Auto merge of #12813 - flip1995:rustup, r=flip1995

Rustup

r? `@ghost`

changelog: None

29 files changed, 77 insertions, 136 deletions

diff --git a/clippy_lints/src/default_union_representation.rs b/clippy_lints/src/default_union_representation.rs
index 3f87ed8df2b..b4290b6437f 100644
--- a/clippy_lints/src/default_union_representation.rs
+++ b/clippy_lints/src/default_union_representation.rs
@@ -2,7 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_hir::{HirId, Item, ItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::layout::LayoutOf;
-use rustc_middle::ty::{self, FieldDef, GenericArg, List};
+use rustc_middle::ty::{self, FieldDef};
 use rustc_session::declare_lint_pass;
 use rustc_span::sym;
 
@@ -85,7 +85,7 @@ fn is_union_with_two_non_zst_fields<'tcx>(cx: &LateContext<'tcx>, item: &Item<'t
     }
 }
 
-fn is_zst<'tcx>(cx: &LateContext<'tcx>, field: &FieldDef, args: &'tcx List<GenericArg<'tcx>>) -> bool {
+fn is_zst<'tcx>(cx: &LateContext<'tcx>, field: &FieldDef, args: ty::GenericArgsRef<'tcx>) -> bool {
     let ty = field.ty(cx.tcx, args);
     if let Ok(layout) = cx.layout_of(ty) {
         layout.is_zst()
diff --git a/clippy_lints/src/dereference.rs b/clippy_lints/src/dereference.rs
index b936b28470b..c6aef9ac2d6 100644
--- a/clippy_lints/src/dereference.rs
+++ b/clippy_lints/src/dereference.rs
@@ -382,7 +382,7 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing<'tcx> {
                                         cx,
                                         impl_ty,
                                         trait_id,
-                                        &args[..cx.tcx.generics_of(trait_id).params.len() - 1],
+                                        &args[..cx.tcx.generics_of(trait_id).own_params.len() - 1],
                                     )
                                 {
                                     false
diff --git a/clippy_lints/src/derive.rs b/clippy_lints/src/derive.rs
index 42cd19fb8ec..9662c8f4fe2 100644
--- a/clippy_lints/src/derive.rs
+++ b/clippy_lints/src/derive.rs
@@ -480,7 +480,7 @@ fn param_env_for_derived_eq(tcx: TyCtxt<'_>, did: DefId, eq_trait_id: DefId) ->
     // Vec<(param_def, needs_eq)>
     let mut params = tcx
         .generics_of(did)
-        .params
+        .own_params
         .iter()
         .map(|p| (p, matches!(p.kind, GenericParamDefKind::Type { .. })))
         .collect::<Vec<_>>();
diff --git a/clippy_lints/src/escape.rs b/clippy_lints/src/escape.rs
index 386d4c3c317..8d6e27700d8 100644
--- a/clippy_lints/src/escape.rs
+++ b/clippy_lints/src/escape.rs
@@ -1,7 +1,6 @@
 use clippy_utils::diagnostics::span_lint_hir;
 use rustc_hir::{intravisit, AssocItemKind, Body, FnDecl, HirId, HirIdSet, Impl, ItemKind, Node, Pat, PatKind};
 use rustc_hir_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
-use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::FakeReadCause;
 use rustc_middle::ty::layout::LayoutOf;
@@ -105,8 +104,9 @@ impl<'tcx> LateLintPass<'tcx> for BoxedLocal {
             too_large_for_stack: self.too_large_for_stack,
         };
 
-        let infcx = cx.tcx.infer_ctxt().build();
-        ExprUseVisitor::new(&mut v, &infcx, fn_def_id, cx.param_env, cx.typeck_results()).consume_body(body);
+        ExprUseVisitor::for_clippy(cx, fn_def_id, &mut v)
+            .consume_body(body)
+            .into_ok();
 
