Auto merge of #10010 - flip1995:rustup, r=flip1995

Rustup

r? `@ghost`

changelog: none

clippy_dev/src/setup/git_hook.rs

@@ -6,7 +6,7 @@ use super::verify_inside_clippy_dir;
 /// Rusts setup uses `git rev-parse --git-common-dir` to get the root directory of the repo.
 /// I've decided against this for the sake of simplicity and to make sure that it doesn't install
 /// the hook if `clippy_dev` would be used in the rust tree. The hook also references this tool
-/// for formatting and should therefor only be used in a normal clone of clippy
+/// for formatting and should therefore only be used in a normal clone of clippy
 const REPO_GIT_DIR: &str = ".git";
 const HOOK_SOURCE_FILE: &str = "util/etc/pre-commit.sh";
 const HOOK_TARGET_FILE: &str = ".git/hooks/pre-commit";

clippy_lints/src/attrs.rs

@@ -5,7 +5,7 @@ use clippy_utils::macros::{is_panic, macro_backtrace};
 use clippy_utils::msrvs::{self, Msrv};
 use clippy_utils::source::{first_line_of_span, is_present_in_source, snippet_opt, without_block_comments};
 use if_chain::if_chain;
-use rustc_ast::{AttrKind, AttrStyle, Attribute, Lit, LitKind, MetaItemKind, NestedMetaItem};
+use rustc_ast::{AttrKind, AttrStyle, Attribute, LitKind, MetaItemKind, MetaItemLit, NestedMetaItem};
 use rustc_errors::Applicability;
 use rustc_hir::{
     Block, Expr, ExprKind, ImplItem, ImplItemKind, Item, ItemKind, StmtKind, TraitFn, TraitItem, TraitItemKind,
@@ -574,7 +574,7 @@ fn check_attrs(cx: &LateContext<'_>, span: Span, name: Symbol, attrs: &[Attribut
     }
 }
 
-fn check_semver(cx: &LateContext<'_>, span: Span, lit: &Lit) {
+fn check_semver(cx: &LateContext<'_>, span: Span, lit: &MetaItemLit) {
     if let LitKind::Str(is, _) = lit.kind {
         if Version::parse(is.as_str()).is_ok() {
             return;

clippy_lints/src/bool_assert_comparison.rs

@@ -59,7 +59,7 @@ fn is_impl_not_trait_with_bool_out(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
             )
         })
         .map_or(false, |assoc_item| {
-            let proj = cx.tcx.mk_projection(assoc_item.def_id, cx.tcx.mk_substs_trait(ty, &[]));
+            let proj = cx.tcx.mk_projection(assoc_item.def_id, cx.tcx.mk_substs_trait(ty, []));
             let nty = cx.tcx.normalize_erasing_regions(cx.param_env, proj);
 
             nty.is_bool()

clippy_lints/src/casts/cast_possible_truncation.rs

@@ -2,12 +2,11 @@ use clippy_utils::consts::{constant, Constant};
 use clippy_utils::diagnostics::span_lint;
 use clippy_utils::expr_or_init;
 use clippy_utils::ty::{get_discriminant_value, is_isize_or_usize};
-use rustc_ast::ast;
-use rustc_attr::IntType;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, FloatTy, Ty};
+use rustc_target::abi::IntegerType;
 
 use super::{utils, CAST_ENUM_TRUNCATION, CAST_POSSIBLE_TRUNCATION};
 
@@ -119,12 +118,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>,
             };
             let to_nbits = utils::int_ty_to_nbits(cast_to, cx.tcx);
 
-            let cast_from_ptr_size = def.repr().int.map_or(true, |ty| {
+            let cast_from_ptr_size = def.repr().int.map_or(true, |ty| matches!(ty, IntegerType::Pointer(_),));
-                matches!(
-                    ty,
-                    IntType::SignedInt(ast::IntTy::Isize) | IntType::UnsignedInt(ast::UintTy::Usize)
-                )
-            });
             let suffix = match (cast_from_ptr_size, is_isize_or_usize(cast_to)) {
                 (false, false) if from_nbits > to_nbits => "",
                 (true, false) if from_nbits > to_nbits => "",

clippy_lints/src/crate_in_macro_def.rs

@@ -55,7 +55,7 @@ impl EarlyLintPass for CrateInMacroDef {
         if_chain! {
             if item.attrs.iter().any(is_macro_export);
             if let ItemKind::MacroDef(macro_def) = &item.kind;
-            let tts = macro_def.body.inner_tokens();
+            let tts = macro_def.body.tokens.clone();
             if let Some(span) = contains_unhygienic_crate_reference(&tts);
             then {
                 span_lint_and_sugg(

clippy_lints/src/dereference.rs

@@ -26,7 +26,7 @@ use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::{Rvalue, StatementKind};
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
 use rustc_middle::ty::{
-    self, Binder, BoundVariableKind, EarlyBinder, FnSig, GenericArgKind, List, ParamTy, PredicateKind,
+    self, Binder, BoundVariableKind, Clause, EarlyBinder, FnSig, GenericArgKind, List, ParamTy, PredicateKind,
     ProjectionPredicate, Ty, TyCtxt, TypeVisitable, TypeckResults,
 };
 use rustc_session::{declare_tool_lint, impl_lint_pass};
@@ -855,14 +855,10 @@ fn walk_parents<'tcx>(
                         } else if let Some(trait_id) = cx.tcx.trait_of_item(id)
                             && let arg_ty = cx.tcx.erase_regions(cx.typeck_results().expr_ty_adjusted(e))
                             && let ty::Ref(_, sub_ty, _) = *arg_ty.kind()
-                            && let subs = match cx
+                            && let subs = cx
                                 .typeck_results()
-                                .node_substs_opt(parent.hir_id)
+                                .node_substs_opt(parent.hir_id).map(|subs| &subs[1..]).unwrap_or_default()
-                                .and_then(|subs| subs.get(1..))
+                            && let impl_ty = if cx.tcx.fn_sig(id).skip_binder().inputs()[0].is_ref() {
-                            {
-                                Some(subs) => cx.tcx.mk_substs(subs.iter().copied()),
-                                None => cx.tcx.mk_substs(std::iter::empty::<ty::subst::GenericArg<'_>>()),
-                            } && let impl_ty = if cx.tcx.fn_sig(id).skip_binder().inputs()[0].is_ref() {
                                 // Trait methods taking `&self`
                                 sub_ty
                             } else {
@@ -871,7 +867,11 @@ fn walk_parents<'tcx>(
                             } && impl_ty.is_ref()
                             && let infcx = cx.tcx.infer_ctxt().build()
                             && infcx
-                                .type_implements_trait(trait_id, impl_ty, subs, cx.param_env)
+                                .type_implements_trait(
+                                    trait_id,
+                                    [impl_ty.into()].into_iter().chain(subs.iter().copied()),
+                                    cx.param_env,
+                                )
                                 .must_apply_modulo_regions()
                         {
                             return Some(Position::MethodReceiverRefImpl)
@@ -1106,7 +1106,7 @@ fn needless_borrow_impl_arg_position<'tcx>(
     let projection_predicates = predicates
         .iter()
         .filter_map(|predicate| {
-            if let PredicateKind::Projection(projection_predicate) = predicate.kind().skip_binder() {
+            if let PredicateKind::Clause(Clause::Projection(projection_predicate)) = predicate.kind().skip_binder() {
                 Some(projection_predicate)
             } else {
                 None
@@ -1120,7 +1120,7 @@ fn needless_borrow_impl_arg_position<'tcx>(
     if predicates
         .iter()
         .filter_map(|predicate| {
-            if let PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder()
+            if let PredicateKind::Clause(Clause::Trait(trait_predicate)) = predicate.kind().skip_binder()
                 && trait_predicate.trait_ref.self_ty() == param_ty.to_ty(cx.tcx)
             {
                 Some(trait_predicate.trait_ref.def_id)
@@ -1182,7 +1182,7 @@ fn needless_borrow_impl_arg_position<'tcx>(
         }
 
         predicates.iter().all(|predicate| {
-            if let PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder()
+            if let PredicateKind::Clause(Clause::Trait(trait_predicate)) = predicate.kind().skip_binder()
                 && cx.tcx.is_diagnostic_item(sym::IntoIterator, trait_predicate.trait_ref.def_id)
                 && let ty::Param(param_ty) = trait_predicate.self_ty().kind()
                 && let GenericArgKind::Type(ty) = substs_with_referent_ty[param_ty.index as usize].unpack()
@@ -1333,7 +1333,7 @@ fn replace_types<'tcx>(
                     let item_def_id = projection_predicate.projection_ty.item_def_id;
                     let assoc_item = cx.tcx.associated_item(item_def_id);
                     let projection = cx.tcx
-                        .mk_projection(assoc_item.def_id, cx.tcx.mk_substs_trait(new_ty, &[]));
+                        .mk_projection(assoc_item.def_id, cx.tcx.mk_substs_trait(new_ty, []));
 
