Auto merge of #5392 - matthiaskrgr:rustup_40, r=phansch

rustup  https://github.com/rust-lang/rust/pull/70536

changelog: none

clippy_lints/src/as_conversions.rs

@@ -1,6 +1,6 @@
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::{Expr, ExprKind};
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::span_lint_and_help;

clippy_lints/src/assign_ops.rs

@@ -3,11 +3,11 @@ use crate::utils::{
 };
 use crate::utils::{higher, sugg};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/atomic_ordering.rs

@@ -1,9 +1,9 @@
 use crate::utils::{match_def_path, span_lint_and_help};
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/attrs.rs

@@ -6,8 +6,6 @@ use crate::utils::{
     span_lint_and_then, without_block_comments,
 };
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
-use rustc::ty;
 use rustc_ast::ast::{AttrKind, AttrStyle, Attribute, Lit, LitKind, MetaItemKind, NestedMetaItem};
 use rustc_ast::util::lev_distance::find_best_match_for_name;
 use rustc_errors::Applicability;
@@ -15,6 +13,8 @@ use rustc_hir::{
     Block, Expr, ExprKind, ImplItem, ImplItemKind, Item, ItemKind, StmtKind, TraitFn, TraitItem, TraitItemKind,
 };
 use rustc_lint::{CheckLintNameResult, EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::symbol::Symbol;

clippy_lints/src/block_in_if_condition.rs

@@ -1,10 +1,10 @@
 use crate::utils::{differing_macro_contexts, higher, snippet_block_with_applicability, span_lint, span_lint_and_sugg};
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{BlockCheckMode, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/booleans.rs

@@ -3,12 +3,12 @@ use crate::utils::{
     span_lint_and_then, SpanlessEq,
 };
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_expr, FnKind, NestedVisitorMap, Visitor};
 use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/bytecount.rs

@@ -3,11 +3,11 @@ use crate::utils::{
     span_lint_and_sugg, walk_ptrs_ty,
 };
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_ast::ast::{Name, UintTy};
 use rustc_errors::Applicability;
 use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/checked_conversions.rs

@@ -1,11 +1,11 @@
 //! lint on manually implemented checked conversions that could be transformed into `try_from`
 
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::{BinOp, BinOpKind, Expr, ExprKind, QPath, TyKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::{snippet_with_applicability, span_lint_and_sugg, SpanlessEq};

clippy_lints/src/cognitive_complexity.rs

@@ -1,10 +1,10 @@
 //! calculate cognitive complexity and warn about overly complex functions
 
-use rustc::hir::map::Map;
 use rustc_ast::ast::Attribute;
 use rustc_hir::intravisit::{walk_expr, FnKind, NestedVisitorMap, Visitor};
 use rustc_hir::{Body, Expr, ExprKind, FnDecl, HirId};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
 use rustc_span::BytePos;

clippy_lints/src/consts.rs

@@ -2,14 +2,14 @@
 
 use crate::utils::{clip, higher, sext, unsext};
 use if_chain::if_chain;
-use rustc::ty::subst::{Subst, SubstsRef};
-use rustc::ty::{self, Ty, TyCtxt};
-use rustc::{bug, span_bug};
 use rustc_ast::ast::{FloatTy, LitFloatType, LitKind};
 use rustc_data_structures::sync::Lrc;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{BinOp, BinOpKind, Block, Expr, ExprKind, HirId, QPath, UnOp};
 use rustc_lint::LateContext;
+use rustc_middle::ty::subst::{Subst, SubstsRef};
+use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_middle::{bug, span_bug};
 use rustc_span::symbol::Symbol;
 use std::cmp::Ordering::{self, Equal};
 use std::convert::TryInto;
@@ -333,7 +333,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
                     .tcx
                     .const_eval_resolve(self.param_env, def_id, substs, None, None)
                     .ok()
-                    .map(|val| rustc::ty::Const::from_value(self.lcx.tcx, val, ty))?;
+                    .map(|val| rustc_middle::ty::Const::from_value(self.lcx.tcx, val, ty))?;
                 let result = miri_to_const(&result);
                 if result.is_some() {
                     self.needed_resolution = true;
@@ -460,7 +460,7 @@ impl<'c, 'cc> ConstEvalLateContext<'c, 'cc> {
 }
 
 pub fn miri_to_const(result: &ty::Const<'_>) -> Option<Constant> {
-    use rustc::mir::interpret::{ConstValue, Scalar};
+    use rustc_middle::mir::interpret::{ConstValue, Scalar};
     match result.val {
         ty::ConstKind::Value(ConstValue::Scalar(Scalar::Raw { data: d, .. })) => match result.ty.kind {
             ty::Bool => Some(Constant::Bool(d == 1)),