         for node in v.set {
             span_lint_hir(
diff --git a/clippy_lints/src/future_not_send.rs b/clippy_lints/src/future_not_send.rs
index 18f4e51ebd6..192fb611c2d 100644
--- a/clippy_lints/src/future_not_send.rs
+++ b/clippy_lints/src/future_not_send.rs
@@ -4,6 +4,7 @@ use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Body, FnDecl};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::print::PrintTraitRefExt;
 use rustc_middle::ty::{self, AliasTy, ClauseKind, PredicateKind};
 use rustc_session::declare_lint_pass;
 use rustc_span::def_id::LocalDefId;
diff --git a/clippy_lints/src/implied_bounds_in_impls.rs b/clippy_lints/src/implied_bounds_in_impls.rs
index 3bf8d618955..dc935ed3d7f 100644
--- a/clippy_lints/src/implied_bounds_in_impls.rs
+++ b/clippy_lints/src/implied_bounds_in_impls.rs
@@ -148,7 +148,7 @@ fn try_resolve_type<'tcx>(
     match args.get(index - 1) {
         Some(GenericArg::Type(ty)) => Some(lower_ty(tcx, ty)),
         Some(_) => None,
-        None => Some(tcx.type_of(generics.params[index].def_id).skip_binder()),
+        None => Some(tcx.type_of(generics.own_params[index].def_id).skip_binder()),
     }
 }
 
diff --git a/clippy_lints/src/iter_without_into_iter.rs b/clippy_lints/src/iter_without_into_iter.rs
index c749a712330..a75dfaf286f 100644
--- a/clippy_lints/src/iter_without_into_iter.rs
+++ b/clippy_lints/src/iter_without_into_iter.rs
@@ -225,7 +225,7 @@ impl {self_ty_without_ref} {{
             && let ImplItemKind::Fn(sig, _) = item.kind
             && let FnRetTy::Return(ret) = sig.decl.output
             && is_nameable_in_impl_trait(ret)
-            && cx.tcx.generics_of(item_did).params.is_empty()
+            && cx.tcx.generics_of(item_did).own_params.is_empty()
             && sig.decl.implicit_self == expected_implicit_self
             && sig.decl.inputs.len() == 1
             && let Some(imp) = get_parent_as_impl(cx.tcx, item.hir_id())
diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 553952f211f..3328d642bd8 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -8,6 +8,7 @@
 #![feature(never_type)]
 #![feature(rustc_private)]
 #![feature(stmt_expr_attributes)]
+#![feature(unwrap_infallible)]
 #![recursion_limit = "512"]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 #![allow(
diff --git a/clippy_lints/src/loops/mut_range_bound.rs b/clippy_lints/src/loops/mut_range_bound.rs
index 5047092192f..6c6a9a1a2e0 100644
--- a/clippy_lints/src/loops/mut_range_bound.rs
+++ b/clippy_lints/src/loops/mut_range_bound.rs
@@ -4,7 +4,6 @@ use clippy_utils::{get_enclosing_block, higher, path_to_local};
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_hir::{BindingMode, Expr, ExprKind, HirId, Node, PatKind};
 use rustc_hir_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
-use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::LateContext;
 use rustc_middle::mir::FakeReadCause;
 use rustc_middle::ty;
@@ -61,15 +60,9 @@ fn check_for_mutation(
         span_low: None,
         span_high: None,
     };
-    let infcx = cx.tcx.infer_ctxt().build();
-    ExprUseVisitor::new(
-        &mut delegate,
-        &infcx,
-        body.hir_id.owner.def_id,
-        cx.param_env,
-        cx.typeck_results(),
-    )
-    .walk_expr(body);
+    ExprUseVisitor::for_clippy(cx, body.hir_id.owner.def_id, &mut delegate)
+        .walk_expr(body)
+        .into_ok();
 
     delegate.mutation_span()
 }
diff --git a/clippy_lints/src/manual_assert.rs b/clippy_lints/src/manual_assert.rs
index d76b94eba23..83c16d4466d 100644
--- a/clippy_lints/src/manual_assert.rs
+++ b/clippy_lints/src/manual_assert.rs
@@ -1,10 +1,9 @@
-use crate::rustc_lint::LintContext;
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::macros::{is_panic, root_macro_call};
 use clippy_utils::{is_else_clause, is_parent_stmt, peel_blocks_with_stmt, span_extract_comment, sugg};
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, UnOp};
-use rustc_lint::{LateContext, LateLintPass};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_session::declare_lint_pass;
 
