: &PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
 }
 
 impl MutatePairDelegate<'_, '_> {
@@ -141,7 +141,7 @@ impl BreakAfterExprVisitor {
     }
 }
 
-impl<'tcx> intravisit::Visitor<'tcx> for BreakAfterExprVisitor {
+impl<'tcx> Visitor<'tcx> for BreakAfterExprVisitor {
     fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
         if self.past_candidate {
             return;

clippy_lints/src/loops/needless_range_loop.rs

@@ -357,7 +357,7 @@ impl<'a, 'tcx> Visitor<'tcx> for VarVisitor<'a, 'tcx> {
                 let def_id = self.cx.typeck_results().type_dependent_def_id(expr.hir_id).unwrap();
                 for (ty, expr) in iter::zip(
                     self.cx.tcx.fn_sig(def_id).instantiate_identity().inputs().skip_binder(),
-                    std::iter::once(receiver).chain(args.iter()),
+                    iter::once(receiver).chain(args.iter()),
                 ) {
                     self.prefer_mutable = false;
                     if let ty::Ref(_, _, mutbl) = *ty.kind() {

clippy_lints/src/loops/never_loop.rs

@@ -159,12 +159,9 @@ fn never_loop_expr<'tcx>(
         | ExprKind::DropTemps(e) => never_loop_expr(cx, e, local_labels, main_loop_id),
         ExprKind::Let(let_expr) => never_loop_expr(cx, let_expr.init, local_labels, main_loop_id),
         ExprKind::Array(es) | ExprKind::Tup(es) => never_loop_expr_all(cx, es.iter(), local_labels, main_loop_id),
-        ExprKind::MethodCall(_, receiver, es, _) => never_loop_expr_all(
+        ExprKind::MethodCall(_, receiver, es, _) => {
-            cx,
+            never_loop_expr_all(cx, once(receiver).chain(es.iter()), local_labels, main_loop_id)
-            std::iter::once(receiver).chain(es.iter()),
+        },
-            local_labels,
-            main_loop_id,
-        ),
         ExprKind::Struct(_, fields, base) => {
             let fields = never_loop_expr_all(cx, fields.iter().map(|f| f.expr), local_labels, main_loop_id);
             if let Some(base) = base {

clippy_lints/src/loops/single_element_loop.rs

@@ -42,7 +42,7 @@ pub(super) fn check<'tcx>(
             },
             [],
             _,
-        ) if method.ident.name == rustc_span::sym::iter => (arg, "&"),
+        ) if method.ident.name == sym::iter => (arg, "&"),
         ExprKind::MethodCall(
             method,
             Expr {
@@ -60,7 +60,7 @@ pub(super) fn check<'tcx>(
             },
             [],
             _,
-        ) if method.ident.name == rustc_span::sym::into_iter => (arg, ""),
+        ) if method.ident.name == sym::into_iter => (arg, ""),
         // Only check for arrays edition 2021 or later, as this case will trigger a compiler error otherwise.
         ExprKind::Array([arg]) if cx.tcx.sess.edition() >= Edition::Edition2021 => (arg, ""),
         _ => return,

clippy_lints/src/manual_bits.rs

@@ -139,7 +139,7 @@ fn is_ty_conversion(expr: &Expr<'_>) -> bool {
     if let ExprKind::Cast(..) = expr.kind {
         true
     } else if let ExprKind::MethodCall(path, _, [], _) = expr.kind
-        && path.ident.name == rustc_span::sym::try_into
+        && path.ident.name == sym::try_into
     {
         // This is only called for `usize` which implements `TryInto`. Therefore,
         // we don't have to check here if `self` implements the `TryInto` trait.

clippy_lints/src/methods/clear_with_drain.rs

@@ -2,7 +2,6 @@ use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::is_range_full;
 use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
 use rustc_errors::Applicability;
-use rustc_hir as hir;
 use rustc_hir::{Expr, ExprKind, LangItem, QPath};
 use rustc_lint::LateContext;
 use rustc_span::symbol::sym;
@@ -28,7 +27,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, span
     }
 }
 
-fn match_acceptable_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>, types: &[rustc_span::Symbol]) -> bool {
+fn match_acceptable_type(cx: &LateContext<'_>, expr: &Expr<'_>, types: &[rustc_span::Symbol]) -> bool {
     let expr_ty = cx.typeck_results().expr_ty(expr).peel_refs();
     types.iter().any(|&ty| is_type_diagnostic_item(cx, expr_ty, ty))
     // String type is a lang item but not a diagnostic item for now so we need a separate check

clippy_lints/src/methods/filter_map.rs

@@ -16,20 +16,18 @@ use std::borrow::Cow;
 
 use super::{MANUAL_FILTER_MAP, MANUAL_FIND_MAP, OPTION_FILTER_MAP, RESULT_FILTER_MAP};
 
-fn is_method(cx: &LateContext<'_>, expr: &hir::Expr<'_>, method_name: Symbol) -> bool {
+fn is_method(cx: &LateContext<'_>, expr: &Expr<'_>, method_name: Symbol) -> bool {
     match &expr.kind {
-        hir::ExprKind::Path(QPath::TypeRelative(_, mname)) => mname.ident.name == method_name,
+        ExprKind::Path(QPath::TypeRelative(_, mname)) => mname.ident.name == method_name,
-        hir::ExprKind::Path(QPath::Resolved(_, segments)) => {
+        ExprKind::Path(QPath::Resolved(_, segments)) => segments.segments.last().unwrap().ident.name == method_name,
-            segments.segments.last().unwrap().ident.name == method_name
+        ExprKind::MethodCall(segment, _, _, _) => segment.ident.name == method_name,
-        },
+        ExprKind::Closure(&Closure { body, .. }) => {
-        hir::ExprKind::MethodCall(segment, _, _, _) => segment.ident.name == method_name,
-        hir::ExprKind::Closure(&hir::Closure { body, .. }) => {
             let body = cx.tcx.hir().body(body);
             let closure_expr = peel_blocks(body.value);
             match closure_expr.kind {
-                hir::ExprKind::MethodCall(hir::PathSegment { ident, .. }, receiver, ..) => {
+                ExprKind::MethodCall(PathSegment { ident, .. }, receiver, ..) => {
                     if ident.name == method_name
-                        && let hir::ExprKind::Path(path) = &receiver.kind
+                        && let ExprKind::Path(path) = &receiver.kind
                         && let Res::Local(ref local) = cx.qpath_res(path, receiver.hir_id)
                         && !body.params.is_empty()
                     {
@@ -45,10 +43,10 @@ fn is_method(cx: &LateContext<'_>, expr: &hir::Expr<'_>, method_name: Symbol) ->
     }
 }
 
-fn is_option_filter_map(cx: &LateContext<'_>, filter_arg: &hir::Expr<'_>, map_arg: &hir::Expr<'_>) -> bool {
+fn is_option_filter_map(cx: &LateContext<'_>, filter_arg: &Expr<'_>, map_arg: &Expr<'_>) -> bool {
     is_method(cx, map_arg, sym::unwrap) && is_method(cx, filter_arg, sym!(is_some))
 }
-fn is_ok_filter_map(cx: &LateContext<'_>, filter_arg: &hir::Expr<'_>, map_arg: &hir::Expr<'_>) -> bool {
+fn is_ok_filter_map(cx: &LateContext<'_>, filter_arg: &Expr<'_>, map_arg: &Expr<'_>) -> bool {
     is_method(cx, map_arg, sym::unwrap) && is_method(cx, filter_arg, sym!(is_ok))
 }
 
@@ -267,10 +265,10 @@ impl<'tcx> OffendingFilterExpr<'tcx> {
 /// is `filter(|x| x.is_some()).map(|x| x.unwrap())`
 fn is_filter_some_map_unwrap(
     cx: &LateContext<'_>,
-    expr: &hir::Expr<'_>,
+    expr: &Expr<'_>,
-    filter_recv: &hir::Expr<'_>,
+    filter_recv: &Expr<'_>,
-    filter_arg: &hir::Expr<'_>,
+    filter_arg: &Expr<'_>,
-    map_arg: &hir::Expr<'_>,
+    map_arg: &Expr<'_>,
 ) -> bool {
     let iterator = is_trait_method(cx, expr, sym::Iterator);
     let option = is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(filter_recv), sym::Option);
@@ -279,12 +277,7 @@ fn is_filter_some_map_unwrap(
 }
 
 /// is `filter(|x| x.is_ok()).map(|x| x.unwrap())`
-fn is_filter_ok_map_unwrap(
+fn is_filter_ok_map_unwrap(cx: &LateContext<'_>, expr: &Expr<'_>, filter_arg: &Expr<'_>, map_arg: &Expr<'_>) -> bool {
-    cx: &LateContext<'_>,
-    expr: &hir::Expr<'_>,
-    filter_arg: &hir::Expr<'_>,
-    map_arg: &hir::Expr<'_>,
-) -> bool {
     // result has no filter, so we only check for iterators
     let iterator = is_trait_method(cx, expr, sym::Iterator);
     iterator && is_ok_filter_map(cx, filter_arg, map_arg)
@@ -294,12 +287,12 @@ fn is_filter_ok_map_unwrap(
 #[allow(clippy::too_many_arguments)]
 pub(super) fn check(
     cx: &LateContext<'_>,
-    expr: &hir::Expr<'_>,
+    expr: &Expr<'_>,
-    filter_recv: &hir::Expr<'_>,
+    filter_recv: &Expr<'_>,
-    filter_arg: &hir::Expr<'_>,
+    filter_arg: &Expr<'_>,
     filter_span: Span,
-    map_recv: &hir::Expr<'_>,
+    map_recv: &Expr<'_>,
-    map_arg: &hir::Expr<'_>,
+    map_arg: &Expr<'_>,
     map_span: Span,
     is_find: bool,
 ) {
@@ -405,9 +398,9 @@ pub(super) fn check(
 
 fn is_find_or_filter<'a>(
     cx: &LateContext<'a>,
-    map_recv: &hir::Expr<'_>,
+    map_recv: &Expr<'_>,
-    filter_arg: &hir::Expr<'_>,
+    filter_arg: &Expr<'_>,
-    map_arg: &hir::Expr<'_>,
+    map_arg: &Expr<'_>,
 ) -> Option<(Ident, CheckResult<'a>)> {
     if is_trait_method(cx, map_recv, sym::Iterator)
         // filter(|x| ...is_some())...

clippy_lints/src/methods/iter_filter.rs

@@ -55,7 +55,7 @@ fn is_method(
         }
     }
     match expr.kind {
-        hir::ExprKind::MethodCall(hir::PathSegment { ident, .. }, recv, ..) => {
+        ExprKind::MethodCall(hir::PathSegment { ident, .. }, recv, ..) => {
             // compare the identifier of the receiver to the parameter
             // we are in a filter => closure has a single parameter and a single, non-block
             // expression, this means that the parameter shadows all outside variables with
@@ -73,7 +73,7 @@ fn is_method(
         // This is used to check for complete paths via `|a| std::option::Option::is_some(a)`
         // this then unwraps to a path with `QPath::TypeRelative`
         // we pass the params as they've been passed to the current call through the closure
-        hir::ExprKind::Call(expr, [param]) => {
+        ExprKind::Call(expr, [param]) => {
             // this will hit the `QPath::TypeRelative` case and check that the method name is correct
             if is_method(cx, expr, type_symbol, method_name, params)
                 // we then check that this is indeed passing the parameter of the closure
@@ -85,7 +85,7 @@ fn is_method(
             }
             false
         },
-        hir::ExprKind::Path(QPath::TypeRelative(ty, mname)) => {
+        ExprKind::Path(QPath::TypeRelative(ty, mname)) => {
             let ty = cx.typeck_results().node_type(ty.hir_id);
             if let Some(did) = cx.tcx.get_diagnostic_item(type_symbol)
                 && ty.ty_adt_def() == cx.tcx.type_of(did).skip_binder().ty_adt_def()
@@ -94,7 +94,7 @@ fn is_method(
             }
             false
         },
-        hir::ExprKind::Closure(&hir::Closure { body, .. }) => {
+        ExprKind::Closure(&hir::Closure { body, .. }) => {
             let body = cx.tcx.hir().body(body);
             let closure_expr = peel_blocks(body.value);
             let params = body.params.iter().map(|param| param.pat).collect::<Vec<_>>();
@@ -107,8 +107,8 @@ fn is_method(
 fn parent_is_map(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
     if let Some(expr) = get_parent_expr(cx, expr)
         && is_trait_method(cx, expr, sym::Iterator)
-        && let hir::ExprKind::MethodCall(path, _, _, _) = expr.kind
+        && let ExprKind::MethodCall(path, _, _, _) = expr.kind
-        && path.ident.name == rustc_span::sym::map
+        && path.ident.name == sym::map
     {
         return true;
     }
@@ -148,7 +148,7 @@ fn expression_type(
     {
         return None;
     }
-    if let hir::ExprKind::MethodCall(_, receiver, _, _) = expr.kind
+    if let ExprKind::MethodCall(_, receiver, _, _) = expr.kind
         && let receiver_ty = cx.typeck_results().expr_ty(receiver)
         && let Some(iter_item_ty) = get_iterator_item_ty(cx, receiver_ty)
     {