                     if let Ok(projected_ty) = cx.tcx.try_normalize_erasing_regions(cx.param_env, projection)
                         && substs[term_param_ty.index as usize] != ty::GenericArg::from(projected_ty)

clippy_lints/src/derive.rs

@@ -14,8 +14,8 @@ use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::traits::Reveal;
 use rustc_middle::ty::{
-    self, Binder, BoundConstness, GenericParamDefKind, ImplPolarity, ParamEnv, PredicateKind, TraitPredicate, TraitRef,
+    self, Binder, BoundConstness, Clause, GenericParamDefKind, ImplPolarity, ParamEnv, PredicateKind, TraitPredicate,
-    Ty, TyCtxt,
+    TraitRef, Ty, TyCtxt,
 };
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
@@ -466,12 +466,12 @@ fn check_partial_eq_without_eq<'tcx>(cx: &LateContext<'tcx>, span: Span, trait_r
         if let Some(def_id) = trait_ref.trait_def_id();
         if cx.tcx.is_diagnostic_item(sym::PartialEq, def_id);
         let param_env = param_env_for_derived_eq(cx.tcx, adt.did(), eq_trait_def_id);
-        if !implements_trait_with_env(cx.tcx, param_env, ty, eq_trait_def_id, &[]);
+        if !implements_trait_with_env(cx.tcx, param_env, ty, eq_trait_def_id, []);
         // If all of our fields implement `Eq`, we can implement `Eq` too
         if adt
             .all_fields()
             .map(|f| f.ty(cx.tcx, substs))
-            .all(|ty| implements_trait_with_env(cx.tcx, param_env, ty, eq_trait_def_id, &[]));
+            .all(|ty| implements_trait_with_env(cx.tcx, param_env, ty, eq_trait_def_id, []));
         then {
             span_lint_and_sugg(
                 cx,
@@ -499,7 +499,7 @@ fn param_env_for_derived_eq(tcx: TyCtxt<'_>, did: DefId, eq_trait_id: DefId) ->
 
     let ty_predicates = tcx.predicates_of(did).predicates;
     for (p, _) in ty_predicates {
-        if let PredicateKind::Trait(p) = p.kind().skip_binder()
+        if let PredicateKind::Clause(Clause::Trait(p)) = p.kind().skip_binder()
             && p.trait_ref.def_id == eq_trait_id
             && let ty::Param(self_ty) = p.trait_ref.self_ty().kind()
             && p.constness == BoundConstness::NotConst
@@ -512,14 +512,14 @@ fn param_env_for_derived_eq(tcx: TyCtxt<'_>, did: DefId, eq_trait_id: DefId) ->
     ParamEnv::new(
         tcx.mk_predicates(ty_predicates.iter().map(|&(p, _)| p).chain(
             params.iter().filter(|&&(_, needs_eq)| needs_eq).map(|&(param, _)| {
-                tcx.mk_predicate(Binder::dummy(PredicateKind::Trait(TraitPredicate {
+                tcx.mk_predicate(Binder::dummy(PredicateKind::Clause(Clause::Trait(TraitPredicate {
                     trait_ref: TraitRef::new(
                         eq_trait_id,
                         tcx.mk_substs(std::iter::once(tcx.mk_param_from_def(param))),
                     ),
                     constness: BoundConstness::NotConst,
                     polarity: ImplPolarity::Positive,
-                })))
+                }))))
             }),
         )),
         Reveal::UserFacing,

clippy_lints/src/doc.rs

@@ -427,9 +427,7 @@ fn lint_for_missing_headers(
                 let body = cx.tcx.hir().body(body_id);
                 let ret_ty = typeck.expr_ty(body.value);
                 if implements_trait(cx, ret_ty, future, &[]);
-                if let ty::Opaque(_, subs) = ret_ty.kind();
+                if let ty::Generator(_, subs, _) = ret_ty.kind();
-                if let Some(gen) = subs.types().next();
-                if let ty::Generator(_, subs, _) = gen.kind();
                 if is_type_diagnostic_item(cx, subs.as_generator().return_ty(), sym::Result);
                 then {
                     span_lint(

clippy_lints/src/eta_reduction.rs

@@ -119,11 +119,18 @@ impl<'tcx> LateLintPass<'tcx> for EtaReduction {
             let callee_ty_unadjusted = cx.typeck_results().expr_ty(callee).peel_refs();
             if !is_type_diagnostic_item(cx, callee_ty_unadjusted, sym::Arc);
             if !is_type_diagnostic_item(cx, callee_ty_unadjusted, sym::Rc);
+            if let ty::Closure(_, substs) = *closure_ty.kind();
             then {
                 span_lint_and_then(cx, REDUNDANT_CLOSURE, expr.span, "redundant closure", |diag| {
                     if let Some(mut snippet) = snippet_opt(cx, callee.span) {
                         if let Some(fn_mut_id) = cx.tcx.lang_items().fn_mut_trait()
-                            && implements_trait(cx, callee_ty.peel_refs(), fn_mut_id, &[])
+                            && let args = cx.tcx.erase_late_bound_regions(substs.as_closure().sig()).inputs()
+                            && implements_trait(
+                                   cx,
+                                   callee_ty.peel_refs(),
+                                   fn_mut_id,
+                                   &args.iter().copied().map(Into::into).collect::<Vec<_>>(),
+                               )
                             && path_to_local(callee).map_or(false, |l| local_used_after_expr(cx, l, expr))
                         {
                                 // Mutable closure is used after current expr; we cannot consume it.

clippy_lints/src/future_not_send.rs

@@ -4,7 +4,7 @@ use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Body, FnDecl, HirId};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_middle::ty::{EarlyBinder, Opaque, PredicateKind::Trait};
+use rustc_middle::ty::{Clause, EarlyBinder, Opaque, PredicateKind};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::{sym, Span};
 use rustc_trait_selection::traits::error_reporting::suggestions::TypeErrCtxtExt;
@@ -91,7 +91,9 @@ impl<'tcx> LateLintPass<'tcx> for FutureNotSend {
                                 infcx
                                     .err_ctxt()
                                     .maybe_note_obligation_cause_for_async_await(db, &obligation);
-                                if let Trait(trait_pred) = obligation.predicate.kind().skip_binder() {
+                                if let PredicateKind::Clause(Clause::Trait(trait_pred)) =
+                                    obligation.predicate.kind().skip_binder()
+                                {
                                     db.note(&format!(
                                         "`{}` doesn't implement `{}`",
                                         trait_pred.self_ty(),

clippy_lints/src/lib.rs

@@ -26,7 +26,6 @@
 extern crate rustc_arena;
 extern crate rustc_ast;
 extern crate rustc_ast_pretty;
-extern crate rustc_attr;
 extern crate rustc_data_structures;
 extern crate rustc_driver;
 extern crate rustc_errors;

clippy_lints/src/lifetimes.rs

@@ -10,8 +10,8 @@ use rustc_hir::lang_items;
 use rustc_hir::FnRetTy::Return;
 use rustc_hir::{
     BareFnTy, BodyId, FnDecl, GenericArg, GenericBound, GenericParam, GenericParamKind, Generics, Impl, ImplItem,
-    ImplItemKind, Item, ItemKind, Lifetime, LifetimeName, ParamName, PolyTraitRef, PredicateOrigin, TraitFn, TraitItem,
+    ImplItemKind, Item, ItemKind, Lifetime, LifetimeName, LifetimeParamKind, PolyTraitRef, PredicateOrigin, TraitFn,
-    TraitItemKind, Ty, TyKind, WherePredicate,
+    TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::hir::nested_filter as middle_nested_filter;
@@ -180,7 +180,7 @@ fn check_fn_inner<'tcx>(
                             _ => None,
                         });
                         for bound in lifetimes {
-                            if bound.name != LifetimeName::Static && !bound.is_elided() {
+                            if !bound.is_static() && !bound.is_elided() {
                                 return;
                             }
                         }
@@ -414,17 +414,13 @@ impl<'a, 'tcx> RefVisitor<'a, 'tcx> {
 