 declare_clippy_lint! {
diff --git a/clippy_lints/src/matches/significant_drop_in_scrutinee.rs b/clippy_lints/src/matches/significant_drop_in_scrutinee.rs
index 3171acda442..6ac0705abb2 100644
--- a/clippy_lints/src/matches/significant_drop_in_scrutinee.rs
+++ b/clippy_lints/src/matches/significant_drop_in_scrutinee.rs
@@ -6,7 +6,7 @@ use rustc_errors::{Applicability, Diag};
 use rustc_hir::intravisit::{walk_expr, Visitor};
 use rustc_hir::{Arm, Expr, ExprKind, MatchSource};
 use rustc_lint::{LateContext, LintContext};
-use rustc_middle::ty::{GenericArgKind, Ty, TypeAndMut};
+use rustc_middle::ty::{GenericArgKind, Ty};
 use rustc_span::Span;
 
 use super::SIGNIFICANT_DROP_IN_SCRUTINEE;
@@ -249,9 +249,9 @@ impl<'a, 'tcx> SigDropHelper<'a, 'tcx> {
         }
         let ty = self.cx.typeck_results().expr_ty(expr);
         if ty.is_ref() {
-            // We checked that the type was ref, so builtin_deref will return Some TypeAndMut,
-            // but let's avoid any chance of an ICE
-            if let Some(TypeAndMut { ty, .. }) = ty.builtin_deref(true) {
+            // We checked that the type was ref, so builtin_deref will return Some,
+            // but let's avoid any chance of an ICE.
+            if let Some(ty) = ty.builtin_deref(true) {
                 if ty.is_trivially_pure_clone_copy() {
                     self.replace_current_sig_drop(expr.span, false, LintSuggestion::MoveAndDerefToCopy);
                 } else if allow_move_and_clone {
diff --git a/clippy_lints/src/methods/iter_overeager_cloned.rs b/clippy_lints/src/methods/iter_overeager_cloned.rs
index 03b4680c522..5ccb5243e90 100644
--- a/clippy_lints/src/methods/iter_overeager_cloned.rs
+++ b/clippy_lints/src/methods/iter_overeager_cloned.rs
@@ -12,7 +12,6 @@ use rustc_span::sym;
 
 use super::ITER_OVEREAGER_CLONED;
 use crate::redundant_clone::REDUNDANT_CLONE;
-use crate::rustc_trait_selection::infer::TyCtxtInferExt;
 
 #[derive(Clone, Copy)]
 pub(super) enum Op<'a> {
@@ -69,16 +68,10 @@ pub(super) fn check<'tcx>(
             let mut delegate = MoveDelegate {
                 used_move: HirIdSet::default(),
             };
-            let infcx = cx.tcx.infer_ctxt().build();
-
-            ExprUseVisitor::new(
-                &mut delegate,
-                &infcx,
-                closure.body.hir_id.owner.def_id,
-                cx.param_env,
-                cx.typeck_results(),
-            )
-            .consume_body(body);
+
+            ExprUseVisitor::for_clippy(cx, closure.def_id, &mut delegate)
+                .consume_body(body)
+                .into_ok();
 
             let mut to_be_discarded = false;
 
diff --git a/clippy_lints/src/methods/unnecessary_to_owned.rs b/clippy_lints/src/methods/unnecessary_to_owned.rs
index d3347466be9..ae9aa83efd6 100644
--- a/clippy_lints/src/methods/unnecessary_to_owned.rs
+++ b/clippy_lints/src/methods/unnecessary_to_owned.rs
@@ -417,7 +417,7 @@ fn get_input_traits_and_projections<'tcx>(
                 }
             },
             ClauseKind::Projection(projection_predicate) => {
-                if projection_predicate.projection_ty.self_ty() == input {
+                if projection_predicate.projection_term.self_ty() == input {
                     projection_predicates.push(projection_predicate);
                 }
             },
diff --git a/clippy_lints/src/mismatching_type_param_order.rs b/clippy_lints/src/mismatching_type_param_order.rs
index 0842a872824..934b9f490ad 100644
--- a/clippy_lints/src/mismatching_type_param_order.rs
+++ b/clippy_lints/src/mismatching_type_param_order.rs
@@ -76,7 +76,7 @@ impl<'tcx> LateLintPass<'tcx> for TypeParamMismatch {
             };
 