clippy_lints/src/methods/iter_overeager_cloned.rs

@@ -60,7 +60,7 @@ pub(super) fn check<'tcx>(
         }
 
         if let Op::NeedlessMove(expr) = op {
-            let rustc_hir::ExprKind::Closure(closure) = expr.kind else {
+            let ExprKind::Closure(closure) = expr.kind else {
                 return;
             };
             let body @ Body { params: [p], .. } = cx.tcx.hir().body(closure.body) else {

clippy_lints/src/methods/map_clone.rs

@@ -50,7 +50,7 @@ pub(super) fn check(cx: &LateContext<'_>, e: &hir::Expr<'_>, recv: &hir::Expr<'_
                 let closure_body = cx.tcx.hir().body(body);
                 let closure_expr = peel_blocks(closure_body.value);
                 match closure_body.params[0].pat.kind {
-                    hir::PatKind::Ref(inner, hir::Mutability::Not) => {
+                    hir::PatKind::Ref(inner, Mutability::Not) => {
                         if let hir::PatKind::Binding(hir::BindingAnnotation::NONE, .., name, None) = inner.kind {
                             if ident_eq(name, closure_expr) {
                                 lint_explicit_closure(cx, e.span, recv.span, true, msrv);

clippy_lints/src/methods/mod.rs

@@ -4240,8 +4240,8 @@ impl_lint_pass!(Methods => [
 
 /// Extracts a method call name, args, and `Span` of the method name.
 pub fn method_call<'tcx>(
-    recv: &'tcx hir::Expr<'tcx>,
+    recv: &'tcx Expr<'tcx>,
-) -> Option<(&'tcx str, &'tcx hir::Expr<'tcx>, &'tcx [hir::Expr<'tcx>], Span, Span)> {
+) -> Option<(&'tcx str, &'tcx Expr<'tcx>, &'tcx [Expr<'tcx>], Span, Span)> {
     if let ExprKind::MethodCall(path, receiver, args, call_span) = recv.kind {
         if !args.iter().any(|e| e.span.from_expansion()) && !receiver.span.from_expansion() {
             let name = path.ident.name.as_str();
@@ -4252,7 +4252,7 @@ pub fn method_call<'tcx>(
 }
 
 impl<'tcx> LateLintPass<'tcx> for Methods {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if expr.span.from_expansion() {
             return;
         }
@@ -4260,12 +4260,12 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
         self.check_methods(cx, expr);
 
         match expr.kind {
-            hir::ExprKind::Call(func, args) => {
+            ExprKind::Call(func, args) => {
                 from_iter_instead_of_collect::check(cx, expr, args, func);
                 unnecessary_fallible_conversions::check_function(cx, expr, func);
                 manual_c_str_literals::check(cx, expr, func, args, &self.msrv);
             },
-            hir::ExprKind::MethodCall(method_call, receiver, args, _) => {
+            ExprKind::MethodCall(method_call, receiver, args, _) => {
                 let method_span = method_call.ident.span;
                 or_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), receiver, args);
                 expect_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), receiver, args);
@@ -4277,7 +4277,7 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
                 single_char_pattern::check(cx, expr, method_call.ident.name, receiver, args);
                 unnecessary_to_owned::check(cx, expr, method_call.ident.name, receiver, args, &self.msrv);
             },
-            hir::ExprKind::Binary(op, lhs, rhs) if op.node == hir::BinOpKind::Eq || op.node == hir::BinOpKind::Ne => {
+            ExprKind::Binary(op, lhs, rhs) if op.node == hir::BinOpKind::Eq || op.node == hir::BinOpKind::Ne => {
                 let mut info = BinaryExprInfo {
                     expr,
                     chain: lhs,
@@ -4999,9 +4999,9 @@ fn check_is_some_is_none(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>,
 /// Used for `lint_binary_expr_with_method_call`.
 #[derive(Copy, Clone)]
 struct BinaryExprInfo<'a> {
-    expr: &'a hir::Expr<'a>,
+    expr: &'a Expr<'a>,
-    chain: &'a hir::Expr<'a>,
+    chain: &'a Expr<'a>,
-    other: &'a hir::Expr<'a>,
+    other: &'a Expr<'a>,
     eq: bool,
 }
 

clippy_lints/src/methods/needless_collect.rs

@@ -107,7 +107,7 @@ pub(super) fn check<'tcx>(
                 span.push_span_label(iter_call.span, "the iterator could be used here instead");
                 span_lint_hir_and_then(
                     cx,
-                    super::NEEDLESS_COLLECT,
+                    NEEDLESS_COLLECT,
                     collect_expr.hir_id,
                     span,
                     NEEDLESS_COLLECT_MSG,

clippy_lints/src/methods/search_is_some.rs

@@ -39,7 +39,7 @@ pub(super) fn check<'tcx>(
                 && let closure_body = cx.tcx.hir().body(body)
                 && let Some(closure_arg) = closure_body.params.first()
             {
-                if let hir::PatKind::Ref(..) = closure_arg.pat.kind {
+                if let PatKind::Ref(..) = closure_arg.pat.kind {
                     Some(search_snippet.replacen('&', "", 1))
                 } else if let PatKind::Binding(..) = strip_pat_refs(closure_arg.pat).kind {
                     // `find()` provides a reference to the item, but `any` does not,

clippy_lints/src/methods/utils.rs

@@ -3,7 +3,6 @@ use clippy_utils::ty::is_type_diagnostic_item;
 use clippy_utils::{get_parent_expr, path_to_local_id, usage};
 use rustc_ast::ast;
 use rustc_errors::Applicability;
-use rustc_hir as hir;
 use rustc_hir::intravisit::{walk_expr, Visitor};
 use rustc_hir::{BorrowKind, Expr, ExprKind, HirId, Mutability, Pat};
 use rustc_lint::LateContext;
@@ -13,9 +12,9 @@ use rustc_span::symbol::sym;
 
 pub(super) fn derefs_to_slice<'tcx>(
     cx: &LateContext<'tcx>,
-    expr: &'tcx hir::Expr<'tcx>,
+    expr: &'tcx Expr<'tcx>,
     ty: Ty<'tcx>,
-) -> Option<&'tcx hir::Expr<'tcx>> {
+) -> Option<&'tcx Expr<'tcx>> {
     fn may_slice<'a>(cx: &LateContext<'a>, ty: Ty<'a>) -> bool {
         match ty.kind() {
             ty::Slice(_) => true,
@@ -27,7 +26,7 @@ pub(super) fn derefs_to_slice<'tcx>(
         }
     }
 
-    if let hir::ExprKind::MethodCall(path, self_arg, ..) = &expr.kind {
+    if let ExprKind::MethodCall(path, self_arg, ..) = &expr.kind {
         if path.ident.name == sym::iter && may_slice(cx, cx.typeck_results().expr_ty(self_arg)) {
             Some(self_arg)
         } else {
@@ -51,10 +50,10 @@ pub(super) fn derefs_to_slice<'tcx>(
 
 pub(super) fn get_hint_if_single_char_arg(
     cx: &LateContext<'_>,
-    arg: &hir::Expr<'_>,
+    arg: &Expr<'_>,
     applicability: &mut Applicability,
 ) -> Option<String> {
-    if let hir::ExprKind::Lit(lit) = &arg.kind
+    if let ExprKind::Lit(lit) = &arg.kind
         && let ast::LitKind::Str(r, style) = lit.node
         && let string = r.as_str()
         && string.chars().count() == 1

clippy_lints/src/missing_fields_in_debug.rs

@@ -198,7 +198,7 @@ fn check_struct<'tcx>(
 }
 
 impl<'tcx> LateLintPass<'tcx> for MissingFieldsInDebug {
-    fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx rustc_hir::Item<'tcx>) {
+    fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
         // is this an `impl Debug for X` block?
         if let ItemKind::Impl(Impl { of_trait: Some(trait_ref), self_ty, items, .. }) = item.kind
             && let Res::Def(DefKind::Trait, trait_def_id) = trait_ref.path.res

clippy_lints/src/mut_reference.rs

@@ -60,7 +60,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryMutPassed {
                 let method_type = cx.tcx.type_of(def_id).instantiate(cx.tcx, args);
                 check_arguments(
                     cx,
-                    std::iter::once(receiver).chain(arguments.iter()).collect(),
+                    iter::once(receiver).chain(arguments.iter()).collect(),
                     method_type,
                     path.ident.as_str(),
                     "method",

clippy_lints/src/mutex_atomic.rs

@@ -92,8 +92,8 @@ impl<'tcx> LateLintPass<'tcx> for Mutex {
                          behavior and not the internal type, consider using `Mutex<()>`"
                     );
                     match *mutex_param.kind() {
-                        ty::Uint(t) if t != ty::UintTy::Usize => span_lint(cx, MUTEX_INTEGER, expr.span, &msg),
+                        ty::Uint(t) if t != UintTy::Usize => span_lint(cx, MUTEX_INTEGER, expr.span, &msg),
-                        ty::Int(t) if t != ty::IntTy::Isize => span_lint(cx, MUTEX_INTEGER, expr.span, &msg),
+                        ty::Int(t) if t != IntTy::Isize => span_lint(cx, MUTEX_INTEGER, expr.span, &msg),
                         _ => span_lint(cx, MUTEX_ATOMIC, expr.span, &msg),
                     };
                 }

clippy_lints/src/needless_borrows_for_generic_args.rs

@@ -381,7 +381,7 @@ fn replace_types<'tcx>(
     fn_sig: FnSig<'tcx>,
     arg_index: usize,
     projection_predicates: &[ProjectionPredicate<'tcx>],
-    args: &mut [ty::GenericArg<'tcx>],
+    args: &mut [GenericArg<'tcx>],
 ) -> bool {
     let mut replaced = BitSet::new_empty(args.len());
 
@@ -399,7 +399,7 @@ fn replace_types<'tcx>(
             return false;
         }
 
-        args[param_ty.index as usize] = ty::GenericArg::from(new_ty);
+        args[param_ty.index as usize] = GenericArg::from(new_ty);
 
         // The `replaced.insert(...)` check provides some protection against infinite loops.
         if replaced.insert(param_ty.index) {
@@ -414,7 +414,7 @@ fn replace_types<'tcx>(
                     ));
 
                     if let Ok(projected_ty) = cx.tcx.try_normalize_erasing_regions(cx.param_env, projection)
-                        && args[term_param_ty.index as usize] != ty::GenericArg::from(projected_ty)
+                        && args[term_param_ty.index as usize] != GenericArg::from(projected_ty)
                     {
                         deque.push_back((*term_param_ty, projected_ty));
                     }

clippy_lints/src/no_effect.rs

@@ -107,7 +107,7 @@ impl<'tcx> LateLintPass<'tcx> for NoEffect {
         }
     }
 
-    fn check_expr(&mut self, _: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tcx>) {
+    fn check_expr(&mut self, _: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
         if let Some(def_id) = path_to_local(expr) {
             // FIXME(rust/#120456) - is `swap_remove` correct?
             self.underscore_bindings.swap_remove(&def_id);

clippy_lints/src/non_copy_const.rs

@@ -285,7 +285,7 @@ impl NonCopyConst {
         let def_id = body_id.hir_id.owner.to_def_id();
         let args = ty::GenericArgs::identity_for_item(cx.tcx, def_id);
         let instance = ty::Instance::new(def_id, args);
-        let cid = rustc_middle::mir::interpret::GlobalId {
+        let cid = GlobalId {
             instance,
             promoted: None,
         };
@@ -534,7 +534,7 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
     }
 }
 
-fn ignored_macro(cx: &LateContext<'_>, it: &rustc_hir::Item<'_>) -> bool {
+fn ignored_macro(cx: &LateContext<'_>, it: &Item<'_>) -> bool {
     macro_backtrace(it.span).any(|macro_call| {
         matches!(
             cx.tcx.get_diagnostic_name(macro_call.def_id),

clippy_lints/src/ptr.rs

@@ -628,7 +628,7 @@ fn check_ptr_arg_usage<'tcx>(cx: &LateContext<'tcx>, body: &'tcx Body<'_>, args:
                         }
                     },
                     ExprKind::MethodCall(name, self_arg, expr_args, _) => {
-                        let i = std::iter::once(self_arg)
+                        let i = iter::once(self_arg)
                             .chain(expr_args.iter())
                             .position(|arg| arg.hir_id == child_id)
                             .unwrap_or(0);

clippy_lints/src/question_mark.rs

@@ -306,9 +306,9 @@ impl QuestionMark {
     }
 }
 
-fn is_try_block(cx: &LateContext<'_>, bl: &rustc_hir::Block<'_>) -> bool {
+fn is_try_block(cx: &LateContext<'_>, bl: &Block<'_>) -> bool {
     if let Some(expr) = bl.expr
-        && let rustc_hir::ExprKind::Call(callee, _) = expr.kind
+        && let ExprKind::Call(callee, _) = expr.kind
     {
         is_path_lang_item(cx, callee, LangItem::TryTraitFromOutput)
     } else {
@@ -337,7 +337,7 @@ impl<'tcx> LateLintPass<'tcx> for QuestionMark {
         }
     }
 