clippy_lints/src/copies.rs

@@ -1,9 +1,9 @@
 use crate::utils::{get_parent_expr, higher, if_sequence, same_tys, snippet, span_lint_and_note, span_lint_and_then};
 use crate::utils::{SpanlessEq, SpanlessHash};
-use rustc::ty::Ty;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::{Arm, Block, Expr, ExprKind, MatchSource, Pat, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::Ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol::Symbol;
 use std::collections::hash_map::Entry;

clippy_lints/src/default_trait_access.rs

@@ -1,8 +1,8 @@
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, QPath};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::{any_parent_is_automatically_derived, match_def_path, paths, span_lint_and_sugg};

clippy_lints/src/derive.rs

@@ -1,9 +1,9 @@
 use crate::utils::paths;
 use crate::utils::{is_automatically_derived, is_copy, match_path, span_lint_and_then};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
 use rustc_hir::{Item, ItemKind, TraitRef};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/doc.rs

@@ -1,12 +1,12 @@
 use crate::utils::{implements_trait, is_entrypoint_fn, match_type, paths, return_ty, span_lint};
 use if_chain::if_chain;
 use itertools::Itertools;
-use rustc::lint::in_external_macro;
-use rustc::ty;
 use rustc_ast::ast::{AttrKind, Attribute};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::{BytePos, MultiSpan, Span};
 use rustc_span::Pos;

clippy_lints/src/drop_forget_ref.rs

@@ -1,8 +1,8 @@
 use crate::utils::{is_copy, match_def_path, paths, qpath_res, span_lint_and_note};
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/else_if_without_else.rs

@@ -1,8 +1,8 @@
 //! Lint on if expressions with an else if, but without a final else branch.
 
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::{Expr, ExprKind};
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::span_lint_and_help;

clippy_lints/src/entry.rs

@@ -2,11 +2,11 @@ use crate::utils::SpanlessEq;
 use crate::utils::{get_item_name, higher, match_type, paths, snippet, snippet_opt};
 use crate::utils::{snippet_with_applicability, span_lint_and_then, walk_ptrs_ty};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{BorrowKind, Expr, ExprKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/enum_clike.rs

@@ -3,11 +3,11 @@
 
 use crate::consts::{miri_to_const, Constant};
 use crate::utils::span_lint;
-use rustc::ty;
-use rustc::ty::util::IntTypeExt;
 use rustc_ast::ast::{IntTy, UintTy};
 use rustc_hir::{Item, ItemKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_middle::ty::util::IntTypeExt;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use std::convert::TryFrom;
 
@@ -51,7 +51,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnportableVariant {
                         .tcx
                         .const_eval_poly(def_id)
                         .ok()
-                        .map(|val| rustc::ty::Const::from_value(cx.tcx, val, ty));
+                        .map(|val| rustc_middle::ty::Const::from_value(cx.tcx, val, ty));
                     if let Some(Constant::Int(val)) = constant.and_then(miri_to_const) {
                         if let ty::Adt(adt, _) = ty.kind {
                             if adt.is_enum() {

clippy_lints/src/escape.rs

@@ -1,9 +1,9 @@
-use rustc::ty::layout::LayoutOf;
-use rustc::ty::{self, Ty};
 use rustc_hir::intravisit;
 use rustc_hir::{self, Body, FnDecl, HirId, HirIdSet, ItemKind, Node};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::layout::LayoutOf;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
 use rustc_typeck::expr_use_visitor::{ConsumeMode, Delegate, ExprUseVisitor, Place, PlaceBase};
@@ -92,7 +92,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for BoxedLocal {
 }
 
 // TODO: Replace with Map::is_argument(..) when it's fixed
-fn is_argument(map: rustc::hir::map::Map<'_>, id: HirId) -> bool {
+fn is_argument(map: rustc_middle::hir::map::Map<'_>, id: HirId) -> bool {
     match map.find(id) {
         Some(Node::Binding(_)) => (),
         _ => return false,

clippy_lints/src/eta_reduction.rs

@@ -1,9 +1,9 @@
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
-use rustc::ty::{self, Ty};
 use rustc_errors::Applicability;
 use rustc_hir::{def_id, Expr, ExprKind, Param, PatKind, QPath};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::{

clippy_lints/src/eval_order_dependence.rs

@@ -1,10 +1,10 @@
 use crate::utils::{get_parent_expr, span_lint, span_lint_and_note};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::ty;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{def, BinOpKind, Block, Expr, ExprKind, Guard, HirId, Local, Node, QPath, Stmt, StmtKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/fallible_impl_from.rs