     fn record(&mut self, lifetime: &Option<Lifetime>) {
         if let Some(ref lt) = *lifetime {
-            if lt.name == LifetimeName::Static {
+            if lt.is_static() {
                 self.lts.push(RefLt::Static);
-            } else if let LifetimeName::Param(_, ParamName::Fresh) = lt.name {
+            } else if lt.is_anonymous() {
                 // Fresh lifetimes generated should be ignored.
                 self.lts.push(RefLt::Unnamed);
-            } else if lt.is_elided() {
+            } else if let LifetimeName::Param(def_id) = lt.res {
-                self.lts.push(RefLt::Unnamed);
-            } else if let LifetimeName::Param(def_id, _) = lt.name {
                 self.lts.push(RefLt::Named(def_id));
-            } else {
-                self.lts.push(RefLt::Unnamed);
             }
         } else {
             self.lts.push(RefLt::Unnamed);
@@ -472,7 +468,7 @@ impl<'a, 'tcx> Visitor<'tcx> for RefVisitor<'a, 'tcx> {
                 walk_item(self, item);
                 self.lts.truncate(len);
                 self.lts.extend(bounds.iter().filter_map(|bound| match bound {
-                    GenericArg::Lifetime(l) => Some(if let LifetimeName::Param(def_id, _) = l.name {
+                    GenericArg::Lifetime(l) => Some(if let LifetimeName::Param(def_id) = l.res {
                         RefLt::Named(def_id)
                     } else {
                         RefLt::Unnamed
@@ -498,10 +494,8 @@ impl<'a, 'tcx> Visitor<'tcx> for RefVisitor<'a, 'tcx> {
     }
 
     fn visit_generic_arg(&mut self, generic_arg: &'tcx GenericArg<'tcx>) {
-        if let GenericArg::Lifetime(l) = generic_arg
+        if let GenericArg::Lifetime(l) = generic_arg && let LifetimeName::Param(def_id) = l.res {
-            && let LifetimeName::Param(def_id, _) = l.name
+            self.lifetime_generic_arg_spans.entry(def_id).or_insert(l.ident.span);
-        {
-            self.lifetime_generic_arg_spans.entry(def_id).or_insert(l.span);
         }
         walk_generic_arg(self, generic_arg);
     }
@@ -570,7 +564,7 @@ where
 
     // for lifetimes as parameters of generics
     fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
-        self.map.remove(&lifetime.name.ident().name);
+        self.map.remove(&lifetime.ident.name);
     }
 
     fn visit_generic_param(&mut self, param: &'tcx GenericParam<'_>) {
@@ -594,7 +588,9 @@ fn report_extra_lifetimes<'tcx>(cx: &LateContext<'tcx>, func: &'tcx FnDecl<'_>,
         .params
         .iter()
         .filter_map(|par| match par.kind {
-            GenericParamKind::Lifetime { .. } => Some((par.name.ident().name, par.span)),
+            GenericParamKind::Lifetime {
+                kind: LifetimeParamKind::Explicit,
+            } => Some((par.name.ident().name, par.span)),
             _ => None,
         })
         .collect();
@@ -619,7 +615,9 @@ fn report_extra_impl_lifetimes<'tcx>(cx: &LateContext<'tcx>, impl_: &'tcx Impl<'
         .params
         .iter()
         .filter_map(|par| match par.kind {
-            GenericParamKind::Lifetime { .. } => Some((par.name.ident().name, par.span)),
+            GenericParamKind::Lifetime {
+                kind: LifetimeParamKind::Explicit,
+            } => Some((par.name.ident().name, par.span)),
             _ => None,
         })
         .collect();
@@ -646,7 +644,7 @@ struct BodyLifetimeChecker {
 impl<'tcx> Visitor<'tcx> for BodyLifetimeChecker {
     // for lifetimes as parameters of generics
     fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
-        if lifetime.name.ident().name != kw::UnderscoreLifetime && lifetime.name.ident().name != kw::StaticLifetime {
+        if !lifetime.is_anonymous() && lifetime.ident.name != kw::StaticLifetime {
             self.lifetimes_used_in_body = true;
         }
     }

clippy_lints/src/manual_async_fn.rs

@@ -118,7 +118,7 @@ fn future_trait_ref<'tcx>(
                 .iter()
                 .filter_map(|bound| {
                     if let GenericArg::Lifetime(lt) = bound {
-                        Some(lt.name)
+                        Some(lt.res)
                     } else {
                         None
                     }
@@ -153,7 +153,7 @@ fn captures_all_lifetimes(inputs: &[Ty<'_>], output_lifetimes: &[LifetimeName])
         .iter()
         .filter_map(|ty| {
             if let TyKind::Rptr(lt, _) = ty.kind {
-                Some(lt.name)
+                Some(lt.res)
             } else {
                 None
             }
@@ -177,7 +177,7 @@ fn desugared_async_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>)
         if let Some(args) = cx
             .tcx
             .lang_items()
-            .from_generator_fn()
+            .identity_future_fn()
             .and_then(|def_id| match_function_call_with_def_id(cx, block_expr, def_id));
         if args.len() == 1;
         if let Expr {

clippy_lints/src/matches/match_wild_enum.rs

@@ -65,14 +65,14 @@ pub(crate) fn check(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>]) {
                         _ => return,
                     };
                     if arm.guard.is_none() {
-                        missing_variants.retain(|e| e.ctor_def_id != Some(id));
+                        missing_variants.retain(|e| e.ctor_def_id() != Some(id));
                     }
                     path
                 },
                 PatKind::TupleStruct(path, patterns, ..) => {
                     if let Some(id) = cx.qpath_res(path, pat.hir_id).opt_def_id() {
                         if arm.guard.is_none() && patterns.iter().all(|p| !is_refutable(cx, p)) {
-                            missing_variants.retain(|e| e.ctor_def_id != Some(id));
+                            missing_variants.retain(|e| e.ctor_def_id() != Some(id));
                         }
                     }
                     path
@@ -122,11 +122,11 @@ pub(crate) fn check(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>]) {
                 s
             },
             variant.name,
-            match variant.ctor_kind {
+            match variant.ctor_kind() {
-                CtorKind::Fn if variant.fields.len() == 1 => "(_)",
+                Some(CtorKind::Fn) if variant.fields.len() == 1 => "(_)",
-                CtorKind::Fn => "(..)",
+                Some(CtorKind::Fn) => "(..)",
-                CtorKind::Const => "",
+                Some(CtorKind::Const) => "",
-                CtorKind::Fictive => "{ .. }",
+                None => "{ .. }",
             }
         )
     };

clippy_lints/src/matches/try_err.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_applicability;
 use clippy_utils::ty::is_type_diagnostic_item;
-use clippy_utils::{get_parent_expr, is_res_lang_ctor, match_def_path, path_res, paths};
+use clippy_utils::{get_parent_expr, is_res_lang_ctor, path_res};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::LangItem::ResultErr;
@@ -107,7 +107,7 @@ fn result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'t
 fn poll_result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
     if_chain! {
         if let ty::Adt(def, subst) = ty.kind();
-        if match_def_path(cx, def.did(), &paths::POLL);
+        if cx.tcx.lang_items().get(LangItem::Poll) == Some(def.did());
         let ready_ty = subst.type_at(0);
 
         if let ty::Adt(ready_def, ready_subst) = ready_ty.kind();
@@ -124,7 +124,7 @@ fn poll_result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<
 fn poll_option_result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
     if_chain! {
         if let ty::Adt(def, subst) = ty.kind();
-        if match_def_path(cx, def.did(), &paths::POLL);
+        if cx.tcx.lang_items().get(LangItem::Poll) == Some(def.did());
         let ready_ty = subst.type_at(0);
 
         if let ty::Adt(ready_def, ready_subst) = ready_ty.kind();

clippy_lints/src/methods/iter_overeager_cloned.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::snippet_opt;
-use clippy_utils::ty::{get_associated_type, implements_trait, is_copy};
+use clippy_utils::ty::{implements_trait, is_copy};
 use rustc_errors::Applicability;
 use rustc_hir::Expr;
 use rustc_lint::LateContext;
@@ -25,7 +25,7 @@ pub(super) fn check<'tcx>(
         && let Some(method_id) = typeck.type_dependent_def_id(cloned_call.hir_id)
         && cx.tcx.trait_of_item(method_id) == Some(iter_id)
         && let cloned_recv_ty = typeck.expr_ty_adjusted(cloned_recv)
-        && let Some(iter_assoc_ty) = get_associated_type(cx, cloned_recv_ty, iter_id, "Item")
+        && let Some(iter_assoc_ty) = cx.get_associated_type(cloned_recv_ty, iter_id, "Item")
         && matches!(*iter_assoc_ty.kind(), ty::Ref(_, ty, _) if !is_copy(cx, ty))
     {
         if needs_into_iter