-    fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx rustc_hir::Block<'tcx>) {
+    fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) {
         if is_try_block(cx, block) {
             *self
                 .try_block_depth_stack
@@ -354,7 +354,7 @@ impl<'tcx> LateLintPass<'tcx> for QuestionMark {
         self.try_block_depth_stack.pop();
     }
 
-    fn check_block_post(&mut self, cx: &LateContext<'tcx>, block: &'tcx rustc_hir::Block<'tcx>) {
+    fn check_block_post(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) {
         if is_try_block(cx, block) {
             *self
                 .try_block_depth_stack

clippy_lints/src/redundant_closure_call.rs

@@ -56,7 +56,7 @@ impl ReturnVisitor {
 
 impl<'tcx> Visitor<'tcx> for ReturnVisitor {
     fn visit_expr(&mut self, ex: &'tcx hir::Expr<'tcx>) {
-        if let hir::ExprKind::Ret(_) | hir::ExprKind::Match(.., hir::MatchSource::TryDesugar(_)) = ex.kind {
+        if let ExprKind::Ret(_) | ExprKind::Match(.., hir::MatchSource::TryDesugar(_)) = ex.kind {
             self.found_return = true;
         } else {
             hir_visit::walk_expr(self, ex);
@@ -68,7 +68,7 @@ impl<'tcx> Visitor<'tcx> for ReturnVisitor {
 /// Returns true for `async || whatever_expression`, but false for `|| async { whatever_expression
 /// }`.
 fn is_async_closure(body: &hir::Body<'_>) -> bool {
-    if let hir::ExprKind::Closure(innermost_closure_generated_by_desugar) = body.value.kind
+    if let ExprKind::Closure(innermost_closure_generated_by_desugar) = body.value.kind
         // checks whether it is `async || whatever_expression`
         && let ClosureKind::Coroutine(CoroutineKind::Desugared(CoroutineDesugaring::Async, CoroutineSource::Closure))
             = innermost_closure_generated_by_desugar.kind
@@ -99,7 +99,7 @@ fn find_innermost_closure<'tcx>(
 )> {
     let mut data = None;
 
-    while let hir::ExprKind::Closure(closure) = expr.kind
+    while let ExprKind::Closure(closure) = expr.kind
         && let body = cx.tcx.hir().body(closure.body)
         && {
             let mut visitor = ReturnVisitor::new();
@@ -137,7 +137,7 @@ fn get_parent_call_exprs<'tcx>(
 ) -> (&'tcx hir::Expr<'tcx>, usize) {
     let mut depth = 1;
     while let Some(parent) = get_parent_expr(cx, expr)
-        && let hir::ExprKind::Call(recv, _) = parent.kind
+        && let ExprKind::Call(recv, _) = parent.kind
         && expr.span == recv.span
     {
         expr = parent;
@@ -152,13 +152,13 @@ impl<'tcx> LateLintPass<'tcx> for RedundantClosureCall {
             return;
         }
 
-        if let hir::ExprKind::Call(recv, _) = expr.kind
+        if let ExprKind::Call(recv, _) = expr.kind
             // don't lint if the receiver is a call, too.
             // we do this in order to prevent linting multiple times; consider:
             // `(|| || 1)()()`
             //           ^^  we only want to lint for this call (but we walk up the calls to consider both calls).
             // without this check, we'd end up linting twice.
-            && !matches!(recv.kind, hir::ExprKind::Call(..))
+            && !matches!(recv.kind, ExprKind::Call(..))
             // Check if `recv` comes from a macro expansion. If it does, make sure that it's an expansion that is
             // the same as the one the call is in.
             // For instance, let's assume `x!()` returns a closure:
@@ -185,7 +185,7 @@ impl<'tcx> LateLintPass<'tcx> for RedundantClosureCall {
                             Sugg::hir_with_context(cx, body, full_expr.span.ctxt(), "..", &mut applicability);
 
                         if coroutine_kind.is_async()
-                            && let hir::ExprKind::Closure(closure) = body.kind
+                            && let ExprKind::Closure(closure) = body.kind
                         {
                             // Like `async fn`, async closures are wrapped in an additional block
                             // to move all of the closure's arguments into the future.
@@ -202,7 +202,7 @@ impl<'tcx> LateLintPass<'tcx> for RedundantClosureCall {
                             };
 
                             // `async x` is a syntax error, so it becomes `async { x }`
-                            if !matches!(body_expr.kind, hir::ExprKind::Block(_, _)) {
+                            if !matches!(body_expr.kind, ExprKind::Block(_, _)) {
                                 hint = hint.blockify();
                             }
 
@@ -210,7 +210,7 @@ impl<'tcx> LateLintPass<'tcx> for RedundantClosureCall {
                         }
 
                         let is_in_fn_call_arg = if let Node::Expr(expr) = cx.tcx.parent_hir_node(expr.hir_id) {
-                            matches!(expr.kind, hir::ExprKind::Call(_, _))
+                            matches!(expr.kind, ExprKind::Call(_, _))
                         } else {
                             false
                         };
@@ -238,12 +238,12 @@ impl<'tcx> LateLintPass<'tcx> for RedundantClosureCall {
                 path: &'tcx hir::Path<'tcx>,
                 count: usize,
             }
-            impl<'a, 'tcx> hir_visit::Visitor<'tcx> for ClosureUsageCount<'a, 'tcx> {
+            impl<'a, 'tcx> Visitor<'tcx> for ClosureUsageCount<'a, 'tcx> {
                 type NestedFilter = nested_filter::OnlyBodies;
 
                 fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
-                    if let hir::ExprKind::Call(closure, _) = expr.kind
+                    if let ExprKind::Call(closure, _) = expr.kind
-                        && let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = closure.kind
+                        && let ExprKind::Path(hir::QPath::Resolved(_, path)) = closure.kind
                         && self.path.segments[0].ident == path.segments[0].ident
                         && self.path.res == path.res
                     {
@@ -263,13 +263,13 @@ impl<'tcx> LateLintPass<'tcx> for RedundantClosureCall {
 
         for w in block.stmts.windows(2) {
             if let hir::StmtKind::Let(local) = w[0].kind
-                && let Option::Some(t) = local.init
+                && let Some(t) = local.init
-                && let hir::ExprKind::Closure { .. } = t.kind
+                && let ExprKind::Closure { .. } = t.kind
                 && let hir::PatKind::Binding(_, _, ident, _) = local.pat.kind
                 && let hir::StmtKind::Semi(second) = w[1].kind
-                && let hir::ExprKind::Assign(_, call, _) = second.kind
+                && let ExprKind::Assign(_, call, _) = second.kind
-                && let hir::ExprKind::Call(closure, _) = call.kind
+                && let ExprKind::Call(closure, _) = call.kind
-                && let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = closure.kind
+                && let ExprKind::Path(hir::QPath::Resolved(_, path)) = closure.kind
                 && ident == path.segments[0].ident
                 && count_closure_usage(cx, block, path) == 1
             {

clippy_lints/src/redundant_type_annotations.rs

@@ -59,7 +59,7 @@ fn is_same_type<'tcx>(cx: &LateContext<'tcx>, ty_resolved_path: hir::def::Res, f
 
 fn func_hir_id_to_func_ty<'tcx>(cx: &LateContext<'tcx>, hir_id: hir::hir_id::HirId) -> Option<Ty<'tcx>> {
     if let Some((defkind, func_defid)) = cx.typeck_results().type_dependent_def(hir_id)
-        && defkind == hir::def::DefKind::AssocFn
+        && defkind == DefKind::AssocFn
         && let Some(init_ty) = cx.tcx.type_of(func_defid).no_bound_vars()
     {
         Some(init_ty)

clippy_lints/src/thread_local_initializer_can_be_made_const.rs

@@ -59,7 +59,7 @@ impl_lint_pass!(ThreadLocalInitializerCanBeMadeConst => [THREAD_LOCAL_INITIALIZE
 #[inline]
 fn is_thread_local_initializer(
     cx: &LateContext<'_>,
-    fn_kind: rustc_hir::intravisit::FnKind<'_>,
+    fn_kind: intravisit::FnKind<'_>,
     span: rustc_span::Span,
 ) -> Option<bool> {
     let macro_def_id = span.source_callee()?.macro_def_id?;
@@ -85,7 +85,7 @@ impl<'tcx> LateLintPass<'tcx> for ThreadLocalInitializerCanBeMadeConst {
     fn check_fn(
         &mut self,
         cx: &LateContext<'tcx>,
-        fn_kind: rustc_hir::intravisit::FnKind<'tcx>,
+        fn_kind: intravisit::FnKind<'tcx>,
         _: &'tcx rustc_hir::FnDecl<'tcx>,
         body: &'tcx rustc_hir::Body<'tcx>,
         span: rustc_span::Span,

clippy_lints/src/undocumented_unsafe_blocks.rs

@@ -200,7 +200,7 @@ impl<'tcx> LateLintPass<'tcx> for UndocumentedUnsafeBlocks {
         let item_has_safety_comment = item_has_safety_comment(cx, item);
         match (&item.kind, item_has_safety_comment) {
             // lint unsafe impl without safety comment
-            (hir::ItemKind::Impl(impl_), HasSafetyComment::No) if impl_.unsafety == hir::Unsafety::Unsafe => {
+            (ItemKind::Impl(impl_), HasSafetyComment::No) if impl_.unsafety == hir::Unsafety::Unsafe => {
                 if !is_lint_allowed(cx, UNDOCUMENTED_UNSAFE_BLOCKS, item.hir_id())
                     && !is_unsafe_from_proc_macro(cx, item.span)
                 {
@@ -222,7 +222,7 @@ impl<'tcx> LateLintPass<'tcx> for UndocumentedUnsafeBlocks {
                 }
             },
             // lint safe impl with unnecessary safety comment
-            (hir::ItemKind::Impl(impl_), HasSafetyComment::Yes(pos)) if impl_.unsafety == hir::Unsafety::Normal => {
+            (ItemKind::Impl(impl_), HasSafetyComment::Yes(pos)) if impl_.unsafety == hir::Unsafety::Normal => {
                 if !is_lint_allowed(cx, UNNECESSARY_SAFETY_COMMENT, item.hir_id()) {
                     let (span, help_span) = mk_spans(pos);
 
@@ -236,9 +236,9 @@ impl<'tcx> LateLintPass<'tcx> for UndocumentedUnsafeBlocks {
                     );
                 }
             },
-            (hir::ItemKind::Impl(_), _) => {},
+            (ItemKind::Impl(_), _) => {},
             // const and static items only need a safety comment if their body is an unsafe block, lint otherwise
-            (&hir::ItemKind::Const(.., body) | &hir::ItemKind::Static(.., body), HasSafetyComment::Yes(pos)) => {
+            (&ItemKind::Const(.., body) | &ItemKind::Static(.., body), HasSafetyComment::Yes(pos)) => {
                 if !is_lint_allowed(cx, UNNECESSARY_SAFETY_COMMENT, body.hir_id) {
                     let body = cx.tcx.hir().body(body);
                     if !matches!(
@@ -338,13 +338,13 @@ fn block_parents_have_safety_comment(
     accept_comment_above_statement: bool,
     accept_comment_above_attributes: bool,
     cx: &LateContext<'_>,
-    id: hir::HirId,
+    id: HirId,
 ) -> bool {
     let (span, hir_id) = match cx.tcx.parent_hir_node(id) {
         Node::Expr(expr) => match cx.tcx.parent_hir_node(expr.hir_id) {
             Node::Local(hir::Local { span, hir_id, .. }) => (*span, *hir_id),
             Node::Item(hir::Item {
-                kind: hir::ItemKind::Const(..) | ItemKind::Static(..),
+                kind: ItemKind::Const(..) | ItemKind::Static(..),
                 span,
                 owner_id,
                 ..
@@ -365,7 +365,7 @@ fn block_parents_have_safety_comment(
         })
         | Node::Local(hir::Local { span, hir_id, .. }) => (*span, *hir_id),
         Node::Item(hir::Item {
-            kind: hir::ItemKind::Const(..) | ItemKind::Static(..),
+            kind: ItemKind::Const(..) | ItemKind::Static(..),
             span,
             owner_id,
             ..
@@ -605,11 +605,11 @@ fn get_body_search_span(cx: &LateContext<'_>) -> Option<Span> {
             Node::Expr(e) => span = e.span,
             Node::Block(_) | Node::Arm(_) | Node::Stmt(_) | Node::Local(_) => (),
             Node::Item(hir::Item {
-                kind: hir::ItemKind::Const(..) | ItemKind::Static(..),
+                kind: ItemKind::Const(..) | ItemKind::Static(..),
                 ..
             }) => maybe_global_var = true,
             Node::Item(hir::Item {
-                kind: hir::ItemKind::Mod(_),
+                kind: ItemKind::Mod(_),
                 span: item_span,
                 ..
             }) => {