@@ -1,10 +1,10 @@
 use crate::utils::paths::{BEGIN_PANIC, BEGIN_PANIC_FMT, FROM_TRAIT, OPTION, RESULT};
 use crate::utils::{is_expn_of, match_def_path, method_chain_args, span_lint_and_then, walk_ptrs_ty};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::ty::{self, Ty};
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::Span;
 

clippy_lints/src/float_literal.rs

@@ -1,10 +1,10 @@
 use crate::utils::{numeric_literal, span_lint_and_sugg};
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_ast::ast::{FloatTy, LitFloatType, LitKind};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use std::{f32, f64, fmt};
 

clippy_lints/src/floating_point_arithmetic.rs

@@ -4,10 +4,10 @@ use crate::consts::{
 };
 use crate::utils::{higher, numeric_literal, span_lint_and_sugg, sugg, SpanlessEq};
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Spanned;
 

clippy_lints/src/format.rs

@@ -91,7 +91,7 @@ fn on_argumentv1_new<'a, 'tcx>(
         if pats.len() == 1;
         then {
             let ty = walk_ptrs_ty(cx.tables.pat_ty(&pats[0]));
-            if ty.kind != rustc::ty::Str && !match_type(cx, ty, &paths::STRING) {
+            if ty.kind != rustc_middle::ty::Str && !match_type(cx, ty, &paths::STRING) {
                 return None;
             }
             if let ExprKind::Lit(ref lit) = format_args.kind {

clippy_lints/src/formatting.rs

@@ -1,8 +1,8 @@
 use crate::utils::{differing_macro_contexts, snippet_opt, span_lint_and_help, span_lint_and_note};
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::{BinOpKind, Block, Expr, ExprKind, StmtKind, UnOp};
 use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/functions.rs

@@ -3,9 +3,6 @@ use crate::utils::{
     must_use_attr, qpath_res, return_ty, snippet, snippet_opt, span_lint, span_lint_and_help, span_lint_and_then,
     trait_ref_of_method, type_is_unsafe_function,
 };
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
-use rustc::ty::{self, Ty};
 use rustc_ast::ast::Attribute;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
@@ -13,6 +10,9 @@ use rustc_hir as hir;
 use rustc_hir::intravisit;
 use rustc_hir::{def::Res, def_id::DefId};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
 use rustc_target::spec::abi::Abi;

clippy_lints/src/identity_op.rs

@@ -1,6 +1,6 @@
-use rustc::ty;
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/if_not_else.rs

@@ -1,9 +1,9 @@
 //! lint on if branches that could be swapped so no `!` operation is necessary
 //! on the condition
 
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::{BinOpKind, Expr, ExprKind, UnOp};
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::span_lint_and_help;

clippy_lints/src/indexing_slicing.rs

@@ -2,10 +2,10 @@
 
 use crate::consts::{constant, Constant};
 use crate::utils::{higher, span_lint, span_lint_and_help};
-use rustc::ty;
 use rustc_ast::ast::RangeLimits;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/large_enum_variant.rs

@@ -1,10 +1,10 @@
 //! lint when there is a large size difference between variants on an enum
 
 use crate::utils::{snippet_opt, span_lint_and_then};
-use rustc::ty::layout::LayoutOf;
 use rustc_errors::Applicability;
 use rustc_hir::{Item, ItemKind, VariantData};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 
 declare_clippy_lint! {

clippy_lints/src/large_stack_arrays.rs

@@ -1,7 +1,7 @@
-use rustc::mir::interpret::ConstValue;
-use rustc::ty::{self, ConstKind};
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::mir::interpret::ConstValue;
+use rustc_middle::ty::{self, ConstKind};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 
 use if_chain::if_chain;

clippy_lints/src/len_zero.rs

@@ -1,11 +1,11 @@
 use crate::utils::{get_item_name, snippet_with_applicability, span_lint, span_lint_and_sugg, walk_ptrs_ty};
-use rustc::ty;
 use rustc_ast::ast::{LitKind, Name};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{AssocItemKind, BinOpKind, Expr, ExprKind, ImplItemRef, Item, ItemKind, TraitItemRef};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::{Span, Spanned};
 

clippy_lints/src/let_if_seq.rs

@@ -1,12 +1,12 @@
 use crate::utils::{higher, qpath_res, snippet, span_lint_and_then};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::def::Res;
 use rustc_hir::intravisit;
 use rustc_hir::BindingAnnotation;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/let_underscore.rs