clippy_lints/src/methods/unnecessary_iter_cloned.rs

@@ -2,7 +2,7 @@ use super::utils::clone_or_copy_needed;
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::higher::ForLoop;
 use clippy_utils::source::snippet_opt;
-use clippy_utils::ty::{get_associated_type, get_iterator_item_ty, implements_trait};
+use clippy_utils::ty::{get_iterator_item_ty, implements_trait};
 use clippy_utils::{fn_def_id, get_parent_expr};
 use rustc_errors::Applicability;
 use rustc_hir::{def_id::DefId, Expr, ExprKind};
@@ -54,7 +54,7 @@ pub fn check_for_loop_iter(
                 if let Some(into_iterator_trait_id) = cx.tcx.get_diagnostic_item(sym::IntoIterator);
                 let collection_ty = cx.typeck_results().expr_ty(collection);
                 if implements_trait(cx, collection_ty, into_iterator_trait_id, &[]);
-                if let Some(into_iter_item_ty) = get_associated_type(cx, collection_ty, into_iterator_trait_id, "Item");
+                if let Some(into_iter_item_ty) = cx.get_associated_type(collection_ty, into_iterator_trait_id, "Item");
 
                 if iter_item_ty == into_iter_item_ty;
                 if let Some(collection_snippet) = snippet_opt(cx, collection.span);

clippy_lints/src/methods/unnecessary_to_owned.rs

@@ -3,7 +3,7 @@ use super::unnecessary_iter_cloned::{self, is_into_iter};
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::msrvs::{self, Msrv};
 use clippy_utils::source::snippet_opt;
-use clippy_utils::ty::{get_associated_type, get_iterator_item_ty, implements_trait, is_copy, peel_mid_ty_refs};
+use clippy_utils::ty::{get_iterator_item_ty, implements_trait, is_copy, peel_mid_ty_refs};
 use clippy_utils::visitors::find_all_ret_expressions;
 use clippy_utils::{fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, return_ty};
 use rustc_errors::Applicability;
@@ -14,8 +14,7 @@ use rustc_lint::LateContext;
 use rustc_middle::mir::Mutability;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment, OverloadedDeref};
 use rustc_middle::ty::subst::{GenericArg, GenericArgKind, SubstsRef};
-use rustc_middle::ty::EarlyBinder;
+use rustc_middle::ty::{self, Clause, EarlyBinder, ParamTy, PredicateKind, ProjectionPredicate, TraitPredicate, Ty};
-use rustc_middle::ty::{self, ParamTy, PredicateKind, ProjectionPredicate, TraitPredicate, Ty};
 use rustc_span::{sym, Symbol};
 use rustc_trait_selection::traits::{query::evaluate_obligation::InferCtxtExt as _, Obligation, ObligationCause};
 
@@ -144,7 +143,7 @@ fn check_addr_of_expr(
             if_chain! {
                 if let Some(deref_trait_id) = cx.tcx.get_diagnostic_item(sym::Deref);
                 if implements_trait(cx, receiver_ty, deref_trait_id, &[]);
-                if get_associated_type(cx, receiver_ty, deref_trait_id, "Target") == Some(target_ty);
+                if cx.get_associated_type(receiver_ty, deref_trait_id, "Target") == Some(target_ty);
                 then {
                     if n_receiver_refs > 0 {
                         span_lint_and_sugg(
@@ -346,12 +345,12 @@ fn get_input_traits_and_projections<'tcx>(
     let mut projection_predicates = Vec::new();
     for predicate in cx.tcx.param_env(callee_def_id).caller_bounds() {
         match predicate.kind().skip_binder() {
-            PredicateKind::Trait(trait_predicate) => {
+            PredicateKind::Clause(Clause::Trait(trait_predicate)) => {
                 if trait_predicate.trait_ref.self_ty() == input {
                     trait_predicates.push(trait_predicate);
                 }
             },
-            PredicateKind::Projection(projection_predicate) => {
+            PredicateKind::Clause(Clause::Projection(projection_predicate)) => {
                 if projection_predicate.projection_ty.self_ty() == input {
                     projection_predicates.push(projection_predicate);
                 }
@@ -408,10 +407,12 @@ fn can_change_type<'a>(cx: &LateContext<'a>, mut expr: &'a Expr<'a>, mut ty: Ty<
 
                         let mut trait_predicates = cx.tcx.param_env(callee_def_id)
                             .caller_bounds().iter().filter(|predicate| {
-                            if let PredicateKind::Trait(trait_predicate) =  predicate.kind().skip_binder()
+                            if let PredicateKind::Clause(Clause::Trait(trait_predicate))
-                                && trait_predicate.trait_ref.self_ty() == *param_ty {
+                                    = predicate.kind().skip_binder()
-                                    true
+                                && trait_predicate.trait_ref.self_ty() == *param_ty
-                                } else {
+                            {
+                                true
+                            } else {
                                 false
                             }
                         });
@@ -483,7 +484,7 @@ fn is_cow_into_owned(cx: &LateContext<'_>, method_name: Symbol, method_def_id: D
 }
 
 /// Returns true if the named method is `ToString::to_string` and it's called on a type that
-/// is string-like i.e. implements `AsRef<str>` or `Deref<str>`.
+/// is string-like i.e. implements `AsRef<str>` or `Deref<Target = str>`.
 fn is_to_string_on_string_like<'a>(
     cx: &LateContext<'_>,
     call_expr: &'a Expr<'a>,
@@ -499,7 +500,7 @@ fn is_to_string_on_string_like<'a>(
         && let GenericArgKind::Type(ty) = generic_arg.unpack()
         && let Some(deref_trait_id) = cx.tcx.get_diagnostic_item(sym::Deref)
         && let Some(as_ref_trait_id) = cx.tcx.get_diagnostic_item(sym::AsRef)
-        && (implements_trait(cx, ty, deref_trait_id, &[cx.tcx.types.str_.into()]) ||
+        && (cx.get_associated_type(ty, deref_trait_id, "Target") == Some(cx.tcx.types.str_) ||
             implements_trait(cx, ty, as_ref_trait_id, &[cx.tcx.types.str_.into()])) {
             true
         } else {

clippy_lints/src/needless_pass_by_value.rs

@@ -1,7 +1,9 @@
 use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
 use clippy_utils::ptr::get_spans;
 use clippy_utils::source::{snippet, snippet_opt};
-use clippy_utils::ty::{implements_trait, is_copy, is_type_diagnostic_item, is_type_lang_item};
+use clippy_utils::ty::{
+    implements_trait, implements_trait_with_env, is_copy, is_type_diagnostic_item, is_type_lang_item,
+};
 use clippy_utils::{get_trait_def_id, is_self, paths};
 use if_chain::if_chain;
 use rustc_ast::ast::Attribute;
@@ -124,7 +126,9 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
             .filter_map(|obligation| {
                 // Note that we do not want to deal with qualified predicates here.
                 match obligation.predicate.kind().no_bound_vars() {
-                    Some(ty::PredicateKind::Trait(pred)) if pred.def_id() != sized_trait => Some(pred),
+                    Some(ty::PredicateKind::Clause(ty::Clause::Trait(pred))) if pred.def_id() != sized_trait => {
+                        Some(pred)
+                    },
                     _ => None,
                 }
             })
@@ -185,7 +189,7 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
                 if !ty.is_mutable_ptr();
                 if !is_copy(cx, ty);
                 if ty.is_sized(cx.tcx, cx.param_env);
-                if !allowed_traits.iter().any(|&t| implements_trait(cx, ty, t, &[]));
+                if !allowed_traits.iter().any(|&t| implements_trait_with_env(cx.tcx, cx.param_env, ty, t, [None]));
                 if !implements_borrow_trait;
                 if !all_borrowable_trait;
 

clippy_lints/src/neg_cmp_op_on_partial_ord.rs

@@ -65,7 +65,7 @@ impl<'tcx> LateLintPass<'tcx> for NoNegCompOpForPartialOrd {
 
                 let implements_partial_ord = {
                     if let Some(id) = cx.tcx.lang_items().partial_ord_trait() {
-                        implements_trait(cx, ty, id, &[])
+                        implements_trait(cx, ty, id, &[ty.into()])
                     } else {
                         return;
                     }