clippy_lints/src/unit_types/unit_arg.rs

@@ -2,7 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::is_from_proc_macro;
 use clippy_utils::source::{indent_of, reindent_multiline, snippet_opt};
 use rustc_errors::Applicability;
-use rustc_hir::{self as hir, Block, Expr, ExprKind, MatchSource, Node, StmtKind};
+use rustc_hir::{Block, Expr, ExprKind, MatchSource, Node, StmtKind};
 use rustc_lint::LateContext;
 
 use super::{utils, UNIT_ARG};
@@ -19,7 +19,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
     if is_questionmark_desugar_marked_call(expr) {
         return;
     }
-    if let hir::Node::Expr(parent_expr) = cx.tcx.parent_hir_node(expr.hir_id)
+    if let Node::Expr(parent_expr) = cx.tcx.parent_hir_node(expr.hir_id)
         && is_questionmark_desugar_marked_call(parent_expr)
     {
         return;

clippy_lints/src/unnecessary_map_on_constructor.rs

@@ -65,7 +65,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryMapOnConstructor {
                 hir::QPath::LangItem(..) => return,
             };
             match constructor_symbol {
-                sym::Some | sym::Ok if path.ident.name == rustc_span::sym::map => (),
+                sym::Some | sym::Ok if path.ident.name == sym::map => (),
                 sym::Err if path.ident.name == sym::map_err => (),
                 _ => return,
             }

clippy_lints/src/unnested_or_patterns.rs

@@ -215,7 +215,7 @@ macro_rules! always_pat {
 /// in `alternatives[focus_idx + 1..]`.
 fn transform_with_focus_on_idx(alternatives: &mut ThinVec<P<Pat>>, focus_idx: usize) -> bool {
     // Extract the kind; we'll need to make some changes in it.
-    let mut focus_kind = mem::replace(&mut alternatives[focus_idx].kind, PatKind::Wild);
+    let mut focus_kind = mem::replace(&mut alternatives[focus_idx].kind, Wild);
     // We'll focus on `alternatives[focus_idx]`,
     // so we're draining from `alternatives[focus_idx + 1..]`.
     let start = focus_idx + 1;

clippy_lints/src/unused_io_amount.rs

@@ -85,7 +85,7 @@ impl<'tcx> LateLintPass<'tcx> for UnusedIoAmount {
         if let Some(exp) = block.expr
             && matches!(
                 exp.kind,
-                hir::ExprKind::If(_, _, _) | hir::ExprKind::Match(_, _, hir::MatchSource::Normal)
+                ExprKind::If(_, _, _) | ExprKind::Match(_, _, hir::MatchSource::Normal)
             )
         {
             check_expr(cx, exp);
@@ -130,7 +130,7 @@ fn non_consuming_ok_arm<'a>(cx: &LateContext<'a>, arm: &hir::Arm<'a>) -> bool {
 
 fn check_expr<'a>(cx: &LateContext<'a>, expr: &'a hir::Expr<'a>) {
     match expr.kind {
-        hir::ExprKind::If(cond, _, _)
+        ExprKind::If(cond, _, _)
             if let ExprKind::Let(hir::Let { pat, init, .. }) = cond.kind
                 && is_ok_wild_or_dotdot_pattern(cx, pat)
                 && let Some(op) = should_lint(cx, init) =>
@@ -140,7 +140,7 @@ fn check_expr<'a>(cx: &LateContext<'a>, expr: &'a hir::Expr<'a>) {
         // we will capture only the case where the match is Ok( ) or Err( )
         // prefer to match the minimum possible, and expand later if needed
         // to avoid false positives on something as used as this
-        hir::ExprKind::Match(expr, [arm1, arm2], hir::MatchSource::Normal) if let Some(op) = should_lint(cx, expr) => {
+        ExprKind::Match(expr, [arm1, arm2], hir::MatchSource::Normal) if let Some(op) = should_lint(cx, expr) => {
             if non_consuming_ok_arm(cx, arm1) && non_consuming_err_arm(cx, arm2) {
                 emit_lint(cx, expr.span, expr.hir_id, op, &[arm1.pat.span]);
             }
@@ -148,7 +148,7 @@ fn check_expr<'a>(cx: &LateContext<'a>, expr: &'a hir::Expr<'a>) {
                 emit_lint(cx, expr.span, expr.hir_id, op, &[arm2.pat.span]);
             }
         },
-        hir::ExprKind::Match(_, _, hir::MatchSource::Normal) => {},
+        ExprKind::Match(_, _, hir::MatchSource::Normal) => {},
         _ if let Some(op) = should_lint(cx, expr) => {
             emit_lint(cx, expr.span, expr.hir_id, op, &[]);
         },
@@ -201,7 +201,7 @@ fn is_unreachable_or_panic(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
 }
 
 fn unpack_call_chain<'a>(mut expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
-    while let hir::ExprKind::MethodCall(path, receiver, ..) = expr.kind {
+    while let ExprKind::MethodCall(path, receiver, ..) = expr.kind {
         if matches!(
             path.ident.as_str(),
             "unwrap" | "expect" | "unwrap_or" | "unwrap_or_else" | "ok" | "is_ok" | "is_err" | "or_else" | "or"
@@ -215,10 +215,10 @@ fn unpack_call_chain<'a>(mut expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
 }
 
 fn unpack_try<'a>(mut expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
-    while let hir::ExprKind::Call(func, [ref arg_0, ..]) = expr.kind
+    while let ExprKind::Call(func, [ref arg_0, ..]) = expr.kind
         && matches!(
             func.kind,
-            hir::ExprKind::Path(hir::QPath::LangItem(hir::LangItem::TryTraitBranch, ..))
+            ExprKind::Path(hir::QPath::LangItem(hir::LangItem::TryTraitBranch, ..))
         )
     {
         expr = arg_0;
@@ -227,7 +227,7 @@ fn unpack_try<'a>(mut expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
 }
 
 fn unpack_match<'a>(mut expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
-    while let hir::ExprKind::Match(res, _, _) = expr.kind {
+    while let ExprKind::Match(res, _, _) = expr.kind {
         expr = res;
     }
     expr
@@ -236,11 +236,11 @@ fn unpack_match<'a>(mut expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
 /// If `expr` is an (e).await, return the inner expression "e" that's being
 /// waited on.  Otherwise return None.
 fn unpack_await<'a>(expr: &'a hir::Expr<'a>) -> &hir::Expr<'a> {
-    if let hir::ExprKind::Match(expr, _, hir::MatchSource::AwaitDesugar) = expr.kind {
+    if let ExprKind::Match(expr, _, hir::MatchSource::AwaitDesugar) = expr.kind {
-        if let hir::ExprKind::Call(func, [ref arg_0, ..]) = expr.kind {
+        if let ExprKind::Call(func, [ref arg_0, ..]) = expr.kind {
             if matches!(
                 func.kind,
-                hir::ExprKind::Path(hir::QPath::LangItem(hir::LangItem::IntoFutureIntoFuture, ..))
+                ExprKind::Path(hir::QPath::LangItem(hir::LangItem::IntoFutureIntoFuture, ..))
             ) {
                 return arg_0;
             }
@@ -251,7 +251,7 @@ fn unpack_await<'a>(expr: &'a hir::Expr<'a>) -> &hir::Expr<'a> {
 
 /// Check whether the current expr is a function call for an IO operation
 fn check_io_mode(cx: &LateContext<'_>, call: &hir::Expr<'_>) -> Option<IoOp> {
-    let hir::ExprKind::MethodCall(path, ..) = call.kind else {
+    let ExprKind::MethodCall(path, ..) = call.kind else {
         return None;
     };
 

clippy_lints/src/unwrap_in_result.rs

@@ -59,7 +59,7 @@ declare_lint_pass!(UnwrapInResult=> [UNWRAP_IN_RESULT]);
 
 impl<'tcx> LateLintPass<'tcx> for UnwrapInResult {
     fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
-        if let hir::ImplItemKind::Fn(ref _signature, _) = impl_item.kind
+        if let ImplItemKind::Fn(ref _signature, _) = impl_item.kind
             // first check if it's a method or function
             // checking if its return type is `result` or `option`
             && (is_type_diagnostic_item(cx, return_ty(cx, impl_item.owner_id), sym::Result)

clippy_lints/src/use_self.rs

@@ -207,7 +207,7 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
         }
     }
 
-    fn check_ty(&mut self, cx: &LateContext<'tcx>, hir_ty: &hir::Ty<'tcx>) {
+    fn check_ty(&mut self, cx: &LateContext<'tcx>, hir_ty: &Ty<'tcx>) {
         if !hir_ty.span.from_expansion()
             && self.msrv.meets(msrvs::TYPE_ALIAS_ENUM_VARIANTS)
             && let Some(&StackItem::Check {
@@ -286,7 +286,7 @@ impl<'tcx> Visitor<'tcx> for SkipTyCollector {
 
         walk_inf(self, inf);
     }
-    fn visit_ty(&mut self, hir_ty: &hir::Ty<'_>) {
+    fn visit_ty(&mut self, hir_ty: &Ty<'_>) {
         self.types_to_skip.push(hir_ty.hir_id);
 
         walk_ty(self, hir_ty);

clippy_lints/src/utils/author.rs

@@ -747,7 +747,7 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
     }
 }
 
-fn has_attr(cx: &LateContext<'_>, hir_id: hir::HirId) -> bool {
+fn has_attr(cx: &LateContext<'_>, hir_id: HirId) -> bool {
     let attrs = cx.tcx.hir().attrs(hir_id);
     get_attr(cx.sess(), attrs, "author").count() > 0
 }
@@ -764,7 +764,7 @@ fn path_to_string(path: &QPath<'_>) -> Result<String, ()> {
                 }
             },
             QPath::TypeRelative(ty, segment) => match &ty.kind {
-                hir::TyKind::Path(inner_path) => {
+                TyKind::Path(inner_path) => {
                     inner(s, inner_path)?;
                     *s += ", ";
                     write!(s, "{:?}", segment.ident.as_str()).unwrap();

clippy_lints/src/utils/internal_lints/collapsible_calls.rs

@@ -2,7 +2,6 @@ use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet;
 use clippy_utils::{is_expr_path_def_path, is_lint_allowed, peel_blocks_with_stmt, SpanlessEq};
 use rustc_errors::Applicability;
-use rustc_hir as hir;
 use rustc_hir::{Closure, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
@@ -72,7 +71,7 @@ declare_clippy_lint! {
 declare_lint_pass!(CollapsibleCalls => [COLLAPSIBLE_SPAN_LINT_CALLS]);
 
 impl<'tcx> LateLintPass<'tcx> for CollapsibleCalls {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if is_lint_allowed(cx, COLLAPSIBLE_SPAN_LINT_CALLS, expr.hir_id) {
             return;
         }

clippy_lints/src/utils/internal_lints/metadata_collector.rs

@@ -153,7 +153,7 @@ impl MetadataCollector {
             lints: BinaryHeap::<LintMetadata>::default(),
             applicability_info: FxHashMap::<String, ApplicabilityInfo>::default(),
             config: get_configuration_metadata(),
-            clippy_project_root: std::env::current_dir()
+            clippy_project_root: env::current_dir()
                 .expect("failed to get current dir")
                 .ancestors()
                 .nth(1)
@@ -243,7 +243,7 @@ Please use that command to update the file and do not edit it by hand.
         .unwrap();
 
         // Write configuration links to CHANGELOG.md
-        let changelog = std::fs::read_to_string(CHANGELOG_PATH).unwrap();
+        let changelog = fs::read_to_string(CHANGELOG_PATH).unwrap();
         let mut changelog_file = File::create(CHANGELOG_PATH).unwrap();
         let position = changelog
             .find("<!-- begin autogenerated links to configuration documentation -->")
@@ -912,7 +912,7 @@ impl<'a, 'hir> LintResolver<'a, 'hir> {
     }
 }
 
-impl<'a, 'hir> intravisit::Visitor<'hir> for LintResolver<'a, 'hir> {
+impl<'a, 'hir> Visitor<'hir> for LintResolver<'a, 'hir> {
     type NestedFilter = nested_filter::All;
 
     fn nested_visit_map(&mut self) -> Self::Map {
@@ -963,7 +963,7 @@ impl<'a, 'hir> ApplicabilityResolver<'a, 'hir> {
     }
 }
 
-impl<'a, 'hir> intravisit::Visitor<'hir> for ApplicabilityResolver<'a, 'hir> {
+impl<'a, 'hir> Visitor<'hir> for ApplicabilityResolver<'a, 'hir> {
     type NestedFilter = nested_filter::All;
 
     fn nested_visit_map(&mut self) -> Self::Map {
@@ -1042,7 +1042,7 @@ impl<'a, 'hir> IsMultiSpanScanner<'a, 'hir> {
     }
 }
 