@@ -1,7 +1,7 @@
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_hir::{PatKind, Stmt, StmtKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::{is_must_use_func_call, is_must_use_ty, match_type, paths, span_lint_and_help};

clippy_lints/src/lib.rs

@@ -18,8 +18,6 @@
 #[allow(unused_extern_crates)]
 extern crate fmt_macros;
 #[allow(unused_extern_crates)]
-extern crate rustc;
-#[allow(unused_extern_crates)]
 extern crate rustc_ast;
 #[allow(unused_extern_crates)]
 extern crate rustc_ast_pretty;
@@ -44,6 +42,8 @@ extern crate rustc_lexer;
 #[allow(unused_extern_crates)]
 extern crate rustc_lint;
 #[allow(unused_extern_crates)]
+extern crate rustc_middle;
+#[allow(unused_extern_crates)]
 extern crate rustc_mir;
 #[allow(unused_extern_crates)]
 extern crate rustc_parse;
@@ -82,7 +82,7 @@ use rustc_session::Session;
 /// ```
 /// # #![feature(rustc_private)]
 /// # #[allow(unused_extern_crates)]
-/// # extern crate rustc;
+/// # extern crate rustc_middle;
 /// # #[allow(unused_extern_crates)]
 /// # extern crate rustc_session;
 /// # #[macro_use]

clippy_lints/src/lifetimes.rs

@@ -1,5 +1,3 @@
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::{
@@ -12,6 +10,8 @@ use rustc_hir::{
     TyKind, WhereClause, WherePredicate,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::symbol::kw;

clippy_lints/src/literal_representation.rs

@@ -7,10 +7,10 @@ use crate::utils::{
     snippet_opt, span_lint_and_sugg,
 };
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::{Expr, ExprKind, Lit, LitKind};
 use rustc_errors::Applicability;
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass};
 
 declare_clippy_lint! {

clippy_lints/src/loops.rs

@@ -11,10 +11,6 @@ use crate::utils::{
 use crate::utils::{is_type_diagnostic_item, qpath_res, same_tys, sext, sugg};
 use if_chain::if_chain;
 use itertools::Itertools;
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
-use rustc::middle::region;
-use rustc::ty::{self, Ty};
 use rustc_ast::ast;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::Applicability;
@@ -26,6 +22,10 @@ use rustc_hir::{
 };
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::middle::region;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::{BytePos, Symbol};

clippy_lints/src/map_clone.rs

@@ -3,11 +3,11 @@ use crate::utils::{
     is_copy, match_trait_method, match_type, remove_blocks, snippet_with_applicability, span_lint_and_sugg,
 };
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_ast::ast::Ident;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/map_unit_fn.rs

@@ -1,10 +1,10 @@
 use crate::utils::paths;
 use crate::utils::{iter_input_pats, match_type, method_chain_args, snippet, span_lint_and_then};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/matches.rs

@@ -9,8 +9,6 @@ use crate::utils::{
     walk_ptrs_ty,
 };
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
-use rustc::ty::{self, Ty};
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::def::CtorKind;
@@ -19,6 +17,8 @@ use rustc_hir::{
     QPath, RangeEnd,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
 use std::cmp::Ordering;

clippy_lints/src/mem_replace.rs

@@ -3,10 +3,10 @@ use crate::utils::{
     span_lint_and_sugg, span_lint_and_then,
 };
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_errors::Applicability;
 use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, QPath};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/methods/inefficient_to_string.rs

@@ -1,10 +1,10 @@
 use super::INEFFICIENT_TO_STRING;
 use crate::utils::{match_def_path, paths, snippet_with_applicability, span_lint_and_then, walk_ptrs_ty_depth};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
 
 /// Checks for the `INEFFICIENT_TO_STRING` lint
 pub fn lint<'tcx>(cx: &LateContext<'_, 'tcx>, expr: &hir::Expr<'_>, arg: &hir::Expr<'_>, arg_ty: Ty<'tcx>) {

clippy_lints/src/methods/mod.rs

@@ -8,14 +8,14 @@ use std::fmt;
 use std::iter;
 
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
-use rustc::ty::{self, Predicate, Ty};
 use rustc_ast::ast;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::{self, Visitor};
 use rustc_lint::{LateContext, LateLintPass, Lint, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, Predicate, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::symbol::{sym, Symbol, SymbolStr};

clippy_lints/src/methods/option_map_unwrap_or.rs

@@ -1,11 +1,11 @@
 use crate::utils::{differing_macro_contexts, paths, snippet_with_applicability, span_lint_and_then};
 use crate::utils::{is_copy, match_type};
-use rustc::hir::map::Map;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_path, NestedVisitorMap, Visitor};
 use rustc_hir::{self, HirId, Path};
 use rustc_lint::LateContext;
+use rustc_middle::hir::map::Map;
 use rustc_span::source_map::Span;
 use rustc_span::symbol::Symbol;
 

clippy_lints/src/methods/unnecessary_filter_map.rs

@@ -1,11 +1,11 @@
 use crate::utils::paths;
 use crate::utils::usage::mutated_variables;
 use crate::utils::{match_qpath, match_trait_method, span_lint};
-use rustc::hir::map::Map;
 use rustc_hir as hir;
 use rustc_hir::def::Res;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_lint::LateContext;
+use rustc_middle::hir::map::Map;
 
 use if_chain::if_chain;
 