clippy_lints/src/ptr.rs

@@ -12,14 +12,14 @@ use rustc_hir::hir_id::HirIdMap;
 use rustc_hir::intravisit::{walk_expr, Visitor};
 use rustc_hir::{
     self as hir, AnonConst, BinOpKind, BindingAnnotation, Body, Expr, ExprKind, FnRetTy, FnSig, GenericArg,
-    ImplItemKind, ItemKind, Lifetime, LifetimeName, Mutability, Node, Param, ParamName, PatKind, QPath, TraitFn,
+    ImplItemKind, ItemKind, Lifetime, Mutability, Node, Param, PatKind, QPath, TraitFn, TraitItem, TraitItemKind,
-    TraitItem, TraitItemKind, TyKind, Unsafety,
+    TyKind, Unsafety,
 };
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_infer::traits::{Obligation, ObligationCause};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::hir::nested_filter;
-use rustc_middle::ty::{self, Binder, ExistentialPredicate, List, PredicateKind, Ty};
+use rustc_middle::ty::{self, Binder, Clause, ExistentialPredicate, List, PredicateKind, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::sym;
@@ -343,21 +343,16 @@ impl PtrArg<'_> {
 }
 
 struct RefPrefix {
-    lt: LifetimeName,
+    lt: Lifetime,
     mutability: Mutability,
 }
 impl fmt::Display for RefPrefix {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use fmt::Write;
         f.write_char('&')?;
-        match self.lt {
+        if !self.lt.is_anonymous() {
-            LifetimeName::Param(_, ParamName::Plain(name)) => {
+            self.lt.ident.fmt(f)?;
-                name.fmt(f)?;
+            f.write_char(' ')?;
-                f.write_char(' ')?;
-            },
-            LifetimeName::Infer => f.write_str("'_ ")?,
-            LifetimeName::Static => f.write_str("'static ")?,
-            _ => (),
         }
         f.write_str(self.mutability.prefix_str())
     }
@@ -495,7 +490,7 @@ fn check_fn_args<'cx, 'tcx: 'cx>(
                         ty_name: name.ident.name,
                         method_renames,
                         ref_prefix: RefPrefix {
-                            lt: lt.name,
+                            lt: *lt,
                             mutability,
                         },
                         deref_ty,
@@ -687,24 +682,24 @@ fn check_ptr_arg_usage<'tcx>(cx: &LateContext<'tcx>, body: &'tcx Body<'_>, args:
 fn matches_preds<'tcx>(
     cx: &LateContext<'tcx>,
     ty: Ty<'tcx>,
-    preds: &'tcx [Binder<'tcx, ExistentialPredicate<'tcx>>],
+    preds: &'tcx [ty::PolyExistentialPredicate<'tcx>],
 ) -> bool {
     let infcx = cx.tcx.infer_ctxt().build();
     preds.iter().all(|&p| match cx.tcx.erase_late_bound_regions(p) {
         ExistentialPredicate::Trait(p) => infcx
-            .type_implements_trait(p.def_id, ty, p.substs, cx.param_env)
+            .type_implements_trait(p.def_id, [ty.into()].into_iter().chain(p.substs.iter()), cx.param_env)
             .must_apply_modulo_regions(),
         ExistentialPredicate::Projection(p) => infcx.predicate_must_hold_modulo_regions(&Obligation::new(
             cx.tcx,
             ObligationCause::dummy(),
             cx.param_env,
-            cx.tcx.mk_predicate(Binder::bind_with_vars(
+            cx.tcx
-                PredicateKind::Projection(p.with_self_ty(cx.tcx, ty)),
+                .mk_predicate(Binder::dummy(PredicateKind::Clause(Clause::Projection(
-                List::empty(),
+                    p.with_self_ty(cx.tcx, ty),
-            )),
+                )))),
         )),
         ExistentialPredicate::AutoTrait(p) => infcx
-            .type_implements_trait(p, ty, List::empty(), cx.param_env)
+            .type_implements_trait(p, [ty], cx.param_env)
             .must_apply_modulo_regions(),
     })
 }

clippy_lints/src/suspicious_operation_groupings.rs

@@ -582,7 +582,7 @@ fn ident_difference_expr_with_base_location(
         | (Block(_, _), Block(_, _))
         | (Closure(_), Closure(_))
         | (Match(_, _), Match(_, _))
-        | (Loop(_, _), Loop(_, _))
+        | (Loop(_, _, _), Loop(_, _, _))
         | (ForLoop(_, _, _, _), ForLoop(_, _, _, _))
         | (While(_, _, _), While(_, _, _))
         | (If(_, _, _), If(_, _, _))

clippy_lints/src/types/borrowed_box.rs

@@ -31,10 +31,10 @@ pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, lt: &Lifetime, m
                         return false;
                     }
 
-                    let ltopt = if lt.name.is_anonymous() {
+                    let ltopt = if lt.is_anonymous() {
                         String::new()
                     } else {
-                        format!("{} ", lt.name.ident().as_str())
+                        format!("{} ", lt.ident.as_str())
                     };
 
                     if mut_ty.mutbl == Mutability::Mut {

clippy_lints/src/unit_return_expecting_ord.rs

@@ -4,7 +4,7 @@ use rustc_hir::def_id::DefId;
 use rustc_hir::{Closure, Expr, ExprKind, StmtKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
-use rustc_middle::ty::{GenericPredicates, PredicateKind, ProjectionPredicate, TraitPredicate};
+use rustc_middle::ty::{Clause, GenericPredicates, PredicateKind, ProjectionPredicate, TraitPredicate};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::{sym, BytePos, Span};
 
@@ -45,7 +45,7 @@ fn get_trait_predicates_for_trait_id<'tcx>(
     let mut preds = Vec::new();
     for (pred, _) in generics.predicates {
         if_chain! {
-            if let PredicateKind::Trait(poly_trait_pred) = pred.kind().skip_binder();
+            if let PredicateKind::Clause(Clause::Trait(poly_trait_pred)) = pred.kind().skip_binder();
             let trait_pred = cx.tcx.erase_late_bound_regions(pred.kind().rebind(poly_trait_pred));
             if let Some(trait_def_id) = trait_id;
             if trait_def_id == trait_pred.trait_ref.def_id;
@@ -63,7 +63,7 @@ fn get_projection_pred<'tcx>(
     trait_pred: TraitPredicate<'tcx>,
 ) -> Option<ProjectionPredicate<'tcx>> {
     generics.predicates.iter().find_map(|(proj_pred, _)| {
-        if let ty::PredicateKind::Projection(pred) = proj_pred.kind().skip_binder() {
+        if let ty::PredicateKind::Clause(Clause::Projection(pred)) = proj_pred.kind().skip_binder() {
             let projection_pred = cx.tcx.erase_late_bound_regions(proj_pred.kind().rebind(pred));
             if projection_pred.projection_ty.substs == trait_pred.trait_ref.substs {
                 return Some(projection_pred);

clippy_lints/src/utils/internal_lints/unnecessary_def_path.rs

@@ -133,11 +133,11 @@ impl UnnecessaryDefPath {
                 let has_ctor = match cx.tcx.def_kind(def_id) {
                     DefKind::Struct => {
                         let variant = cx.tcx.adt_def(def_id).non_enum_variant();
-                        variant.ctor_def_id.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
+                        variant.ctor.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
                     },
                     DefKind::Variant => {
                         let variant = cx.tcx.adt_def(cx.tcx.parent(def_id)).variant_with_id(def_id);
-                        variant.ctor_def_id.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
+                        variant.ctor.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
                     },
                     _ => false,
                 };

clippy_utils/src/ast_utils.rs

@@ -171,7 +171,7 @@ pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
         (ForLoop(lp, li, lt, ll), ForLoop(rp, ri, rt, rl)) => {
             eq_label(ll, rl) && eq_pat(lp, rp) && eq_expr(li, ri) && eq_block(lt, rt)
         },
-        (Loop(lt, ll), Loop(rt, rl)) => eq_label(ll, rl) && eq_block(lt, rt),
+        (Loop(lt, ll, _), Loop(rt, rl, _)) => eq_label(ll, rl) && eq_block(lt, rt),
         (Block(lb, ll), Block(rb, rl)) => eq_label(ll, rl) && eq_block(lb, rb),
         (TryBlock(l), TryBlock(r)) => eq_block(l, r),
         (Yield(l), Yield(r)) | (Ret(l), Ret(r)) => eq_expr_opt(l, r),
@@ -396,7 +396,7 @@ pub fn eq_item_kind(l: &ItemKind, r: &ItemKind) -> bool {
                 && over(li, ri, |l, r| eq_item(l, r, eq_assoc_item_kind))
         },
         (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
-        (MacroDef(l), MacroDef(r)) => l.macro_rules == r.macro_rules && eq_mac_args(&l.body, &r.body),
+        (MacroDef(l), MacroDef(r)) => l.macro_rules == r.macro_rules && eq_delim_args(&l.body, &r.body),
         _ => false,
     }
 }
@@ -717,7 +717,7 @@ pub fn eq_assoc_constraint(l: &AssocConstraint, r: &AssocConstraint) -> bool {
 }
 
 pub fn eq_mac_call(l: &MacCall, r: &MacCall) -> bool {
-    eq_path(&l.path, &r.path) && eq_mac_args(&l.args, &r.args)
+    eq_path(&l.path, &r.path) && eq_delim_args(&l.args, &r.args)
 }
 
 pub fn eq_attr(l: &Attribute, r: &Attribute) -> bool {
@@ -725,18 +725,22 @@ pub fn eq_attr(l: &Attribute, r: &Attribute) -> bool {
     l.style == r.style
         && match (&l.kind, &r.kind) {
             (DocComment(l1, l2), DocComment(r1, r2)) => l1 == r1 && l2 == r2,
-            (Normal(l), Normal(r)) => eq_path(&l.item.path, &r.item.path) && eq_mac_args(&l.item.args, &r.item.args),
+            (Normal(l), Normal(r)) => eq_path(&l.item.path, &r.item.path) && eq_attr_args(&l.item.args, &r.item.args),
             _ => false,
         }
 }
 