             // get the names of the generic parameters in the type
-            let type_params = &cx.tcx.generics_of(defid).params;
+            let type_params = &cx.tcx.generics_of(defid).own_params;
             let type_param_names: Vec<_> = type_params
                 .iter()
                 .filter_map(|p| match p.kind {
diff --git a/clippy_lints/src/needless_borrows_for_generic_args.rs b/clippy_lints/src/needless_borrows_for_generic_args.rs
index 5219e39a2ca..daf166bad90 100644
--- a/clippy_lints/src/needless_borrows_for_generic_args.rs
+++ b/clippy_lints/src/needless_borrows_for_generic_args.rs
@@ -12,7 +12,7 @@ use rustc_index::bit_set::BitSet;
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::{
-    self, ClauseKind, EarlyBinder, FnSig, GenericArg, GenericArgKind, List, ParamTy, ProjectionPredicate, Ty,
+    self, ClauseKind, EarlyBinder, FnSig, GenericArg, GenericArgKind, ParamTy, ProjectionPredicate, Ty,
 };
 use rustc_session::impl_lint_pass;
 use rustc_span::symbol::sym;
@@ -157,7 +157,7 @@ fn path_has_args(p: &QPath<'_>) -> bool {
 fn needless_borrow_count<'tcx>(
     cx: &LateContext<'tcx>,
     fn_id: DefId,
-    callee_args: &'tcx List<GenericArg<'tcx>>,
+    callee_args: ty::GenericArgsRef<'tcx>,
     arg_index: usize,
     param_ty: ParamTy,
     mut expr: &Expr<'tcx>,
@@ -316,11 +316,11 @@ fn is_mixed_projection_predicate<'tcx>(
         && (term_param_ty.index as usize) < generics.parent_count
     {
         // The inner-most self type is a type parameter from the current function.
-        let mut projection_ty = projection_predicate.projection_ty;
+        let mut projection_term = projection_predicate.projection_term;
         loop {
-            match projection_ty.self_ty().kind() {
+            match *projection_term.self_ty().kind() {
                 ty::Alias(ty::Projection, inner_projection_ty) => {
-                    projection_ty = *inner_projection_ty;
+                    projection_term = inner_projection_ty.into();
                 },
                 ty::Param(param_ty) => {
                     return (param_ty.index as usize) >= generics.parent_count;
@@ -369,14 +369,15 @@ fn replace_types<'tcx>(
         // The `replaced.insert(...)` check provides some protection against infinite loops.
         if replaced.insert(param_ty.index) {
             for projection_predicate in projection_predicates {
-                if projection_predicate.projection_ty.self_ty() == param_ty.to_ty(cx.tcx)
+                if projection_predicate.projection_term.self_ty() == param_ty.to_ty(cx.tcx)
                     && let Some(term_ty) = projection_predicate.term.ty()
                     && let ty::Param(term_param_ty) = term_ty.kind()
                 {
-                    let projection = cx.tcx.mk_ty_from_kind(ty::Alias(
-                        ty::Projection,
-                        projection_predicate.projection_ty.with_self_ty(cx.tcx, new_ty),
-                    ));
+                    let projection = projection_predicate
+                        .projection_term
+                        .with_self_ty(cx.tcx, new_ty)
+                        .expect_ty(cx.tcx)
+                        .to_ty(cx.tcx);
 
                     if let Ok(projected_ty) = cx.tcx.try_normalize_erasing_regions(cx.param_env, projection)
                         && args[term_param_ty.index as usize] != GenericArg::from(projected_ty)
diff --git a/clippy_lints/src/needless_pass_by_ref_mut.rs b/clippy_lints/src/needless_pass_by_ref_mut.rs
index 9e47c3ad0b7..da6ed5fb96f 100644
--- a/clippy_lints/src/needless_pass_by_ref_mut.rs
+++ b/clippy_lints/src/needless_pass_by_ref_mut.rs
@@ -11,7 +11,6 @@ use rustc_hir::{
     PatKind,
 };
 use rustc_hir_typeck::expr_use_visitor as euv;
-use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::FakeReadCause;
 use rustc_middle::ty::{self, Ty, TyCtxt, UpvarId, UpvarPath};
@@ -102,7 +101,6 @@ fn should_skip<'tcx>(
 fn check_closures<'tcx>(
     ctx: &mut MutablyUsedVariablesCtxt<'tcx>,
     cx: &LateContext<'tcx>,
-    infcx: &InferCtxt<'tcx>,
     checked_closures: &mut FxHashSet<LocalDefId>,
     closures: FxHashSet<LocalDefId>,
 ) {
@@ -119,7 +117,9 @@ fn check_closures<'tcx>(
             .associated_body()
             .map(|(_, body_id)| hir.body(body_id))
         {
-            euv::ExprUseVisitor::new(ctx, infcx, closure, cx.param_env, cx.typeck_results()).consume_body(body);
+            euv::ExprUseVisitor::for_clippy(cx, closure, &mut *ctx)
+                .consume_body(body)
+                .into_ok();
         }
     }
 }
@@ -196,8 +196,9 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
                 async_closures: FxHashSet::default(),
                 tcx: cx.tcx,
             };
-            let infcx = cx.tcx.infer_ctxt().build();
-            euv::ExprUseVisitor::new(&mut ctx, &infcx, fn_def_id, cx.param_env, cx.typeck_results()).consume_body(body);
+            euv::ExprUseVisitor::for_clippy(cx, fn_def_id, &mut ctx)
+                .consume_body(body)
+                .into_ok();
 