-impl<'a, 'hir> intravisit::Visitor<'hir> for IsMultiSpanScanner<'a, 'hir> {
+impl<'a, 'hir> Visitor<'hir> for IsMultiSpanScanner<'a, 'hir> {
     type NestedFilter = nested_filter::All;
 
     fn nested_visit_map(&mut self) -> Self::Map {

clippy_lints/src/utils/internal_lints/unnecessary_def_path.rs

@@ -4,7 +4,6 @@ use clippy_utils::{def_path_def_ids, is_lint_allowed, match_any_def_paths, peel_
 use rustc_ast::ast::LitKind;
 use rustc_data_structures::fx::{FxHashSet, FxIndexSet};
 use rustc_errors::Applicability;
-use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::{Expr, ExprKind, Local, Mutability, Node};
@@ -49,7 +48,7 @@ pub struct UnnecessaryDefPath {
 }
 
 impl<'tcx> LateLintPass<'tcx> for UnnecessaryDefPath {
-    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+    fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
         if is_lint_allowed(cx, UNNECESSARY_DEF_PATH, expr.hir_id) {
             return;
         }
@@ -213,7 +212,7 @@ impl UnnecessaryDefPath {
     }
 }
 
-fn path_to_matched_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Vec<String>> {
+fn path_to_matched_type(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<Vec<String>> {
     match peel_hir_expr_refs(expr).0.kind {
         ExprKind::Path(ref qpath) => match cx.qpath_res(qpath, expr.hir_id) {
             Res::Local(hir_id) => {

clippy_utils/src/ast_utils.rs

@@ -97,8 +97,8 @@ pub fn eq_path_seg(l: &PathSegment, r: &PathSegment) -> bool {
 
 pub fn eq_generic_args(l: &GenericArgs, r: &GenericArgs) -> bool {
     match (l, r) {
-        (GenericArgs::AngleBracketed(l), GenericArgs::AngleBracketed(r)) => over(&l.args, &r.args, eq_angle_arg),
+        (AngleBracketed(l), AngleBracketed(r)) => over(&l.args, &r.args, eq_angle_arg),
-        (GenericArgs::Parenthesized(l), GenericArgs::Parenthesized(r)) => {
+        (Parenthesized(l), Parenthesized(r)) => {
             over(&l.inputs, &r.inputs, |l, r| eq_ty(l, r)) && eq_fn_ret_ty(&l.output, &r.output)
         },
         _ => false,
@@ -304,25 +304,25 @@ pub fn eq_item_kind(l: &ItemKind, r: &ItemKind) -> bool {
         (ExternCrate(l), ExternCrate(r)) => l == r,
         (Use(l), Use(r)) => eq_use_tree(l, r),
         (
-            Static(box ast::StaticItem {
+            Static(box StaticItem {
                 ty: lt,
                 mutability: lm,
                 expr: le,
             }),
-            Static(box ast::StaticItem {
+            Static(box StaticItem {
                 ty: rt,
                 mutability: rm,
                 expr: re,
             }),
         ) => lm == rm && eq_ty(lt, rt) && eq_expr_opt(le, re),
         (
-            Const(box ast::ConstItem {
+            Const(box ConstItem {
                 defaultness: ld,
                 generics: lg,
                 ty: lt,
                 expr: le,
             }),
-            Const(box ast::ConstItem {
+            Const(box ConstItem {
                 defaultness: rd,
                 generics: rg,
                 ty: rt,
@@ -493,13 +493,13 @@ pub fn eq_assoc_item_kind(l: &AssocItemKind, r: &AssocItemKind) -> bool {
     use AssocItemKind::*;
     match (l, r) {
         (
-            Const(box ast::ConstItem {
+            Const(box ConstItem {
                 defaultness: ld,
                 generics: lg,
                 ty: lt,
                 expr: le,
             }),
-            Const(box ast::ConstItem {
+            Const(box ConstItem {
                 defaultness: rd,
                 generics: rg,
                 ty: rt,
@@ -523,14 +523,14 @@ pub fn eq_assoc_item_kind(l: &AssocItemKind, r: &AssocItemKind) -> bool {
             eq_defaultness(*ld, *rd) && eq_fn_sig(lf, rf) && eq_generics(lg, rg) && both(lb, rb, |l, r| eq_block(l, r))
         },
         (
-            Type(box ast::TyAlias {
+            Type(box TyAlias {
                 defaultness: ld,
                 generics: lg,
                 bounds: lb,
                 ty: lt,
                 ..
             }),
-            Type(box ast::TyAlias {
+            Type(box TyAlias {
                 defaultness: rd,
                 generics: rg,
                 bounds: rb,

clippy_utils/src/consts.rs

@@ -24,7 +24,7 @@ use std::iter;
 /// A `LitKind`-like enum to fold constant `Expr`s into.
 #[derive(Debug, Clone)]
 pub enum Constant<'tcx> {
-    Adt(rustc_middle::mir::Const<'tcx>),
+    Adt(mir::Const<'tcx>),
     /// A `String` (e.g., "abc").
     Str(String),
     /// A binary string (e.g., `b"abc"`).
@@ -207,7 +207,7 @@ impl<'tcx> Constant<'tcx> {
                     .zip(r)
                     .zip(tys)
                     .map(|((li, ri), cmp_type)| Self::partial_cmp(tcx, cmp_type, li, ri))
-                    .find(|r| r.map_or(true, |o| o != Ordering::Equal))
+                    .find(|r| r.map_or(true, |o| o != Equal))
                     .unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
                 _ => None,
             },
@@ -217,7 +217,7 @@ impl<'tcx> Constant<'tcx> {
                 };
                 iter::zip(l, r)
                     .map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
-                    .find(|r| r.map_or(true, |o| o != Ordering::Equal))
+                    .find(|r| r.map_or(true, |o| o != Equal))
                     .unwrap_or_else(|| Some(l.len().cmp(&r.len())))
             },
             (Self::Repeat(lv, ls), Self::Repeat(rv, rs)) => {
@@ -361,7 +361,7 @@ pub enum FullInt {
 impl PartialEq for FullInt {
     #[must_use]
     fn eq(&self, other: &Self) -> bool {
-        self.cmp(other) == Ordering::Equal
+        self.cmp(other) == Equal
     }
 }
 
@@ -579,7 +579,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
     /// Lookup a possibly constant expression from an `ExprKind::Path` and apply a function on it.
     fn fetch_path_and_apply<T, F>(&mut self, qpath: &QPath<'_>, id: HirId, ty: Ty<'tcx>, f: F) -> Option<T>
     where
-        F: FnOnce(&mut Self, rustc_middle::mir::Const<'tcx>) -> Option<T>,
+        F: FnOnce(&mut Self, mir::Const<'tcx>) -> Option<T>,
     {
         let res = self.typeck_results.qpath_res(qpath, id);
         match res {
@@ -612,7 +612,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
                     .tcx
                     .const_eval_resolve(self.param_env, mir::UnevaluatedConst::new(def_id, args), qpath.span())
                     .ok()
-                    .map(|val| rustc_middle::mir::Const::from_value(val, ty))?;
+                    .map(|val| mir::Const::from_value(val, ty))?;
                 f(self, result)
             },
             _ => None,

clippy_utils/src/higher.rs

@@ -16,11 +16,11 @@ use rustc_span::{sym, symbol, Span};
 /// `for pat in arg { body }` becomes `(pat, arg, body)`. Returns `(pat, arg, body, span)`.
 pub struct ForLoop<'tcx> {
     /// `for` loop item
-    pub pat: &'tcx hir::Pat<'tcx>,
+    pub pat: &'tcx Pat<'tcx>,
     /// `IntoIterator` argument
-    pub arg: &'tcx hir::Expr<'tcx>,
+    pub arg: &'tcx Expr<'tcx>,
     /// `for` loop body
-    pub body: &'tcx hir::Expr<'tcx>,
+    pub body: &'tcx Expr<'tcx>,
     /// Compare this against `hir::Destination.target`
     pub loop_id: HirId,
     /// entire `for` loop span
@@ -30,13 +30,13 @@ pub struct ForLoop<'tcx> {
 impl<'tcx> ForLoop<'tcx> {
     /// Parses a desugared `for` loop
     pub fn hir(expr: &Expr<'tcx>) -> Option<Self> {
-        if let hir::ExprKind::DropTemps(e) = expr.kind
+        if let ExprKind::DropTemps(e) = expr.kind
-            && let hir::ExprKind::Match(iterexpr, [arm], hir::MatchSource::ForLoopDesugar) = e.kind
+            && let ExprKind::Match(iterexpr, [arm], MatchSource::ForLoopDesugar) = e.kind
-            && let hir::ExprKind::Call(_, [arg]) = iterexpr.kind
+            && let ExprKind::Call(_, [arg]) = iterexpr.kind
-            && let hir::ExprKind::Loop(block, ..) = arm.body.kind
+            && let ExprKind::Loop(block, ..) = arm.body.kind
             && let [stmt] = block.stmts
             && let hir::StmtKind::Expr(e) = stmt.kind
-            && let hir::ExprKind::Match(_, [_, some_arm], _) = e.kind
+            && let ExprKind::Match(_, [_, some_arm], _) = e.kind
             && let hir::PatKind::Struct(_, [field], _) = some_arm.pat.kind
         {
             return Some(Self {
@@ -209,28 +209,28 @@ impl<'hir> IfOrIfLet<'hir> {
 #[derive(Debug, Copy, Clone)]
 pub struct Range<'a> {
     /// The lower bound of the range, or `None` for ranges such as `..X`.
-    pub start: Option<&'a hir::Expr<'a>>,
+    pub start: Option<&'a Expr<'a>>,
     /// The upper bound of the range, or `None` for ranges such as `X..`.
-    pub end: Option<&'a hir::Expr<'a>>,
+    pub end: Option<&'a Expr<'a>>,
     /// Whether the interval is open or closed.
     pub limits: ast::RangeLimits,
 }
 
 impl<'a> Range<'a> {
     /// Higher a `hir` range to something similar to `ast::ExprKind::Range`.
-    pub fn hir(expr: &'a hir::Expr<'_>) -> Option<Range<'a>> {
+    pub fn hir(expr: &'a Expr<'_>) -> Option<Range<'a>> {
         /// Finds the field named `name` in the field. Always return `Some` for
         /// convenience.
-        fn get_field<'c>(name: &str, fields: &'c [hir::ExprField<'_>]) -> Option<&'c hir::Expr<'c>> {
+        fn get_field<'c>(name: &str, fields: &'c [hir::ExprField<'_>]) -> Option<&'c Expr<'c>> {
             let expr = &fields.iter().find(|field| field.ident.name.as_str() == name)?.expr;
             Some(expr)
         }
 
         match expr.kind {
-            hir::ExprKind::Call(path, args)
+            ExprKind::Call(path, args)
                 if matches!(
                     path.kind,
-                    hir::ExprKind::Path(hir::QPath::LangItem(hir::LangItem::RangeInclusiveNew, ..))
+                    ExprKind::Path(QPath::LangItem(hir::LangItem::RangeInclusiveNew, ..))
                 ) =>
             {
                 Some(Range {
@@ -239,28 +239,28 @@ impl<'a> Range<'a> {
                     limits: ast::RangeLimits::Closed,
                 })
             },
-            hir::ExprKind::Struct(path, fields, None) => match &path {
+            ExprKind::Struct(path, fields, None) => match &path {
-                hir::QPath::LangItem(hir::LangItem::RangeFull, ..) => Some(Range {
+                QPath::LangItem(hir::LangItem::RangeFull, ..) => Some(Range {
                     start: None,
                     end: None,
                     limits: ast::RangeLimits::HalfOpen,
                 }),
-                hir::QPath::LangItem(hir::LangItem::RangeFrom, ..) => Some(Range {
+                QPath::LangItem(hir::LangItem::RangeFrom, ..) => Some(Range {
                     start: Some(get_field("start", fields)?),
                     end: None,
                     limits: ast::RangeLimits::HalfOpen,
                 }),
-                hir::QPath::LangItem(hir::LangItem::Range, ..) => Some(Range {
+                QPath::LangItem(hir::LangItem::Range, ..) => Some(Range {
                     start: Some(get_field("start", fields)?),
                     end: Some(get_field("end", fields)?),
                     limits: ast::RangeLimits::HalfOpen,
                 }),
-                hir::QPath::LangItem(hir::LangItem::RangeToInclusive, ..) => Some(Range {
+                QPath::LangItem(hir::LangItem::RangeToInclusive, ..) => Some(Range {
                     start: None,
                     end: Some(get_field("end", fields)?),
                     limits: ast::RangeLimits::Closed,
                 }),
-                hir::QPath::LangItem(hir::LangItem::RangeTo, ..) => Some(Range {
+                QPath::LangItem(hir::LangItem::RangeTo, ..) => Some(Range {
                     start: None,
                     end: Some(get_field("end", fields)?),
                     limits: ast::RangeLimits::HalfOpen,
@@ -275,17 +275,17 @@ impl<'a> Range<'a> {
 /// Represents the pre-expansion arguments of a `vec!` invocation.
 pub enum VecArgs<'a> {
     /// `vec![elem; len]`
-    Repeat(&'a hir::Expr<'a>, &'a hir::Expr<'a>),
+    Repeat(&'a Expr<'a>, &'a Expr<'a>),
     /// `vec![a, b, c]`
-    Vec(&'a [hir::Expr<'a>]),
+    Vec(&'a [Expr<'a>]),
 }
 