-pub fn eq_mac_args(l: &MacArgs, r: &MacArgs) -> bool {
+pub fn eq_attr_args(l: &AttrArgs, r: &AttrArgs) -> bool {
-    use MacArgs::*;
+    use AttrArgs::*;
     match (l, r) {
         (Empty, Empty) => true,
-        (Delimited(_, ld, lts), Delimited(_, rd, rts)) => ld == rd && lts.eq_unspanned(rts),
+        (Delimited(la), Delimited(ra)) => eq_delim_args(la, ra),
-        (Eq(_, MacArgsEq::Ast(le)), Eq(_, MacArgsEq::Ast(re))) => eq_expr(le, re),
+        (Eq(_, AttrArgsEq::Ast(le)), Eq(_, AttrArgsEq::Ast(re))) => eq_expr(le, re),
-        (Eq(_, MacArgsEq::Hir(ll)), Eq(_, MacArgsEq::Hir(rl))) => ll.kind == rl.kind,
+        (Eq(_, AttrArgsEq::Hir(ll)), Eq(_, AttrArgsEq::Hir(rl))) => ll.kind == rl.kind,
         _ => false,
     }
 }
+
+pub fn eq_delim_args(l: &DelimArgs, r: &DelimArgs) -> bool {
+    l.delim == r.delim && l.tokens.eq_unspanned(&r.tokens)
+}

clippy_utils/src/eager_or_lazy.rs

@@ -73,7 +73,7 @@ fn fn_eagerness(cx: &LateContext<'_>, fn_id: DefId, name: Symbol, have_one_arg:
             .flat_map(|v| v.fields.iter())
             .any(|x| matches!(cx.tcx.type_of(x.did).peel_refs().kind(), ty::Param(_)))
             && all_predicates_of(cx.tcx, fn_id).all(|(pred, _)| match pred.kind().skip_binder() {
-                PredicateKind::Trait(pred) => cx.tcx.trait_def(pred.trait_ref.def_id).is_marker,
+                PredicateKind::Clause(ty::Clause::Trait(pred)) => cx.tcx.trait_def(pred.trait_ref.def_id).is_marker,
                 _ => true,
             })
             && subs.types().all(|x| matches!(x.peel_refs().kind(), ty::Param(_)))

clippy_utils/src/hir_utils.rs

@@ -7,7 +7,7 @@ use rustc_hir::def::Res;
 use rustc_hir::HirIdMap;
 use rustc_hir::{
     ArrayLen, BinOpKind, BindingAnnotation, Block, BodyId, Closure, Expr, ExprField, ExprKind, FnRetTy, GenericArg,
-    GenericArgs, Guard, HirId, InlineAsmOperand, Let, Lifetime, LifetimeName, ParamName, Pat, PatField, PatKind, Path,
+    GenericArgs, Guard, HirId, InlineAsmOperand, Let, Lifetime, LifetimeName, Pat, PatField, PatKind, Path,
     PathSegment, PrimTy, QPath, Stmt, StmtKind, Ty, TyKind, TypeBinding,
 };
 use rustc_lexer::{tokenize, TokenKind};
@@ -113,7 +113,7 @@ impl HirEqInterExpr<'_, '_, '_> {
                     }
                 }
 
-                // eq_pat adds the HirIds to the locals map. We therefor call it last to make sure that
+                // eq_pat adds the HirIds to the locals map. We therefore call it last to make sure that
                 // these only get added if the init and type is equal.
                 both(&l.init, &r.init, |l, r| self.eq_expr(l, r))
                     && both(&l.ty, &r.ty, |l, r| self.eq_ty(l, r))
@@ -337,7 +337,7 @@ impl HirEqInterExpr<'_, '_, '_> {
     }
 
     fn eq_lifetime(left: &Lifetime, right: &Lifetime) -> bool {
-        left.name == right.name
+        left.res == right.res
     }
 
     fn eq_pat_field(&mut self, left: &PatField<'_>, right: &PatField<'_>) -> bool {
@@ -925,16 +925,10 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
     }
 
     pub fn hash_lifetime(&mut self, lifetime: &Lifetime) {
-        std::mem::discriminant(&lifetime.name).hash(&mut self.s);
+        lifetime.ident.name.hash(&mut self.s);
-        if let LifetimeName::Param(param_id, ref name) = lifetime.name {
+        std::mem::discriminant(&lifetime.res).hash(&mut self.s);
-            std::mem::discriminant(name).hash(&mut self.s);
+        if let LifetimeName::Param(param_id) = lifetime.res {
             param_id.hash(&mut self.s);
-            match name {
-                ParamName::Plain(ref ident) => {
-                    ident.name.hash(&mut self.s);
-                },
-                ParamName::Fresh | ParamName::Error => {},
-            }
         }
     }
 

clippy_utils/src/paths.rs

@@ -74,7 +74,6 @@ pub const PEEKABLE: [&str; 5] = ["core", "iter", "adapters", "peekable", "Peekab
 pub const PERMISSIONS: [&str; 3] = ["std", "fs", "Permissions"];
 #[cfg_attr(not(unix), allow(clippy::invalid_paths))]
 pub const PERMISSIONS_FROM_MODE: [&str; 6] = ["std", "os", "unix", "fs", "PermissionsExt", "from_mode"];
-pub const POLL: [&str; 4] = ["core", "task", "poll", "Poll"];
 pub const PTR_COPY: [&str; 3] = ["core", "intrinsics", "copy"];
 pub const PTR_COPY_NONOVERLAPPING: [&str; 3] = ["core", "intrinsics", "copy_nonoverlapping"];
 pub const PTR_EQ: [&str; 3] = ["core", "ptr", "eq"];

clippy_utils/src/qualify_min_const_fn.rs

@@ -26,18 +26,21 @@ pub fn is_min_const_fn<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, msrv: &Msrv)
         let predicates = tcx.predicates_of(current);
         for (predicate, _) in predicates.predicates {
             match predicate.kind().skip_binder() {
-                ty::PredicateKind::RegionOutlives(_)
+                ty::PredicateKind::Clause(
-                | ty::PredicateKind::TypeOutlives(_)
+                    ty::Clause::RegionOutlives(_)
+                    | ty::Clause::TypeOutlives(_)
+                    | ty::Clause::Projection(_)
+                    | ty::Clause::Trait(..),
+                )
                 | ty::PredicateKind::WellFormed(_)
-                | ty::PredicateKind::Projection(_)
                 | ty::PredicateKind::ConstEvaluatable(..)
                 | ty::PredicateKind::ConstEquate(..)
-                | ty::PredicateKind::Trait(..)
                 | ty::PredicateKind::TypeWellFormedFromEnv(..) => continue,
                 ty::PredicateKind::ObjectSafe(_) => panic!("object safe predicate on function: {predicate:#?}"),
                 ty::PredicateKind::ClosureKind(..) => panic!("closure kind predicate on function: {predicate:#?}"),
                 ty::PredicateKind::Subtype(_) => panic!("subtype predicate on function: {predicate:#?}"),
                 ty::PredicateKind::Coerce(_) => panic!("coerce predicate on function: {predicate:#?}"),
+                ty::PredicateKind::Ambiguous => panic!("ambiguous predicate on function: {predicate:#?}"),
             }
         }
         match predicates.parent {