             let mut checked_closures = FxHashSet::default();
 
@@ -210,13 +211,13 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
                 }
                 ControlFlow::<()>::Continue(())
             });
-            check_closures(&mut ctx, cx, &infcx, &mut checked_closures, closures);
+            check_closures(&mut ctx, cx, &mut checked_closures, closures);
 
             if is_async {
                 while !ctx.async_closures.is_empty() {
                     let async_closures = ctx.async_closures.clone();
                     ctx.async_closures.clear();
-                    check_closures(&mut ctx, cx, &infcx, &mut checked_closures, async_closures);
+                    check_closures(&mut ctx, cx, &mut checked_closures, async_closures);
                 }
             }
             ctx.generate_mutably_used_ids_from_aliases()
diff --git a/clippy_lints/src/needless_pass_by_value.rs b/clippy_lints/src/needless_pass_by_value.rs
index 39d374d0d27..f2e00cef7e9 100644
--- a/clippy_lints/src/needless_pass_by_value.rs
+++ b/clippy_lints/src/needless_pass_by_value.rs
@@ -13,7 +13,6 @@ use rustc_hir::{
     TyKind,
 };
 use rustc_hir_typeck::expr_use_visitor as euv;
-use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::FakeReadCause;
 use rustc_middle::ty::{self, Ty, TypeVisitableExt};
@@ -134,8 +133,9 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
         // function body.
         let MovedVariablesCtxt { moved_vars } = {
             let mut ctx = MovedVariablesCtxt::default();
-            let infcx = cx.tcx.infer_ctxt().build();
-            euv::ExprUseVisitor::new(&mut ctx, &infcx, fn_def_id, cx.param_env, cx.typeck_results()).consume_body(body);
+            euv::ExprUseVisitor::for_clippy(cx, fn_def_id, &mut ctx)
+                .consume_body(body)
+                .into_ok();
             ctx
         };
 
diff --git a/clippy_lints/src/operators/assign_op_pattern.rs b/clippy_lints/src/operators/assign_op_pattern.rs
index 435eb9048f5..910e584a7a0 100644
--- a/clippy_lints/src/operators/assign_op_pattern.rs
+++ b/clippy_lints/src/operators/assign_op_pattern.rs
@@ -11,7 +11,6 @@ use rustc_hir_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, Pl
 use rustc_lint::LateContext;
 use rustc_middle::mir::FakeReadCause;
 use rustc_middle::ty::BorrowKind;
-use rustc_trait_selection::infer::TyCtxtInferExt;
 
 use super::ASSIGN_OP_PATTERN;
 
@@ -119,15 +118,8 @@ fn imm_borrows_in_expr(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> HirIdSet {
     }
 
     let mut s = S(HirIdSet::default());
-    let infcx = cx.tcx.infer_ctxt().build();
-    let mut v = ExprUseVisitor::new(
-        &mut s,
-        &infcx,
-        cx.tcx.hir().body_owner_def_id(cx.enclosing_body.unwrap()),
-        cx.param_env,
-        cx.typeck_results(),
-    );
-    v.consume_expr(e);
+    let v = ExprUseVisitor::for_clippy(cx, e.hir_id.owner.def_id, &mut s);
+    v.consume_expr(e).into_ok();
     s.0
 }
 