 impl<'a> VecArgs<'a> {
     /// Returns the arguments of the `vec!` macro if this expression was expanded
     /// from `vec!`.
-    pub fn hir(cx: &LateContext<'_>, expr: &'a hir::Expr<'_>) -> Option<VecArgs<'a>> {
+    pub fn hir(cx: &LateContext<'_>, expr: &'a Expr<'_>) -> Option<VecArgs<'a>> {
-        if let hir::ExprKind::Call(fun, args) = expr.kind
+        if let ExprKind::Call(fun, args) = expr.kind
-            && let hir::ExprKind::Path(ref qpath) = fun.kind
+            && let ExprKind::Path(ref qpath) = fun.kind
             && is_expn_of(fun.span, "vec").is_some()
             && let Some(fun_def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id()
         {
@@ -294,8 +294,8 @@ impl<'a> VecArgs<'a> {
                 Some(VecArgs::Repeat(&args[0], &args[1]))
             } else if match_def_path(cx, fun_def_id, &paths::SLICE_INTO_VEC) && args.len() == 1 {
                 // `vec![a, b, c]` case
-                if let hir::ExprKind::Call(_, [arg]) = &args[0].kind
+                if let ExprKind::Call(_, [arg]) = &args[0].kind
-                    && let hir::ExprKind::Array(args) = arg.kind
+                    && let ExprKind::Array(args) = arg.kind
                 {
                     Some(VecArgs::Vec(args))
                 } else {

clippy_utils/src/lib.rs

@@ -16,12 +16,14 @@
     rustc::diagnostic_outside_of_impl,
     rustc::untranslatable_diagnostic
 )]
-// warn on the same lints as `clippy_lints`
+#![warn(
-#![warn(trivial_casts, trivial_numeric_casts)]
+    trivial_casts,
-// warn on lints, that are included in `rust-lang/rust`s bootstrap
+    trivial_numeric_casts,
-#![warn(rust_2018_idioms, unused_lifetimes)]
+    rust_2018_idioms,
-// warn on rustc internal lints
+    unused_lifetimes,
-#![warn(rustc::internal)]
+    unused_qualifications,
+    rustc::internal
+)]
 
 // FIXME: switch to something more ergonomic here, once available.
 // (Currently there is no way to opt into sysroot crates without `extern crate`.)
@@ -349,7 +351,7 @@ pub fn is_def_id_trait_method(cx: &LateContext<'_>, def_id: LocalDefId) -> bool
 /// refers to an item of the trait `Default`, which is associated with the
 /// `diag_item` of `sym::Default`.
 pub fn is_trait_item(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
-    if let hir::ExprKind::Path(ref qpath) = expr.kind {
+    if let ExprKind::Path(ref qpath) = expr.kind {
         cx.qpath_res(qpath, expr.hir_id)
             .opt_def_id()
             .map_or(false, |def_id| is_diag_trait_item(cx, def_id, diag_item))
@@ -723,8 +725,8 @@ pub fn trait_ref_of_method<'tcx>(cx: &LateContext<'tcx>, def_id: LocalDefId) ->
     let hir_id = cx.tcx.local_def_id_to_hir_id(def_id);
     let parent_impl = cx.tcx.hir().get_parent_item(hir_id);
     if parent_impl != hir::CRATE_OWNER_ID
-        && let hir::Node::Item(item) = cx.tcx.hir_node_by_def_id(parent_impl.def_id)
+        && let Node::Item(item) = cx.tcx.hir_node_by_def_id(parent_impl.def_id)
-        && let hir::ItemKind::Impl(impl_) = &item.kind
+        && let ItemKind::Impl(impl_) = &item.kind
     {
         return impl_.of_trait.as_ref();
     }
@@ -830,7 +832,7 @@ fn is_default_equivalent_ctor(cx: &LateContext<'_>, def_id: DefId, path: &QPath<
 
 /// Returns true if the expr is equal to `Default::default` when evaluated.
 pub fn is_default_equivalent_call(cx: &LateContext<'_>, repl_func: &Expr<'_>) -> bool {
-    if let hir::ExprKind::Path(ref repl_func_qpath) = repl_func.kind
+    if let ExprKind::Path(ref repl_func_qpath) = repl_func.kind
         && let Some(repl_def_id) = cx.qpath_res(repl_func_qpath, repl_func.hir_id).opt_def_id()
         && (is_diag_trait_item(cx, repl_def_id, sym::Default)
             || is_default_equivalent_ctor(cx, repl_def_id, repl_func_qpath))
@@ -1295,7 +1297,7 @@ pub fn contains_name<'tcx>(name: Symbol, expr: &'tcx Expr<'_>, cx: &LateContext<
 /// Returns `true` if `expr` contains a return expression
 pub fn contains_return<'tcx>(expr: impl Visitable<'tcx>) -> bool {
     for_each_expr(expr, |e| {
-        if matches!(e.kind, hir::ExprKind::Ret(..)) {
+        if matches!(e.kind, ExprKind::Ret(..)) {
             ControlFlow::Break(())
         } else {
             ControlFlow::Continue(())
@@ -1311,7 +1313,7 @@ pub fn get_parent_expr<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> Option<&'t
 
 /// This retrieves the parent for the given `HirId` if it's an expression. This is useful for
 /// constraint lints
-pub fn get_parent_expr_for_hir<'tcx>(cx: &LateContext<'tcx>, hir_id: hir::HirId) -> Option<&'tcx Expr<'tcx>> {
+pub fn get_parent_expr_for_hir<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Expr<'tcx>> {
     match cx.tcx.parent_hir_node(hir_id) {
         Node::Expr(parent) => Some(parent),
         _ => None,
@@ -1635,13 +1637,13 @@ pub fn is_direct_expn_of(span: Span, name: &str) -> Option<Span> {
 }
 
 /// Convenience function to get the return type of a function.
-pub fn return_ty<'tcx>(cx: &LateContext<'tcx>, fn_def_id: hir::OwnerId) -> Ty<'tcx> {
+pub fn return_ty<'tcx>(cx: &LateContext<'tcx>, fn_def_id: OwnerId) -> Ty<'tcx> {
     let ret_ty = cx.tcx.fn_sig(fn_def_id).instantiate_identity().output();
     cx.tcx.instantiate_bound_regions_with_erased(ret_ty)
 }
 
 /// Convenience function to get the nth argument type of a function.
-pub fn nth_arg<'tcx>(cx: &LateContext<'tcx>, fn_def_id: hir::OwnerId, nth: usize) -> Ty<'tcx> {
+pub fn nth_arg<'tcx>(cx: &LateContext<'tcx>, fn_def_id: OwnerId, nth: usize) -> Ty<'tcx> {
     let arg = cx.tcx.fn_sig(fn_def_id).instantiate_identity().input(nth);
     cx.tcx.instantiate_bound_regions_with_erased(arg)
 }
@@ -1652,8 +1654,8 @@ pub fn is_ctor_or_promotable_const_function(cx: &LateContext<'_>, expr: &Expr<'_
         if let ExprKind::Path(ref qp) = fun.kind {
             let res = cx.qpath_res(qp, fun.hir_id);
             return match res {
-                def::Res::Def(DefKind::Variant | DefKind::Ctor(..), ..) => true,
+                Res::Def(DefKind::Variant | DefKind::Ctor(..), ..) => true,
-                def::Res::Def(_, def_id) => cx.tcx.is_promotable_const_fn(def_id),
+                Res::Def(_, def_id) => cx.tcx.is_promotable_const_fn(def_id),
                 _ => false,
             };
         }
@@ -1667,7 +1669,7 @@ pub fn is_refutable(cx: &LateContext<'_>, pat: &Pat<'_>) -> bool {
     fn is_enum_variant(cx: &LateContext<'_>, qpath: &QPath<'_>, id: HirId) -> bool {
         matches!(
             cx.qpath_res(qpath, id),
-            def::Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(def::CtorOf::Variant, _), _)
+            Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(def::CtorOf::Variant, _), _)
         )
     }
 
@@ -1823,26 +1825,26 @@ pub fn strip_pat_refs<'hir>(mut pat: &'hir Pat<'hir>) -> &'hir Pat<'hir> {
     pat
 }
 
-pub fn int_bits(tcx: TyCtxt<'_>, ity: rustc_ty::IntTy) -> u64 {
+pub fn int_bits(tcx: TyCtxt<'_>, ity: IntTy) -> u64 {
     Integer::from_int_ty(&tcx, ity).size().bits()
 }
 
 #[expect(clippy::cast_possible_wrap)]
 /// Turn a constant int byte representation into an i128
-pub fn sext(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::IntTy) -> i128 {
+pub fn sext(tcx: TyCtxt<'_>, u: u128, ity: IntTy) -> i128 {
     let amt = 128 - int_bits(tcx, ity);
     ((u as i128) << amt) >> amt
 }
 
 #[expect(clippy::cast_sign_loss)]
 /// clip unused bytes
-pub fn unsext(tcx: TyCtxt<'_>, u: i128, ity: rustc_ty::IntTy) -> u128 {
+pub fn unsext(tcx: TyCtxt<'_>, u: i128, ity: IntTy) -> u128 {
     let amt = 128 - int_bits(tcx, ity);
     ((u as u128) << amt) >> amt
 }
 
 /// clip unused bytes
-pub fn clip(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::UintTy) -> u128 {
+pub fn clip(tcx: TyCtxt<'_>, u: u128, ity: UintTy) -> u128 {
     let bits = Integer::from_uint_ty(&tcx, ity).size().bits();
     let amt = 128 - bits;
     (u << amt) >> amt
@@ -2007,7 +2009,7 @@ pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     let did = match expr.kind {
         ExprKind::Call(path, _) => {
             if let ExprKind::Path(ref qpath) = path.kind
-                && let def::Res::Def(_, did) = cx.qpath_res(qpath, path.hir_id)
+                && let Res::Def(_, did) = cx.qpath_res(qpath, path.hir_id)
             {
                 Some(did)
             } else {
@@ -2218,7 +2220,7 @@ pub fn is_no_core_crate(cx: &LateContext<'_>) -> bool {
 /// ```
 pub fn is_trait_impl_item(cx: &LateContext<'_>, hir_id: HirId) -> bool {
     if let Node::Item(item) = cx.tcx.parent_hir_node(hir_id) {
-        matches!(item.kind, ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }))
+        matches!(item.kind, ItemKind::Impl(Impl { of_trait: Some(_), .. }))
     } else {
         false
     }
@@ -2254,7 +2256,7 @@ pub fn fn_def_id(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<DefId> {
 pub fn fn_def_id_with_node_args<'tcx>(
     cx: &LateContext<'tcx>,
     expr: &Expr<'_>,
-) -> Option<(DefId, rustc_ty::GenericArgsRef<'tcx>)> {
+) -> Option<(DefId, GenericArgsRef<'tcx>)> {
     let typeck = cx.typeck_results();
     match &expr.kind {
         ExprKind::MethodCall(..) => Some((
@@ -2500,7 +2502,7 @@ fn with_test_item_names(tcx: TyCtxt<'_>, module: LocalModDefId, f: impl Fn(&[Sym
 /// Checks if the function containing the given `HirId` is a `#[test]` function
 ///
 /// Note: Add `//@compile-flags: --test` to UI tests with a `#[test]` function
-pub fn is_in_test_function(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+pub fn is_in_test_function(tcx: TyCtxt<'_>, id: HirId) -> bool {
     with_test_item_names(tcx, tcx.parent_module(id), |names| {
         tcx.hir()
             .parent_iter(id)
@@ -2523,7 +2525,7 @@ pub fn is_in_test_function(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
 ///
 /// This only checks directly applied attributes, to see if a node is inside a `#[cfg(test)]` parent
 /// use [`is_in_cfg_test`]
-pub fn is_cfg_test(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+pub fn is_cfg_test(tcx: TyCtxt<'_>, id: HirId) -> bool {
     tcx.hir().attrs(id).iter().any(|attr| {
         if attr.has_name(sym::cfg)
             && let Some(items) = attr.meta_item_list()
@@ -2538,7 +2540,7 @@ pub fn is_cfg_test(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
 }
 