clippy_lints/src/misc.rs

@@ -1,5 +1,4 @@
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
@@ -8,6 +7,7 @@ use rustc_hir::{
     TyKind, UnOp,
 };
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::{ExpnKind, Span};
 

clippy_lints/src/misc_early.rs

@@ -3,7 +3,6 @@ use crate::utils::{
     span_lint_and_then,
 };
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::{
     BindingMode, Block, Expr, ExprKind, GenericParamKind, Generics, Lit, LitFloatType, LitIntType, LitKind, Mutability,
     NodeId, Pat, PatKind, StmtKind, UnOp,
@@ -12,6 +11,7 @@ use rustc_ast::visit::{walk_expr, FnKind, Visitor};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::Applicability;
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/missing_const_for_fn.rs

@@ -1,9 +1,9 @@
 use crate::utils::{fn_has_unsatisfiable_preds, has_drop, is_entrypoint_fn, span_lint, trait_ref_of_method};
-use rustc::lint::in_external_macro;
 use rustc_hir as hir;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Body, Constness, FnDecl, GenericParamKind, HirId};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
 use rustc_mir::transform::qualify_min_const_fn::is_min_const_fn;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::Span;

clippy_lints/src/missing_doc.rs

@@ -7,11 +7,11 @@
 
 use crate::utils::span_lint;
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_ast::ast::{self, MetaItem, MetaItemKind};
 use rustc_ast::attr;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::ty;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
 

clippy_lints/src/missing_inline.rs

@@ -81,7 +81,7 @@ declare_lint_pass!(MissingInline => [MISSING_INLINE_IN_PUBLIC_ITEMS]);
 
 impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingInline {
     fn check_item(&mut self, cx: &LateContext<'a, 'tcx>, it: &'tcx hir::Item<'_>) {
-        if rustc::lint::in_external_macro(cx.sess(), it.span) || is_executable(cx) {
+        if rustc_middle::lint::in_external_macro(cx.sess(), it.span) || is_executable(cx) {
             return;
         }
 
@@ -130,8 +130,8 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MissingInline {
     }
 
     fn check_impl_item(&mut self, cx: &LateContext<'a, 'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
-        use rustc::ty::{ImplContainer, TraitContainer};
-        if rustc::lint::in_external_macro(cx.sess(), impl_item.span) || is_executable(cx) {
+        use rustc_middle::ty::{ImplContainer, TraitContainer};
+        if rustc_middle::lint::in_external_macro(cx.sess(), impl_item.span) || is_executable(cx) {
             return;
         }
 

clippy_lints/src/modulo_arithmetic.rs

@@ -1,9 +1,9 @@
 use crate::consts::{constant, Constant};
 use crate::utils::{sext, span_lint_and_then};
 use if_chain::if_chain;
-use rustc::ty::{self};
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use std::fmt::Display;
 

clippy_lints/src/mut_key.rs

@@ -1,7 +1,7 @@
 use crate::utils::{match_def_path, paths, span_lint, trait_ref_of_method, walk_ptrs_ty};
-use rustc::ty::{Adt, Array, RawPtr, Ref, Slice, Tuple, Ty, TypeAndMut};
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{Adt, Array, RawPtr, Ref, Slice, Tuple, Ty, TypeAndMut};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/mut_mut.rs

@@ -1,10 +1,10 @@
 use crate::utils::{higher, span_lint};
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
-use rustc::ty;
 use rustc_hir as hir;
 use rustc_hir::intravisit;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/mut_reference.rs

@@ -1,8 +1,8 @@
 use crate::utils::span_lint;
-use rustc::ty::subst::Subst;
-use rustc::ty::{self, Ty};
 use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::subst::Subst;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/mutable_debug_assertion.rs

@@ -1,10 +1,10 @@
 use crate::utils::{is_direct_expn_of, span_lint};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::ty;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{BorrowKind, Expr, ExprKind, MatchSource, Mutability, StmtKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::Span;
 

clippy_lints/src/mutex_atomic.rs

@@ -3,10 +3,10 @@
 //! This lint is **warn** by default
 
 use crate::utils::{match_type, paths, span_lint};
-use rustc::ty::{self, Ty};
 use rustc_ast::ast;
 use rustc_hir::Expr;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/needless_borrow.rs