@@ -151,14 +143,7 @@ fn mut_borrows_in_expr(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> HirIdSet {
     }
 
     let mut s = S(HirIdSet::default());
-    let infcx = cx.tcx.infer_ctxt().build();
-    let mut v = ExprUseVisitor::new(
-        &mut s,
-        &infcx,
-        cx.tcx.hir().body_owner_def_id(cx.enclosing_body.unwrap()),
-        cx.param_env,
-        cx.typeck_results(),
-    );
-    v.consume_expr(e);
+    let v = ExprUseVisitor::for_clippy(cx, e.hir_id.owner.def_id, &mut s);
+    v.consume_expr(e).into_ok();
     s.0
 }
diff --git a/clippy_lints/src/operators/cmp_owned.rs b/clippy_lints/src/operators/cmp_owned.rs
index ea8ed28ba62..208b20a7a06 100644
--- a/clippy_lints/src/operators/cmp_owned.rs
+++ b/clippy_lints/src/operators/cmp_owned.rs
@@ -70,7 +70,7 @@ fn check_op(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>, left: bool)
     let without_deref = symmetric_partial_eq(cx, arg_ty, other_ty).unwrap_or_default();
     let with_deref = arg_ty
         .builtin_deref(true)
-        .and_then(|tam| symmetric_partial_eq(cx, tam.ty, other_ty))
+        .and_then(|ty| symmetric_partial_eq(cx, ty, other_ty))
         .unwrap_or_default();
 
     if !with_deref.is_implemented() && !without_deref.is_implemented() {
diff --git a/clippy_lints/src/redundant_closure_call.rs b/clippy_lints/src/redundant_closure_call.rs
index 2863eb190d3..47d3ed08b8e 100644
--- a/clippy_lints/src/redundant_closure_call.rs
+++ b/clippy_lints/src/redundant_closure_call.rs
@@ -1,4 +1,3 @@
-use crate::rustc_lint::LintContext;
 use clippy_utils::diagnostics::{span_lint_and_then, span_lint_hir};
 use clippy_utils::get_parent_expr;
 use clippy_utils::sugg::Sugg;
@@ -9,7 +8,7 @@ use rustc_hir::intravisit::{Visitor as HirVisitor, Visitor};
 use rustc_hir::{
     intravisit as hir_visit, ClosureKind, CoroutineDesugaring, CoroutineKind, CoroutineSource, ExprKind, Node,
 };
-use rustc_lint::{LateContext, LateLintPass};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty;
diff --git a/clippy_lints/src/semicolon_if_nothing_returned.rs b/clippy_lints/src/semicolon_if_nothing_returned.rs
index 6540626f7d5..63237c655ef 100644
--- a/clippy_lints/src/semicolon_if_nothing_returned.rs
+++ b/clippy_lints/src/semicolon_if_nothing_returned.rs
@@ -1,9 +1,8 @@
-use crate::rustc_lint::LintContext;
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_context;
 use rustc_errors::Applicability;
 use rustc_hir::{Block, ExprKind};
-use rustc_lint::{LateContext, LateLintPass};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_session::declare_lint_pass;
 use rustc_span::{ExpnKind, MacroKind, Span};
 
diff --git a/clippy_lints/src/single_component_path_imports.rs b/clippy_lints/src/single_component_path_imports.rs
index 18fbbdb4079..acf44a9bb5a 100644
--- a/clippy_lints/src/single_component_path_imports.rs
+++ b/clippy_lints/src/single_component_path_imports.rs
@@ -201,8 +201,8 @@ impl SingleComponentPathImports {
 
                 if segments.is_empty() {
                     // keep track of `use {some_module, some_other_module};` usages
-                    if let UseTreeKind::Nested(trees) = &use_tree.kind {
-                        for tree in trees {
+                    if let UseTreeKind::Nested { items, .. } = &use_tree.kind {
+                        for tree in items {
                             let segments = &tree.0.prefix.segments;
                             if segments.len() == 1 {
                                 if let UseTreeKind::Simple(None) = tree.0.kind {
@@ -229,8 +229,8 @@ impl SingleComponentPathImports {
                         }
 