 /// Checks if any parent node of `HirId` has `#[cfg(test)]` attribute applied
-pub fn is_in_cfg_test(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+pub fn is_in_cfg_test(tcx: TyCtxt<'_>, id: HirId) -> bool {
     tcx.hir()
         .parent_id_iter(id)
         .any(|parent_id| is_cfg_test(tcx, parent_id))

clippy_utils/src/macros.rs

@@ -429,7 +429,7 @@ pub fn find_format_args(cx: &LateContext<'_>, start: &Expr<'_>, expn_id: ExpnId)
 pub fn find_format_arg_expr<'hir, 'ast>(
     start: &'hir Expr<'hir>,
     target: &'ast FormatArgument,
-) -> Result<&'hir rustc_hir::Expr<'hir>, &'ast rustc_ast::Expr> {
+) -> Result<&'hir Expr<'hir>, &'ast rustc_ast::Expr> {
     let SpanData {
         lo,
         hi,

clippy_utils/src/mir/mod.rs

@@ -111,7 +111,7 @@ pub fn block_in_cycle(body: &Body<'_>, block: BasicBlock) -> bool {
 }
 
 /// Convenience wrapper around `visit_local_usage`.
-pub fn used_exactly_once(mir: &Body<'_>, local: rustc_middle::mir::Local) -> Option<bool> {
+pub fn used_exactly_once(mir: &Body<'_>, local: Local) -> Option<bool> {
     visit_local_usage(
         &[local],
         mir,

clippy_utils/src/sugg.rs

@@ -41,7 +41,7 @@ pub const ONE: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("1"));
 pub const EMPTY: Sugg<'static> = Sugg::NonParen(Cow::Borrowed(""));
 
 impl Display for Sugg<'_> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         match *self {
             Sugg::NonParen(ref s) | Sugg::MaybeParen(ref s) => s.fmt(f),
             Sugg::BinOp(op, ref lhs, ref rhs) => binop_to_string(op, lhs, rhs).fmt(f),
@@ -124,48 +124,48 @@ impl<'a> Sugg<'a> {
         }
 
         match expr.kind {
-            hir::ExprKind::AddrOf(..)
+            ExprKind::AddrOf(..)
-            | hir::ExprKind::If(..)
+            | ExprKind::If(..)
-            | hir::ExprKind::Let(..)
+            | ExprKind::Let(..)
-            | hir::ExprKind::Closure { .. }
+            | ExprKind::Closure { .. }
-            | hir::ExprKind::Unary(..)
+            | ExprKind::Unary(..)
-            | hir::ExprKind::Match(..) => Sugg::MaybeParen(get_snippet(expr.span)),
+            | ExprKind::Match(..) => Sugg::MaybeParen(get_snippet(expr.span)),
-            hir::ExprKind::Continue(..)
+            ExprKind::Continue(..)
-            | hir::ExprKind::Yield(..)
+            | ExprKind::Yield(..)
-            | hir::ExprKind::Array(..)
+            | ExprKind::Array(..)
-            | hir::ExprKind::Block(..)
+            | ExprKind::Block(..)
-            | hir::ExprKind::Break(..)
+            | ExprKind::Break(..)
-            | hir::ExprKind::Call(..)
+            | ExprKind::Call(..)
-            | hir::ExprKind::Field(..)
+            | ExprKind::Field(..)
-            | hir::ExprKind::Index(..)
+            | ExprKind::Index(..)
-            | hir::ExprKind::InlineAsm(..)
+            | ExprKind::InlineAsm(..)
-            | hir::ExprKind::OffsetOf(..)
+            | ExprKind::OffsetOf(..)
-            | hir::ExprKind::ConstBlock(..)
+            | ExprKind::ConstBlock(..)
-            | hir::ExprKind::Lit(..)
+            | ExprKind::Lit(..)
-            | hir::ExprKind::Loop(..)
+            | ExprKind::Loop(..)
-            | hir::ExprKind::MethodCall(..)
+            | ExprKind::MethodCall(..)
-            | hir::ExprKind::Path(..)
+            | ExprKind::Path(..)
-            | hir::ExprKind::Repeat(..)
+            | ExprKind::Repeat(..)
-            | hir::ExprKind::Ret(..)
+            | ExprKind::Ret(..)
-            | hir::ExprKind::Become(..)
+            | ExprKind::Become(..)
-            | hir::ExprKind::Struct(..)
+            | ExprKind::Struct(..)
-            | hir::ExprKind::Tup(..)
+            | ExprKind::Tup(..)
-            | hir::ExprKind::Err(_) => Sugg::NonParen(get_snippet(expr.span)),
+            | ExprKind::Err(_) => Sugg::NonParen(get_snippet(expr.span)),
-            hir::ExprKind::DropTemps(inner) => Self::hir_from_snippet(inner, get_snippet),
+            ExprKind::DropTemps(inner) => Self::hir_from_snippet(inner, get_snippet),
-            hir::ExprKind::Assign(lhs, rhs, _) => {
+            ExprKind::Assign(lhs, rhs, _) => {
                 Sugg::BinOp(AssocOp::Assign, get_snippet(lhs.span), get_snippet(rhs.span))
             },
-            hir::ExprKind::AssignOp(op, lhs, rhs) => {
+            ExprKind::AssignOp(op, lhs, rhs) => {
                 Sugg::BinOp(hirbinop2assignop(op), get_snippet(lhs.span), get_snippet(rhs.span))
             },
-            hir::ExprKind::Binary(op, lhs, rhs) => Sugg::BinOp(
+            ExprKind::Binary(op, lhs, rhs) => Sugg::BinOp(
                 AssocOp::from_ast_binop(op.node),
                 get_snippet(lhs.span),
                 get_snippet(rhs.span),
             ),
-            hir::ExprKind::Cast(lhs, ty) |
+            ExprKind::Cast(lhs, ty) |
             //FIXME(chenyukang), remove this after type ascription is removed from AST
-            hir::ExprKind::Type(lhs, ty) => Sugg::BinOp(AssocOp::As, get_snippet(lhs.span), get_snippet(ty.span)),
+            ExprKind::Type(lhs, ty) => Sugg::BinOp(AssocOp::As, get_snippet(lhs.span), get_snippet(ty.span)),
         }
     }
 
@@ -508,7 +508,7 @@ impl<T> ParenHelper<T> {
 }
 
 impl<T: Display> Display for ParenHelper<T> {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         if self.paren {
             write!(f, "({})", self.wrapped)
         } else {
@@ -801,7 +801,7 @@ pub struct DerefClosure {
 ///
 /// note: this only works on single line immutable closures with exactly one input parameter.
 pub fn deref_closure_args(cx: &LateContext<'_>, closure: &hir::Expr<'_>) -> Option<DerefClosure> {
-    if let hir::ExprKind::Closure(&Closure {
+    if let ExprKind::Closure(&Closure {
         fn_decl, def_id, body, ..
     }) = closure.kind
     {

clippy_utils/src/ty.rs

@@ -91,7 +91,7 @@ pub fn contains_ty_adt_constructor_opaque<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'
                     return true;
                 }
 
-                if let ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) = *inner_ty.kind() {
+                if let ty::Alias(ty::Opaque, AliasTy { def_id, .. }) = *inner_ty.kind() {
                     if !seen.insert(def_id) {
                         return false;
                     }
@@ -301,7 +301,7 @@ pub fn implements_trait_with_env_from_iter<'tcx>(
         cause: ObligationCause::dummy(),
         param_env,
         recursion_depth: 0,
-        predicate: ty::Binder::dummy(trait_ref).to_predicate(tcx),
+        predicate: Binder::dummy(trait_ref).to_predicate(tcx),
     };
     infcx
         .evaluate_obligation(&obligation)
@@ -327,7 +327,7 @@ pub fn is_must_use_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
             is_must_use_ty(cx, *ty)
         },
         ty::Tuple(args) => args.iter().any(|ty| is_must_use_ty(cx, ty)),
-        ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) => {
+        ty::Alias(ty::Opaque, AliasTy { def_id, .. }) => {
             for (predicate, _) in cx.tcx.explicit_item_bounds(def_id).skip_binder() {
                 if let ty::ClauseKind::Trait(trait_predicate) = predicate.kind().skip_binder() {
                     if cx.tcx.has_attr(trait_predicate.trait_ref.def_id, sym::must_use) {
@@ -356,13 +356,13 @@ pub fn is_must_use_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
 // not succeed
 /// Checks if `Ty` is normalizable. This function is useful
 /// to avoid crashes on `layout_of`.
-pub fn is_normalizable<'tcx>(cx: &LateContext<'tcx>, param_env: ty::ParamEnv<'tcx>, ty: Ty<'tcx>) -> bool {
+pub fn is_normalizable<'tcx>(cx: &LateContext<'tcx>, param_env: ParamEnv<'tcx>, ty: Ty<'tcx>) -> bool {
     is_normalizable_helper(cx, param_env, ty, &mut FxHashMap::default())
 }
 
 fn is_normalizable_helper<'tcx>(
     cx: &LateContext<'tcx>,
-    param_env: ty::ParamEnv<'tcx>,
+    param_env: ParamEnv<'tcx>,
     ty: Ty<'tcx>,
     cache: &mut FxHashMap<Ty<'tcx>, bool>,
 ) -> bool {
@@ -372,7 +372,7 @@ fn is_normalizable_helper<'tcx>(
     // prevent recursive loops, false-negative is better than endless loop leading to stack overflow
     cache.insert(ty, false);
     let infcx = cx.tcx.infer_ctxt().build();
-    let cause = rustc_middle::traits::ObligationCause::dummy();
+    let cause = ObligationCause::dummy();
     let result = if infcx.at(&cause, param_env).query_normalize(ty).is_ok() {
         match ty.kind() {
             ty::Adt(def, args) => def.variants().iter().all(|variant| {
@@ -446,7 +446,7 @@ pub fn is_type_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symb
 /// Checks if the type is equal to a lang item.
 ///
 /// Returns `false` if the `LangItem` is not defined.
-pub fn is_type_lang_item(cx: &LateContext<'_>, ty: Ty<'_>, lang_item: hir::LangItem) -> bool {
+pub fn is_type_lang_item(cx: &LateContext<'_>, ty: Ty<'_>, lang_item: LangItem) -> bool {
     match ty.kind() {
         ty::Adt(adt, _) => cx.tcx.lang_items().get(lang_item) == Some(adt.did()),
         _ => false,
@@ -726,7 +726,7 @@ pub fn ty_sig<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<ExprFnSig<'t
             Some(ExprFnSig::Closure(decl, subs.as_closure().sig()))
         },
         ty::FnDef(id, subs) => Some(ExprFnSig::Sig(cx.tcx.fn_sig(id).instantiate(cx.tcx, subs), Some(id))),
-        ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) => sig_from_bounds(
+        ty::Alias(ty::Opaque, AliasTy { def_id, args, .. }) => sig_from_bounds(
             cx,
             ty,
             cx.tcx.item_bounds(def_id).iter_instantiated(cx.tcx, args),
@@ -899,7 +899,7 @@ pub fn is_c_void(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
     if let ty::Adt(adt, _) = ty.kind()
         && let &[krate, .., name] = &*cx.get_def_path(adt.did())
         && let sym::libc | sym::core | sym::std = krate
-        && name == rustc_span::sym::c_void
+        && name == sym::c_void
     {
         true
     } else {
@@ -1134,7 +1134,7 @@ pub fn make_projection<'tcx>(
         #[cfg(debug_assertions)]
         assert_generic_args_match(tcx, assoc_item.def_id, args);
 
-        Some(ty::AliasTy::new(tcx, assoc_item.def_id, args))
+        Some(AliasTy::new(tcx, assoc_item.def_id, args))
     }
     helper(
         tcx,
@@ -1251,7 +1251,7 @@ pub fn make_normalized_projection_with_regions<'tcx>(
             );
             return None;
         }
-        let cause = rustc_middle::traits::ObligationCause::dummy();
+        let cause = ObligationCause::dummy();
         match tcx
             .infer_ctxt()
             .build()
@@ -1269,7 +1269,7 @@ pub fn make_normalized_projection_with_regions<'tcx>(
 }
 
 pub fn normalize_with_regions<'tcx>(tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>, ty: Ty<'tcx>) -> Ty<'tcx> {
-    let cause = rustc_middle::traits::ObligationCause::dummy();
+    let cause = ObligationCause::dummy();
     match tcx.infer_ctxt().build().at(&cause, param_env).query_normalize(ty) {
         Ok(ty) => ty.value,
         Err(_) => ty,

clippy_utils/src/usage.rs

@@ -83,15 +83,15 @@ impl<'tcx> Delegate<'tcx> for MutVarsDelegate {
         self.update(cmt);
     }
 