clippy_utils/src/ty.rs

@@ -9,20 +9,23 @@ use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::{Expr, FnDecl, LangItem, TyKind, Unsafety};
-use rustc_infer::infer::TyCtxtInferExt;
+use rustc_infer::infer::{
+    type_variable::{TypeVariableOrigin, TypeVariableOriginKind},
+    TyCtxtInferExt,
+};
 use rustc_lint::LateContext;
 use rustc_middle::mir::interpret::{ConstValue, Scalar};
 use rustc_middle::ty::{
-    self, AdtDef, AssocKind, Binder, BoundRegion, DefIdTree, FnSig, GenericParamDefKind, IntTy, List, ParamEnv,
+    self, AdtDef, AssocKind, Binder, BoundRegion, DefIdTree, FnSig, IntTy, List, ParamEnv, Predicate, PredicateKind,
-    Predicate, PredicateKind, ProjectionTy, Region, RegionKind, SubstsRef, Ty, TyCtxt, TypeSuperVisitable,
+    ProjectionTy, Region, RegionKind, SubstsRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor, UintTy,
-    TypeVisitable, TypeVisitor, UintTy, VariantDef, VariantDiscr,
+    VariantDef, VariantDiscr,
 };
 use rustc_middle::ty::{GenericArg, GenericArgKind};
 use rustc_span::symbol::Ident;
-use rustc_span::{sym, Span, Symbol};
+use rustc_span::{sym, Span, Symbol, DUMMY_SP};
 use rustc_target::abi::{Size, VariantIdx};
 use rustc_trait_selection::infer::InferCtxtExt;
-use rustc_trait_selection::traits::query::normalize::AtExt;
+use rustc_trait_selection::traits::query::normalize::QueryNormalizeExt;
 use std::iter;
 
 use crate::{match_def_path, path_res, paths};
@@ -81,7 +84,7 @@ pub fn contains_ty_adt_constructor_opaque<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'
                     match predicate.kind().skip_binder() {
                         // For `impl Trait<U>`, it will register a predicate of `T: Trait<U>`, so we go through
                         // and check substituions to find `U`.
-                        ty::PredicateKind::Trait(trait_predicate) => {
+                        ty::PredicateKind::Clause(ty::Clause::Trait(trait_predicate)) => {
                             if trait_predicate
                                 .trait_ref
                                 .substs
@@ -94,7 +97,7 @@ pub fn contains_ty_adt_constructor_opaque<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'
                         },
                         // For `impl Trait<Assoc=U>`, it will register a predicate of `<T as Trait>::Assoc = U`,
                         // so we check the term for `U`.
-                        ty::PredicateKind::Projection(projection_predicate) => {
+                        ty::PredicateKind::Clause(ty::Clause::Projection(projection_predicate)) => {
                             if let ty::TermKind::Ty(ty) = projection_predicate.term.unpack() {
                                 if contains_ty_adt_constructor_opaque(cx, ty, needle) {
                                     return true;
@@ -117,24 +120,7 @@ pub fn contains_ty_adt_constructor_opaque<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'
 pub fn get_iterator_item_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
     cx.tcx
         .get_diagnostic_item(sym::Iterator)
-        .and_then(|iter_did| get_associated_type(cx, ty, iter_did, "Item"))
+        .and_then(|iter_did| cx.get_associated_type(ty, iter_did, "Item"))
-}
-
-/// Returns the associated type `name` for `ty` as an implementation of `trait_id`.
-/// Do not invoke without first verifying that the type implements the trait.
-pub fn get_associated_type<'tcx>(
-    cx: &LateContext<'tcx>,
-    ty: Ty<'tcx>,
-    trait_id: DefId,
-    name: &str,
-) -> Option<Ty<'tcx>> {
-    cx.tcx
-        .associated_items(trait_id)
-        .find_by_name_and_kind(cx.tcx, Ident::from_str(name), ty::AssocKind::Type, trait_id)
-        .and_then(|assoc| {
-            let proj = cx.tcx.mk_projection(assoc.def_id, cx.tcx.mk_substs_trait(ty, &[]));
-            cx.tcx.try_normalize_erasing_regions(cx.param_env, proj).ok()
-        })
 }
 
 /// Get the diagnostic name of a type, e.g. `sym::HashMap`. To check if a type
@@ -206,7 +192,13 @@ pub fn implements_trait<'tcx>(
     trait_id: DefId,
     ty_params: &[GenericArg<'tcx>],
 ) -> bool {
-    implements_trait_with_env(cx.tcx, cx.param_env, ty, trait_id, ty_params)
+    implements_trait_with_env(
+        cx.tcx,
+        cx.param_env,
+        ty,
+        trait_id,
+        ty_params.iter().map(|&arg| Some(arg)),
+    )
 }
 
 /// Same as `implements_trait` but allows using a `ParamEnv` different from the lint context.
@@ -215,7 +207,7 @@ pub fn implements_trait_with_env<'tcx>(
     param_env: ParamEnv<'tcx>,
     ty: Ty<'tcx>,
     trait_id: DefId,
-    ty_params: &[GenericArg<'tcx>],
+    ty_params: impl IntoIterator<Item = Option<GenericArg<'tcx>>>,
 ) -> bool {
     // Clippy shouldn't have infer types
     assert!(!ty.needs_infer());
@@ -224,10 +216,18 @@ pub fn implements_trait_with_env<'tcx>(
     if ty.has_escaping_bound_vars() {
         return false;
     }
-    let ty_params = tcx.mk_substs(ty_params.iter());
     let infcx = tcx.infer_ctxt().build();
+    let orig = TypeVariableOrigin {
+        kind: TypeVariableOriginKind::MiscVariable,
+        span: DUMMY_SP,
+    };
+    let ty_params = tcx.mk_substs(
+        ty_params
+            .into_iter()
+            .map(|arg| arg.unwrap_or_else(|| infcx.next_ty_var(orig).into())),
+    );
     infcx
-        .type_implements_trait(trait_id, ty, ty_params, param_env)
+        .type_implements_trait(trait_id, [ty.into()].into_iter().chain(ty_params), param_env)
         .must_apply_modulo_regions()
 }
 
@@ -252,7 +252,7 @@ pub fn is_must_use_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
         ty::Tuple(substs) => substs.iter().any(|ty| is_must_use_ty(cx, ty)),
         ty::Opaque(def_id, _) => {
             for (predicate, _) in cx.tcx.explicit_item_bounds(*def_id) {
-                if let ty::PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder() {
+                if let ty::PredicateKind::Clause(ty::Clause::Trait(trait_predicate)) = predicate.kind().skip_binder() {
                     if cx.tcx.has_attr(trait_predicate.trait_ref.def_id, sym::must_use) {
                         return true;
                     }
@@ -296,7 +296,7 @@ fn is_normalizable_helper<'tcx>(
     cache.insert(ty, false);
     let infcx = cx.tcx.infer_ctxt().build();
     let cause = rustc_middle::traits::ObligationCause::dummy();
-    let result = if infcx.at(&cause, param_env).normalize(ty).is_ok() {
+    let result = if infcx.at(&cause, param_env).query_normalize(ty).is_ok() {
         match ty.kind() {
             ty::Adt(def, substs) => def.variants().iter().all(|variant| {
                 variant
@@ -671,7 +671,7 @@ fn sig_from_bounds<'tcx>(
 
     for pred in predicates {
         match pred.kind().skip_binder() {
-            PredicateKind::Trait(p)
+            PredicateKind::Clause(ty::Clause::Trait(p))
                 if (lang_items.fn_trait() == Some(p.def_id())
                     || lang_items.fn_mut_trait() == Some(p.def_id())
                     || lang_items.fn_once_trait() == Some(p.def_id()))
@@ -684,7 +684,7 @@ fn sig_from_bounds<'tcx>(
                 }
                 inputs = Some(i);
             },
-            PredicateKind::Projection(p)
+            PredicateKind::Clause(ty::Clause::Projection(p))
                 if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output()
                     && p.projection_ty.self_ty() == ty =>
             {
@@ -712,7 +712,7 @@ fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: ProjectionTy<'tcx>) -> O
         .subst_iter_copied(cx.tcx, ty.substs)
     {
         match pred.kind().skip_binder() {
-            PredicateKind::Trait(p)
+            PredicateKind::Clause(ty::Clause::Trait(p))
                 if (lang_items.fn_trait() == Some(p.def_id())
                     || lang_items.fn_mut_trait() == Some(p.def_id())
                     || lang_items.fn_once_trait() == Some(p.def_id())) =>
@@ -725,7 +725,9 @@ fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: ProjectionTy<'tcx>) -> O
                 }
                 inputs = Some(i);
             },
-            PredicateKind::Projection(p) if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output() => {
+            PredicateKind::Clause(ty::Clause::Projection(p))
+                if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output() =>
+            {
                 if output.is_some() {
                     // Multiple different fn trait impls. Is this even allowed?
                     return None;
@@ -900,7 +902,7 @@ pub fn ty_is_fn_once_param<'tcx>(tcx: TyCtxt<'_>, ty: Ty<'tcx>, predicates: &'tc
     predicates
         .iter()
         .try_fold(false, |found, p| {
-            if let PredicateKind::Trait(p) = p.kind().skip_binder()
+            if let PredicateKind::Clause(ty::Clause::Trait(p)) = p.kind().skip_binder()
             && let ty::Param(self_ty) = p.trait_ref.self_ty().kind()
             && ty.index == self_ty.index
         {
@@ -1010,7 +1012,7 @@ pub fn make_projection<'tcx>(
                     the given arguments are: `{substs:#?}`",
                 assoc_item.def_id,
                 substs.len(),
-                params.map(GenericParamDefKind::descr).collect::<Vec<_>>(),
+                params.map(ty::GenericParamDefKind::descr).collect::<Vec<_>>(),
             );
 