                         // nested case such as `use self::{module1::Struct1, module2::Struct2}`
-                        if let UseTreeKind::Nested(trees) = &use_tree.kind {
-                            for tree in trees {
+                        if let UseTreeKind::Nested { items, .. } = &use_tree.kind {
+                            for tree in items {
                                 let segments = &tree.0.prefix.segments;
                                 if !segments.is_empty() {
                                     imports_reused_with_self.push(segments[0].ident.name);
diff --git a/clippy_lints/src/transmute/eager_transmute.rs b/clippy_lints/src/transmute/eager_transmute.rs
index c44f5150dd1..1dfc9f7091e 100644
--- a/clippy_lints/src/transmute/eager_transmute.rs
+++ b/clippy_lints/src/transmute/eager_transmute.rs
@@ -87,7 +87,7 @@ pub(super) fn check<'tcx>(
         && is_normalizable(cx, cx.param_env, from_ty)
         && is_normalizable(cx, cx.param_env, to_ty)
         // we only want to lint if the target type has a niche that is larger than the one of the source type
-        // e.g. `u8` to `NonZeroU8` should lint, but `NonZeroU8` to `u8` should not
+        // e.g. `u8` to `NonZero<u8>` should lint, but `NonZero<u8>` to `u8` should not
         && let Ok(from_layout) = cx.tcx.layout_of(cx.param_env.and(from_ty))
         && let Ok(to_layout) = cx.tcx.layout_of(cx.param_env.and(to_ty))
         && match (from_layout.largest_niche, to_layout.largest_niche) {
diff --git a/clippy_lints/src/transmute/mod.rs b/clippy_lints/src/transmute/mod.rs
index 7fa536a1a29..598032ccdeb 100644
--- a/clippy_lints/src/transmute/mod.rs
+++ b/clippy_lints/src/transmute/mod.rs
@@ -257,7 +257,7 @@ declare_clippy_lint! {
 
 declare_clippy_lint! {
     /// ### What it does
-    /// Checks for transmutes from integers to `NonZero*` types, and suggests their `new_unchecked`
+    /// Checks for transmutes from `T` to `NonZero<T>`, and suggests the `new_unchecked`
     /// method instead.
     ///
     /// ### Why is this bad?
@@ -266,13 +266,13 @@ declare_clippy_lint! {
     ///
     /// ### Example
     /// ```no_run
-    /// # use core::num::NonZeroU32;
-    /// let _non_zero: NonZeroU32 = unsafe { std::mem::transmute(123) };
+    /// # use core::num::NonZero;
+    /// let _: NonZero<u32> = unsafe { std::mem::transmute(123) };
     /// ```
     /// Use instead:
     /// ```no_run
-    /// # use core::num::NonZeroU32;
-    /// let _non_zero = unsafe { NonZeroU32::new_unchecked(123) };
+    /// # use core::num::NonZero;
+    /// let _: NonZero<u32> = unsafe { NonZero::new_unchecked(123) };
     /// ```
     #[clippy::version = "1.69.0"]
     pub TRANSMUTE_INT_TO_NON_ZERO,
diff --git a/clippy_lints/src/transmute/transmute_int_to_non_zero.rs b/clippy_lints/src/transmute/transmute_int_to_non_zero.rs
index 2bea3be3d60..3729dfd3e86 100644
--- a/clippy_lints/src/transmute/transmute_int_to_non_zero.rs
+++ b/clippy_lints/src/transmute/transmute_int_to_non_zero.rs
@@ -26,45 +26,22 @@ pub(super) fn check<'tcx>(
         return false;
     };
 
-    // FIXME: This can be simplified once `NonZero<T>` is stable.
-    let coercible_types = [
-        ("NonZeroU8", tcx.types.u8),
-        ("NonZeroU16", tcx.types.u16),
-        ("NonZeroU32", tcx.types.u32),
-        ("NonZeroU64", tcx.types.u64),
-        ("NonZeroU128", tcx.types.u128),
-        ("NonZeroUsize", tcx.types.usize),
-        ("NonZeroI8", tcx.types.i8),
-        ("NonZeroI16", tcx.types.i16),
-        ("NonZeroI32", tcx.types.i32),
-        ("NonZeroI64", tcx.types.i64),
-        ("NonZeroI128", tcx.types.i128),
-        ("NonZeroIsize", tcx.types.isize),
-    ];
-
-    let int_type = substs.type_at(0);
-
-    let Some(nonzero_alias) = coercible_types.iter().find_map(|(nonzero_alias, t)| {
-        if *t == int_type && *t == from_ty {
-            Some(nonzero_alias)
-        } else {
-            None
-        }
-    }) else {
+    let int_ty = substs.type_at(0);
+    if from_ty != int_ty {
         return false;
-    };
+    }
 