@@ -4,11 +4,11 @@
 
 use crate::utils::{snippet_opt, span_lint_and_then};
 use if_chain::if_chain;
-use rustc::ty;
-use rustc::ty::adjustment::{Adjust, Adjustment};
 use rustc_errors::Applicability;
 use rustc_hir::{BindingAnnotation, BorrowKind, Expr, ExprKind, HirId, Item, Mutability, Pat, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_middle::ty::adjustment::{Adjust, Adjustment};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 
 declare_clippy_lint! {

clippy_lints/src/needless_pass_by_value.rs

@@ -4,7 +4,6 @@ use crate::utils::{
     snippet, snippet_opt, span_lint_and_then,
 };
 use if_chain::if_chain;
-use rustc::ty::{self, TypeFoldable};
 use rustc_ast::ast::Attribute;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{Applicability, DiagnosticBuilder};
@@ -12,6 +11,7 @@ use rustc_hir::intravisit::FnKind;
 use rustc_hir::{BindingAnnotation, Body, FnDecl, GenericArg, HirId, ItemKind, Node, PatKind, QPath, TyKind};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, TypeFoldable};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::{Span, Symbol};
 use rustc_target::spec::abi::Abi;

clippy_lints/src/needless_update.rs

@@ -1,7 +1,7 @@
 use crate::utils::span_lint;
-use rustc::ty;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/neg_cmp_op_on_partial_ord.rs

@@ -1,7 +1,7 @@
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::{self, paths, span_lint};

clippy_lints/src/new_without_default.rs

@@ -2,13 +2,13 @@ use crate::utils::paths;
 use crate::utils::sugg::DiagnosticBuilderExt;
 use crate::utils::{get_trait_def_id, implements_trait, return_ty, same_tys, span_lint_hir_and_then};
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
-use rustc::ty::{self, Ty};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::HirIdSet;
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
 

clippy_lints/src/non_copy_const.rs

@@ -4,11 +4,11 @@
 
 use std::ptr;
 
-use rustc::ty::adjustment::Adjust;
-use rustc::ty::{Ty, TypeFlags};
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{Expr, ExprKind, ImplItem, ImplItemKind, Item, ItemKind, Node, TraitItem, TraitItemKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass, Lint};
+use rustc_middle::ty::adjustment::Adjust;
+use rustc_middle::ty::{Ty, TypeFlags};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::{InnerSpan, Span, DUMMY_SP};
 use rustc_typeck::hir_ty_to_ty;

clippy_lints/src/ptr.rs

@@ -6,13 +6,13 @@ use crate::utils::{
     walk_ptrs_hir_ty,
 };
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir::{
     BinOpKind, BodyId, Expr, ExprKind, FnDecl, FnRetTy, GenericArg, HirId, ImplItem, ImplItemKind, Item, ItemKind,
     Lifetime, MutTy, Mutability, Node, PathSegment, QPath, TraitFn, TraitItem, TraitItemKind, Ty, TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::{MultiSpan, Symbol};

clippy_lints/src/redundant_clone.rs

@@ -3,17 +3,17 @@ use crate::utils::{
     span_lint_hir_and_then, walk_ptrs_ty_depth,
 };
 use if_chain::if_chain;
-use rustc::mir::{
-    self, traversal,
-    visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor as _},
-};
-use rustc::ty::{self, fold::TypeVisitor, Ty};
 use rustc_data_structures::{fx::FxHashMap, transitive_relation::TransitiveRelation};
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{def_id, Body, FnDecl, HirId};
 use rustc_index::bit_set::{BitSet, HybridBitSet};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::mir::{
+    self, traversal,
+    visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor as _},
+};
+use rustc_middle::ty::{self, fold::TypeVisitor, Ty};
 use rustc_mir::dataflow::BottomValue;
 use rustc_mir::dataflow::{Analysis, AnalysisDomain, GenKill, GenKillAnalysis, ResultsCursor};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
@@ -335,7 +335,7 @@ fn base_local_and_movability<'tcx>(
     mir: &mir::Body<'tcx>,
     place: mir::Place<'tcx>,
 ) -> Option<(mir::Local, CannotMoveOut)> {
-    use rustc::mir::PlaceRef;
+    use rustc_middle::mir::PlaceRef;
 
     // Dereference. You cannot move things out from a borrowed value.
     let mut deref = false;
@@ -556,7 +556,7 @@ impl TypeVisitor<'_> for ContainsRegion {
 }
 
 fn rvalue_locals(rvalue: &mir::Rvalue<'_>, mut visit: impl FnMut(mir::Local)) {
-    use rustc::mir::Rvalue::{Aggregate, BinaryOp, Cast, CheckedBinaryOp, Repeat, UnaryOp, Use};
+    use rustc_middle::mir::Rvalue::{Aggregate, BinaryOp, Cast, CheckedBinaryOp, Repeat, UnaryOp, Use};
 
     let mut visit_op = |op: &mir::Operand<'_>| match op {
         mir::Operand::Copy(p) | mir::Operand::Move(p) => visit(p.local),

clippy_lints/src/returns.rs

@@ -1,9 +1,9 @@
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_ast::ast;
 use rustc_ast::visit::FnKind;
 use rustc_errors::Applicability;
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 use rustc_span::BytePos;

clippy_lints/src/shadow.rs

@@ -1,13 +1,13 @@
 use crate::reexport::Name;
 use crate::utils::{contains_name, higher, iter_input_pats, snippet, span_lint_and_then};
-use rustc::lint::in_external_macro;
-use rustc::ty;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{
     Block, Body, Expr, ExprKind, FnDecl, Guard, HirId, Local, MutTy, Pat, PatKind, Path, QPath, StmtKind, Ty, TyKind,
     UnOp,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/slow_vector_initialization.rs