             if let Some((idx, (param, arg))) = params
@@ -1020,9 +1022,9 @@ pub fn make_projection<'tcx>(
                 .find(|(_, (param, arg))| {
                     !matches!(
                         (param, arg),
-                        (GenericParamDefKind::Lifetime, GenericArgKind::Lifetime(_))
+                        (ty::GenericParamDefKind::Lifetime, GenericArgKind::Lifetime(_))
-                            | (GenericParamDefKind::Type { .. }, GenericArgKind::Type(_))
+                            | (ty::GenericParamDefKind::Type { .. }, GenericArgKind::Type(_))
-                            | (GenericParamDefKind::Const { .. }, GenericArgKind::Const(_))
+                            | (ty::GenericParamDefKind::Const { .. }, GenericArgKind::Const(_))
                     )
                 })
             {
@@ -1032,7 +1034,7 @@ pub fn make_projection<'tcx>(
                         note: the expected parameters are {:#?}\n\
                         the given arguments are {substs:#?}",
                     param.descr(),
-                    params.map(GenericParamDefKind::descr).collect::<Vec<_>>()
+                    params.map(ty::GenericParamDefKind::descr).collect::<Vec<_>>()
                 );
             }
         }

declare_clippy_lint/Cargo.toml

@@ -11,3 +11,6 @@ proc-macro = true
 itertools = "0.10.1"
 quote = "1.0.21"
 syn = "1.0.100"
+
+[features]
+deny-warnings = []

declare_clippy_lint/src/lib.rs

@@ -1,5 +1,7 @@
 #![feature(let_chains)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
 
 use proc_macro::TokenStream;
 use quote::{format_ident, quote};
@@ -29,7 +31,7 @@ struct ClippyLint {
 }
 
 impl Parse for ClippyLint {
-    fn parse(input: ParseStream) -> Result<Self> {
+    fn parse(input: ParseStream<'_>) -> Result<Self> {
         let attrs = input.call(Attribute::parse_outer)?;
 
         let mut in_code = false;

rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2022-11-21"
+channel = "nightly-2022-12-01"
 components = ["cargo", "llvm-tools", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]

src/driver.rs

@@ -1,6 +1,7 @@
 #![feature(rustc_private)]
 #![feature(let_chains)]
 #![feature(once_cell)]
+#![feature(lint_reasons)]
 #![cfg_attr(feature = "deny-warnings", deny(warnings))]
 // warn on lints, that are included in `rust-lang/rust`s bootstrap
 #![warn(rust_2018_idioms, unused_lifetimes)]
@@ -90,11 +91,16 @@ fn track_files(parse_sess: &mut ParseSess, conf_path_string: Option<String>) {
 
     // During development track the `clippy-driver` executable so that cargo will re-run clippy whenever
     // it is rebuilt
-    if cfg!(debug_assertions)
+    #[expect(
-        && let Ok(current_exe) = env::current_exe()
+        clippy::collapsible_if,
-        && let Some(current_exe) = current_exe.to_str()
+        reason = "Due to a bug in let_chains this if statement can't be collapsed"
-    {
+    )]
-        file_depinfo.insert(Symbol::intern(current_exe));
+    if cfg!(debug_assertions) {
+        if let Ok(current_exe) = env::current_exe()
+            && let Some(current_exe) = current_exe.to_str()
+        {
+            file_depinfo.insert(Symbol::intern(current_exe));
+        }
     }
 }
 

tests/ui-internal/unnecessary_def_path_hardcoded_path.stderr

@@ -1,12 +1,3 @@
-error: hardcoded path to a language item
-  --> $DIR/unnecessary_def_path_hardcoded_path.rs:11:40
-   |
-LL |     const DEREF_MUT_TRAIT: [&str; 4] = ["core", "ops", "deref", "DerefMut"];
-   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = help: convert all references to use `LangItem::DerefMut`
-   = note: `-D clippy::unnecessary-def-path` implied by `-D warnings`
-
 error: hardcoded path to a diagnostic item
   --> $DIR/unnecessary_def_path_hardcoded_path.rs:10:36
    |
@@ -14,6 +5,7 @@ LL |     const DEREF_TRAIT: [&str; 4] = ["core", "ops", "deref", "Deref"];
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: convert all references to use `sym::Deref`
+   = note: `-D clippy::unnecessary-def-path` implied by `-D warnings`
 
 error: hardcoded path to a diagnostic item
   --> $DIR/unnecessary_def_path_hardcoded_path.rs:12:43
@@ -23,5 +15,13 @@ LL |     const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref",
    |
    = help: convert all references to use `sym::deref_method`
 
+error: hardcoded path to a language item
+  --> $DIR/unnecessary_def_path_hardcoded_path.rs:11:40
+   |
+LL |     const DEREF_MUT_TRAIT: [&str; 4] = ["core", "ops", "deref", "DerefMut"];
+   |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: convert all references to use `LangItem::DerefMut`
+
 error: aborting due to 3 previous errors
 

tests/ui/async_yields_async.stderr

@@ -2,14 +2,14 @@ error: an async construct yields a type which is itself awaitable
   --> $DIR/async_yields_async.rs:39:9
    |
 LL |        let _h = async {
-   |   ____________________-
+   |  _____________________-
-LL |  |         async {
+LL | |          async {
-   |  |_________^
+   | | _________^
 LL | ||             3
 LL | ||         }
    | ||_________^ awaitable value not awaited
-LL |  |     };
+LL | |      };
-   |  |_____- outer async construct
+   | |______- outer async construct
    |
    = note: `-D clippy::async-yields-async` implied by `-D warnings`
 help: consider awaiting this value
@@ -36,14 +36,14 @@ error: an async construct yields a type which is itself awaitable
   --> $DIR/async_yields_async.rs:50:9
    |
 LL |        let _j = async || {
-   |   _______________________-
+   |  ________________________-
-LL |  |         async {
+LL | |          async {
-   |  |_________^
+   | | _________^
 LL | ||             3
 LL | ||         }
    | ||_________^ awaitable value not awaited
-LL |  |     };
+LL | |      };
-   |  |_____- outer async construct
+   | |______- outer async construct
    |
 help: consider awaiting this value
    |

tests/ui/author/blocks.stdout

@@ -45,7 +45,7 @@ if let ExprKind::Closure(CaptureBy::Value, fn_decl, body_id, _, None) = expr.kin
     && expr1 = &cx.tcx.hir().body(body_id).value
     && let ExprKind::Call(func, args) = expr1.kind
     && let ExprKind::Path(ref qpath) = func.kind
-    && matches!(qpath, QPath::LangItem(LangItem::FromGenerator, _))
+    && matches!(qpath, QPath::LangItem(LangItem::IdentityFuture, _))
     && args.len() == 1
     && let ExprKind::Closure(CaptureBy::Value, fn_decl1, body_id1, _, Some(Movability::Static)) = args[0].kind
     && let FnRetTy::DefaultReturn(_) = fn_decl1.output

tests/ui/result_map_unit_fn_unfixable.stderr

@@ -20,14 +20,14 @@ error: called `map(f)` on an `Result` value where `f` is a closure that returns
   --> $DIR/result_map_unit_fn_unfixable.rs:29:5
    |
 LL |        x.field.map(|value| {
-   |   _____^
+   |  ______^
-   |  |_____|
+   | | _____|
    | ||
 LL | ||         do_nothing(value);
 LL | ||         do_nothing(value)
 LL | ||     });
    | ||______^- help: try this: `if let Ok(value) = x.field { ... }`
-   | |_______|
+   |  |______|
    | 
 
 error: called `map(f)` on an `Result` value where `f` is a closure that returns the unit type `()`