     span_lint_and_then(
         cx,
         TRANSMUTE_INT_TO_NON_ZERO,
         e.span,
-        format!("transmute from a `{from_ty}` to a `{nonzero_alias}`"),
+        format!("transmute from a `{from_ty}` to a `{}<{int_ty}>`", sym::NonZero),
         |diag| {
             let arg = sugg::Sugg::hir(cx, arg, "..");
             diag.span_suggestion(
                 e.span,
                 "consider using",
-                format!("{nonzero_alias}::{}({arg})", sym::new_unchecked),
+                format!("{}::{}({arg})", sym::NonZero, sym::new_unchecked),
                 Applicability::Unspecified,
             );
         },
diff --git a/clippy_lints/src/unit_return_expecting_ord.rs b/clippy_lints/src/unit_return_expecting_ord.rs
index 214b69dc925..f0d1458a59b 100644
--- a/clippy_lints/src/unit_return_expecting_ord.rs
+++ b/clippy_lints/src/unit_return_expecting_ord.rs
@@ -66,7 +66,7 @@ fn get_projection_pred<'tcx>(
             let projection_pred = cx
                 .tcx
                 .instantiate_bound_regions_with_erased(proj_pred.kind().rebind(pred));
-            if projection_pred.projection_ty.args == trait_pred.trait_ref.args {
+            if projection_pred.projection_term.args == trait_pred.trait_ref.args {
                 return Some(projection_pred);
             }
         }
diff --git a/clippy_lints/src/unnecessary_self_imports.rs b/clippy_lints/src/unnecessary_self_imports.rs
index ddee06b59ca..528a1dfcfc1 100644
--- a/clippy_lints/src/unnecessary_self_imports.rs
+++ b/clippy_lints/src/unnecessary_self_imports.rs
@@ -36,8 +36,8 @@ declare_lint_pass!(UnnecessarySelfImports => [UNNECESSARY_SELF_IMPORTS]);
 impl EarlyLintPass for UnnecessarySelfImports {
     fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
         if let ItemKind::Use(use_tree) = &item.kind
-            && let UseTreeKind::Nested(nodes) = &use_tree.kind
-            && let [(self_tree, _)] = &**nodes
+            && let UseTreeKind::Nested { items, .. } = &use_tree.kind
+            && let [(self_tree, _)] = &**items
             && let [self_seg] = &*self_tree.prefix.segments
             && self_seg.ident.name == kw::SelfLower
             && let Some(last_segment) = use_tree.prefix.segments.last()
diff --git a/clippy_lints/src/unsafe_removed_from_name.rs b/clippy_lints/src/unsafe_removed_from_name.rs
index 51b3ea93b6d..309eaedac8d 100644
--- a/clippy_lints/src/unsafe_removed_from_name.rs
+++ b/clippy_lints/src/unsafe_removed_from_name.rs
@@ -49,8 +49,8 @@ fn check_use_tree(use_tree: &UseTree, cx: &EarlyContext<'_>, span: Span) {
             unsafe_to_safe_check(old_name, new_name, cx, span);
         },
         UseTreeKind::Simple(None) | UseTreeKind::Glob => {},
-        UseTreeKind::Nested(ref nested_use_tree) => {
-            for (use_tree, _) in nested_use_tree {
+        UseTreeKind::Nested { ref items, .. } => {
+            for (use_tree, _) in items {
                 check_use_tree(use_tree, cx, span);
             }
         },
diff --git a/clippy_lints/src/unwrap.rs b/clippy_lints/src/unwrap.rs
index 2622abd59cb..c0d9bcdd259 100644
--- a/clippy_lints/src/unwrap.rs
+++ b/clippy_lints/src/unwrap.rs
@@ -6,7 +6,6 @@ use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_expr, walk_fn, FnKind, Visitor};
 use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, Node, PathSegment, UnOp};
 use rustc_hir_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceWithHirId};
-use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::lint::in_external_macro;
@@ -252,16 +251,9 @@ impl<'a, 'tcx> UnwrappableVariablesVisitor<'a, 'tcx> {
                 local_id: unwrap_info.local_id,
             };
 
-            let infcx = self.cx.tcx.infer_ctxt().build();
-            let mut vis = ExprUseVisitor::new(
-                &mut delegate,
-                &infcx,
-                cond.hir_id.owner.def_id,
-                self.cx.param_env,
-                self.cx.typeck_results(),
-            );
-            vis.walk_expr(cond);
-            vis.walk_expr(branch);
+            let vis = ExprUseVisitor::for_clippy(self.cx, cond.hir_id.owner.def_id, &mut delegate);
+            vis.walk_expr(cond).into_ok();
+            vis.walk_expr(branch).into_ok();
 
             if delegate.is_mutated {
                 // if the variable is mutated, we don't know whether it can be unwrapped.