@@ -1,12 +1,12 @@
 use crate::utils::sugg::Sugg;
 use crate::utils::{get_enclosing_block, match_qpath, span_lint_and_then, SpanlessEq};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_block, walk_expr, walk_stmt, NestedVisitorMap, Visitor};
 use rustc_hir::{BindingAnnotation, Block, Expr, ExprKind, HirId, PatKind, QPath, Stmt, StmtKind};
 use rustc_lint::{LateContext, LateLintPass, Lint};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol::Symbol;
 

clippy_lints/src/strings.rs

@@ -1,7 +1,7 @@
-use rustc::lint::in_external_macro;
 use rustc_errors::Applicability;
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Spanned;
 

clippy_lints/src/suspicious_trait_impl.rs

@@ -1,9 +1,9 @@
 use crate::utils::{get_trait_def_id, span_lint, trait_ref_of_method};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_hir as hir;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/swap.rs

@@ -4,10 +4,10 @@ use crate::utils::{
     span_lint_and_then, walk_ptrs_ty, SpanlessEq,
 };
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir::{Block, Expr, ExprKind, PatKind, QPath, StmtKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::Symbol;
 

clippy_lints/src/to_digit_is_some.rs

@@ -1,9 +1,9 @@
 use crate::utils::{match_def_path, snippet_with_applicability, span_lint_and_sugg};
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/transmute.rs

@@ -2,11 +2,11 @@ use crate::utils::{
     is_normalizable, last_path_segment, match_def_path, paths, snippet, span_lint, span_lint_and_then, sugg,
 };
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
 use rustc_ast::ast;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, GenericArg, Mutability, QPath, TyKind, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use std::borrow::Cow;
 

clippy_lints/src/transmuting_null.rs

@@ -1,10 +1,10 @@
 use crate::consts::{constant_context, Constant};
 use crate::utils::{match_qpath, paths, span_lint};
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
 use rustc_ast::ast::LitKind;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/trivially_copy_pass_by_ref.rs

@@ -2,12 +2,12 @@ use std::cmp;
 
 use crate::utils::{is_copy, is_self_ty, snippet, span_lint_and_sugg};
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Body, FnDecl, HirId, ItemKind, MutTy, Mutability, Node};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
 use rustc_session::config::Config as SessionConfig;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::Span;

clippy_lints/src/try_err.rs

@@ -1,10 +1,10 @@
 use crate::utils::{match_qpath, paths, snippet, snippet_with_macro_callsite, span_lint_and_sugg};
 use if_chain::if_chain;
-use rustc::lint::in_external_macro;
-use rustc::ty::Ty;
 use rustc_errors::Applicability;
 use rustc_hir::{Arm, Expr, ExprKind, MatchSource};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::Ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {

clippy_lints/src/types.rs

@@ -5,10 +5,6 @@ use std::cmp::Ordering;
 use std::collections::BTreeMap;
 
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
-use rustc::ty::layout::LayoutOf;
-use rustc::ty::{self, InferTy, Ty, TyCtxt, TypeckTables};
 use rustc_ast::ast::{FloatTy, IntTy, LitFloatType, LitIntType, LitKind, UintTy};
 use rustc_errors::{Applicability, DiagnosticBuilder};
 use rustc_hir as hir;
@@ -19,6 +15,10 @@ use rustc_hir::{
     TraitItem, TraitItemKind, TyKind, UnOp,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::layout::LayoutOf;
+use rustc_middle::ty::{self, InferTy, Ty, TyCtxt, TypeckTables};
 use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass};
 use rustc_span::hygiene::{ExpnKind, MacroKind};
 use rustc_span::source_map::Span;

clippy_lints/src/unused_self.rs

@@ -1,9 +1,9 @@
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_hir::def::Res;
 use rustc_hir::intravisit::{walk_path, NestedVisitorMap, Visitor};
 use rustc_hir::{AssocItemKind, HirId, ImplItem, ImplItemKind, ImplItemRef, ItemKind, Path};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 use crate::utils::span_lint_and_help;

clippy_lints/src/unwrap.rs

@@ -1,10 +1,10 @@
 use crate::utils::{higher::if_block, match_type, paths, span_lint_and_then, usage::is_potentially_mutated};
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
 use rustc_hir::intravisit::{walk_expr, walk_fn, FnKind, NestedVisitorMap, Visitor};
 use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, Path, QPath, UnOp};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

clippy_lints/src/use_self.rs

@@ -1,8 +1,4 @@
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::lint::in_external_macro;
-use rustc::ty;
-use rustc::ty::{DefIdTree, Ty};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
@@ -12,6 +8,10 @@ use rustc_hir::{
     TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
+use rustc_middle::ty::{DefIdTree, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol::kw;
 

clippy_lints/src/utils/author.rs

@@ -2,7 +2,6 @@
 //! to generate a clippy lint detecting said code automatically.
 