-    fn fake_read(&mut self, _: &rustc_hir_typeck::expr_use_visitor::PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
+    fn fake_read(&mut self, _: &PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
 }
 
 pub struct ParamBindingIdCollector {
-    pub binding_hir_ids: Vec<hir::HirId>,
+    pub binding_hir_ids: Vec<HirId>,
 }
 impl<'tcx> ParamBindingIdCollector {
-    fn collect_binding_hir_ids(body: &'tcx hir::Body<'tcx>) -> Vec<hir::HirId> {
+    fn collect_binding_hir_ids(body: &'tcx hir::Body<'tcx>) -> Vec<HirId> {
-        let mut hir_ids: Vec<hir::HirId> = Vec::new();
+        let mut hir_ids: Vec<HirId> = Vec::new();
         for param in body.params {
             let mut finder = ParamBindingIdCollector {
                 binding_hir_ids: Vec::new(),
@@ -104,7 +104,7 @@ impl<'tcx> ParamBindingIdCollector {
         hir_ids
     }
 }
-impl<'tcx> intravisit::Visitor<'tcx> for ParamBindingIdCollector {
+impl<'tcx> Visitor<'tcx> for ParamBindingIdCollector {
     fn visit_pat(&mut self, pat: &'tcx hir::Pat<'tcx>) {
         if let hir::PatKind::Binding(_, hir_id, ..) = pat.kind {
             self.binding_hir_ids.push(hir_id);
@@ -115,7 +115,7 @@ impl<'tcx> intravisit::Visitor<'tcx> for ParamBindingIdCollector {
 
 pub struct BindingUsageFinder<'a, 'tcx> {
     cx: &'a LateContext<'tcx>,
-    binding_ids: Vec<hir::HirId>,
+    binding_ids: Vec<HirId>,
     usage_found: bool,
 }
 impl<'a, 'tcx> BindingUsageFinder<'a, 'tcx> {
@@ -129,16 +129,16 @@ impl<'a, 'tcx> BindingUsageFinder<'a, 'tcx> {
         finder.usage_found
     }
 }
-impl<'a, 'tcx> intravisit::Visitor<'tcx> for BindingUsageFinder<'a, 'tcx> {
+impl<'a, 'tcx> Visitor<'tcx> for BindingUsageFinder<'a, 'tcx> {
     type NestedFilter = nested_filter::OnlyBodies;
 
-    fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
+    fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
         if !self.usage_found {
             intravisit::walk_expr(self, expr);
         }
     }
 
-    fn visit_path(&mut self, path: &hir::Path<'tcx>, _: hir::HirId) {
+    fn visit_path(&mut self, path: &hir::Path<'tcx>, _: HirId) {
         if let Res::Local(id) = path.res {
             if self.binding_ids.contains(&id) {
                 self.usage_found = true;

clippy_utils/src/visitors.rs

@@ -180,9 +180,9 @@ pub fn for_each_expr_with_closures<'tcx, B, C: Continue>(
 }
 
 /// returns `true` if expr contains match expr desugared from try
-fn contains_try(expr: &hir::Expr<'_>) -> bool {
+fn contains_try(expr: &Expr<'_>) -> bool {
     for_each_expr(expr, |e| {
-        if matches!(e.kind, hir::ExprKind::Match(_, _, hir::MatchSource::TryDesugar(_))) {
+        if matches!(e.kind, ExprKind::Match(_, _, hir::MatchSource::TryDesugar(_))) {
             ControlFlow::Break(())
         } else {
             ControlFlow::Continue(())
@@ -191,9 +191,9 @@ fn contains_try(expr: &hir::Expr<'_>) -> bool {
     .is_some()
 }
 
-pub fn find_all_ret_expressions<'hir, F>(_cx: &LateContext<'_>, expr: &'hir hir::Expr<'hir>, callback: F) -> bool
+pub fn find_all_ret_expressions<'hir, F>(_cx: &LateContext<'_>, expr: &'hir Expr<'hir>, callback: F) -> bool
 where
-    F: FnMut(&'hir hir::Expr<'hir>) -> bool,
+    F: FnMut(&'hir Expr<'hir>) -> bool,
 {
     struct RetFinder<F> {
         in_stmt: bool,
@@ -236,37 +236,37 @@ where
         }
     }
 
-    impl<'hir, F: FnMut(&'hir hir::Expr<'hir>) -> bool> intravisit::Visitor<'hir> for RetFinder<F> {
+    impl<'hir, F: FnMut(&'hir Expr<'hir>) -> bool> Visitor<'hir> for RetFinder<F> {
-        fn visit_stmt(&mut self, stmt: &'hir hir::Stmt<'_>) {
+        fn visit_stmt(&mut self, stmt: &'hir Stmt<'_>) {
             intravisit::walk_stmt(&mut *self.inside_stmt(true), stmt);
         }
 
-        fn visit_expr(&mut self, expr: &'hir hir::Expr<'_>) {
+        fn visit_expr(&mut self, expr: &'hir Expr<'_>) {
             if self.failed {
                 return;
             }
             if self.in_stmt {
                 match expr.kind {
-                    hir::ExprKind::Ret(Some(expr)) => self.inside_stmt(false).visit_expr(expr),
+                    ExprKind::Ret(Some(expr)) => self.inside_stmt(false).visit_expr(expr),
-                    _ => intravisit::walk_expr(self, expr),
+                    _ => walk_expr(self, expr),
                 }
             } else {
                 match expr.kind {
-                    hir::ExprKind::If(cond, then, else_opt) => {
+                    ExprKind::If(cond, then, else_opt) => {
                         self.inside_stmt(true).visit_expr(cond);
                         self.visit_expr(then);
                         if let Some(el) = else_opt {
                             self.visit_expr(el);
                         }
                     },
-                    hir::ExprKind::Match(cond, arms, _) => {
+                    ExprKind::Match(cond, arms, _) => {
                         self.inside_stmt(true).visit_expr(cond);
                         for arm in arms {
                             self.visit_expr(arm.body);
                         }
                     },
-                    hir::ExprKind::Block(..) => intravisit::walk_expr(self, expr),
+                    ExprKind::Block(..) => walk_expr(self, expr),
-                    hir::ExprKind::Ret(Some(expr)) => self.visit_expr(expr),
+                    ExprKind::Ret(Some(expr)) => self.visit_expr(expr),
                     _ => self.failed |= !(self.cb)(expr),
                 }
             }
@@ -316,7 +316,7 @@ pub fn is_const_evaluatable<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) ->
         is_const: bool,
     }
     impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
-        type NestedFilter = rustc_hir::intravisit::nested_filter::None;
+        type NestedFilter = intravisit::nested_filter::None;
 
         fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
             if !self.is_const {

lintcheck/src/main.rs

@@ -5,6 +5,13 @@
 // When a new lint is introduced, we can search the results for new warnings and check for false
 // positives.
 
+#![warn(
+    trivial_casts,
+    trivial_numeric_casts,
+    rust_2018_idioms,
+    unused_lifetimes,
+    unused_qualifications
+)]
 #![allow(clippy::collapsible_else_if)]
 
 mod config;
@@ -189,13 +196,13 @@ impl CrateSource {
                 // don't download/extract if we already have done so
                 if !krate_file_path.is_file() {
                     // create a file path to download and write the crate data into
-                    let mut krate_dest = std::fs::File::create(&krate_file_path).unwrap();
+                    let mut krate_dest = fs::File::create(&krate_file_path).unwrap();
                     let mut krate_req = get(&url).unwrap().into_reader();
                     // copy the crate into the file
-                    std::io::copy(&mut krate_req, &mut krate_dest).unwrap();
+                    io::copy(&mut krate_req, &mut krate_dest).unwrap();
 
                     // unzip the tarball
-                    let ungz_tar = flate2::read::GzDecoder::new(std::fs::File::open(&krate_file_path).unwrap());
+                    let ungz_tar = flate2::read::GzDecoder::new(fs::File::open(&krate_file_path).unwrap());
                     // extract the tar archive
                     let mut archive = tar::Archive::new(ungz_tar);
                     archive.unpack(&extract_dir).expect("Failed to extract!");
@@ -257,7 +264,7 @@ impl CrateSource {
             },
             CrateSource::Path { name, path, options } => {
                 fn is_cache_dir(entry: &DirEntry) -> bool {
-                    std::fs::read(entry.path().join("CACHEDIR.TAG"))
+                    fs::read(entry.path().join("CACHEDIR.TAG"))
                         .map(|x| x.starts_with(b"Signature: 8a477f597d28d172789f06886806bc55"))
                         .unwrap_or(false)
                 }
@@ -268,7 +275,7 @@ impl CrateSource {
                 let dest_crate_root = PathBuf::from(LINTCHECK_SOURCES).join(name);
                 if dest_crate_root.exists() {
                     println!("Deleting existing directory at {dest_crate_root:?}");
-                    std::fs::remove_dir_all(&dest_crate_root).unwrap();
+                    fs::remove_dir_all(&dest_crate_root).unwrap();
                 }
 
                 println!("Copying {path:?} to {dest_crate_root:?}");
@@ -281,9 +288,9 @@ impl CrateSource {
                     let metadata = entry_path.symlink_metadata().unwrap();
 
                     if metadata.is_dir() {
-                        std::fs::create_dir(dest_path).unwrap();
+                        fs::create_dir(dest_path).unwrap();
                     } else if metadata.is_file() {
-                        std::fs::copy(entry_path, dest_path).unwrap();
+                        fs::copy(entry_path, dest_path).unwrap();
                     }
                 }
 
@@ -330,7 +337,7 @@ impl Crate {
             );
         }
 
-        let cargo_clippy_path = std::fs::canonicalize(cargo_clippy_path).unwrap();
+        let cargo_clippy_path = fs::canonicalize(cargo_clippy_path).unwrap();
 
         let shared_target_dir = clippy_project_root().join("target/lintcheck/shared_target_dir");
 
@@ -353,7 +360,7 @@ impl Crate {
             clippy_args.push("--cap-lints=warn");
         } else {
             clippy_args.push("--cap-lints=allow");
-            clippy_args.extend(lint_filter.iter().map(std::string::String::as_str));
+            clippy_args.extend(lint_filter.iter().map(String::as_str));
         }
 
         if let Some(server) = server {
@@ -454,7 +461,7 @@ fn build_clippy() {
 /// Read a `lintcheck_crates.toml` file
 fn read_crates(toml_path: &Path) -> (Vec<CrateSource>, RecursiveOptions) {
     let toml_content: String =
-        std::fs::read_to_string(toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
+        fs::read_to_string(toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
     let crate_list: SourceList =
         toml::from_str(&toml_content).unwrap_or_else(|e| panic!("Failed to parse {}: \n{e}", toml_path.display()));
     // parse the hashmap of the toml file into a list of crates
@@ -549,7 +556,7 @@ fn main() {
     }
 
     // assert that we launch lintcheck from the repo root (via cargo lintcheck)
-    if std::fs::metadata("lintcheck/Cargo.toml").is_err() {
+    if fs::metadata("lintcheck/Cargo.toml").is_err() {
         eprintln!("lintcheck needs to be run from clippy's repo root!\nUse `cargo lintcheck` alternatively.");
         std::process::exit(3);
     }
@@ -570,7 +577,7 @@ fn main() {
         cargo_clippy_path.display()
     );
 
-    let clippy_ver = std::process::Command::new(&cargo_clippy_path)
+    let clippy_ver = Command::new(&cargo_clippy_path)
         .arg("--version")
         .output()
         .map(|o| String::from_utf8_lossy(&o.stdout).into_owned())
@@ -699,7 +706,7 @@ fn main() {
 
 /// read the previous stats from the lintcheck-log file
 fn read_stats_from_file(file_path: &Path) -> HashMap<String, usize> {
-    let file_content: String = match std::fs::read_to_string(file_path).ok() {
+    let file_content: String = match fs::read_to_string(file_path).ok() {
         Some(content) => content,
         None => {
             return HashMap::new();
@@ -779,17 +786,17 @@ fn print_stats(old_stats: HashMap<String, usize>, new_stats: HashMap<&String, us
 ///
 /// This function panics if creating one of the dirs fails.
 fn create_dirs(krate_download_dir: &Path, extract_dir: &Path) {
-    std::fs::create_dir("target/lintcheck/").unwrap_or_else(|err| {
+    fs::create_dir("target/lintcheck/").unwrap_or_else(|err| {
         assert_eq!(
             err.kind(),
             ErrorKind::AlreadyExists,
             "cannot create lintcheck target dir"
         );
     });
-    std::fs::create_dir(krate_download_dir).unwrap_or_else(|err| {
+    fs::create_dir(krate_download_dir).unwrap_or_else(|err| {
         assert_eq!(err.kind(), ErrorKind::AlreadyExists, "cannot create crate download dir");
     });
-    std::fs::create_dir(extract_dir).unwrap_or_else(|err| {
+    fs::create_dir(extract_dir).unwrap_or_else(|err| {
         assert_eq!(
             err.kind(),
             ErrorKind::AlreadyExists,
@@ -816,7 +823,7 @@ fn lintcheck_test() {
         "--crates-toml",
         "lintcheck/test_sources.toml",
     ];
-    let status = std::process::Command::new(env::var("CARGO").unwrap_or("cargo".into()))
+    let status = Command::new(env::var("CARGO").unwrap_or("cargo".into()))
         .args(args)
         .current_dir("..") // repo root
         .status();