 use crate::utils::{get_attr, higher};
-use rustc::hir::map::Map;
 use rustc_ast::ast::{Attribute, LitFloatType, LitKind};
 use rustc_ast::walk_list;
 use rustc_data_structures::fx::FxHashMap;
@@ -10,6 +9,7 @@ use rustc_hir as hir;
 use rustc_hir::intravisit::{NestedVisitorMap, Visitor};
 use rustc_hir::{BindingAnnotation, Block, Expr, ExprKind, Pat, PatKind, QPath, Stmt, StmtKind, TyKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::map::Map;
 use rustc_session::Session;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 

clippy_lints/src/utils/higher.rs

@@ -5,10 +5,10 @@
 
 use crate::utils::{is_expn_of, match_def_path, match_qpath, paths};
 use if_chain::if_chain;
-use rustc::ty;
 use rustc_ast::ast;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
+use rustc_middle::ty;
 
 /// Converts a hir binary operator to the corresponding `ast` type.
 #[must_use]

clippy_lints/src/utils/hir_utils.rs

@@ -1,7 +1,5 @@
 use crate::consts::{constant_context, constant_simple};
 use crate::utils::differing_macro_contexts;
-use rustc::ich::StableHashingContextProvider;
-use rustc::ty::TypeckTables;
 use rustc_ast::ast::Name;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_hir::{
@@ -10,6 +8,8 @@ use rustc_hir::{
     TyKind, TypeBinding,
 };
 use rustc_lint::LateContext;
+use rustc_middle::ich::StableHashingContextProvider;
+use rustc_middle::ty::TypeckTables;
 use std::hash::Hash;
 
 /// Type used to check whether two ast are the same. This is different from the

clippy_lints/src/utils/internal_lints.rs

@@ -3,7 +3,6 @@ use crate::utils::{
     walk_ptrs_ty,
 };
 use if_chain::if_chain;
-use rustc::hir::map::Map;
 use rustc_ast::ast::{Crate as AstCrate, ItemKind, LitKind, Name, NodeId};
 use rustc_ast::visit::FnKind;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
@@ -13,6 +12,7 @@ use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{Crate, Expr, ExprKind, HirId, Item, MutTy, Mutability, Path, Ty, TyKind};
 use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass};
+use rustc_middle::hir::map::Map;
 use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::{Span, Spanned};
 use rustc_span::symbol::SymbolStr;

clippy_lints/src/utils/mod.rs

@@ -25,14 +25,6 @@ use std::borrow::Cow;
 use std::mem;
 
 use if_chain::if_chain;
-use rustc::hir::map::Map;
-use rustc::traits;
-use rustc::ty::{
-    self,
-    layout::{self, IntegerExt},
-    subst::GenericArg,
-    Binder, Ty, TyCtxt, TypeFoldable,
-};
 use rustc_ast::ast::{self, Attribute, LitKind};
 use rustc_attr as attr;
 use rustc_errors::Applicability;
@@ -47,6 +39,14 @@ use rustc_hir::{
 };
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, Level, Lint, LintContext};
+use rustc_middle::hir::map::Map;
+use rustc_middle::traits;
+use rustc_middle::ty::{
+    self,
+    layout::{self, IntegerExt},
+    subst::GenericArg,
+    Binder, Ty, TyCtxt, TypeFoldable,
+};
 use rustc_span::hygiene::{ExpnKind, MacroKind};
 use rustc_span::source_map::original_sp;
 use rustc_span::symbol::{self, kw, Symbol};
@@ -230,7 +230,7 @@ pub fn match_qpath(path: &QPath<'_>, segments: &[&str]) -> bool {
 /// }
 ///
 /// if match_path(ty_path, &["rustc", "lint", "Lint"]) {
-///     // This is a `rustc::lint::Lint`.
+///     // This is a `rustc_middle::lint::Lint`.
 /// }
 /// ```
 pub fn match_path(path: &Path<'_>, segments: &[&str]) -> bool {
@@ -832,7 +832,7 @@ pub fn is_integer_literal(expr: &Expr<'_>, value: u128) -> bool {
 /// Examples of coercions can be found in the Nomicon at
 /// <https://doc.rust-lang.org/nomicon/coercions.html>.
 ///
-/// See `rustc::ty::adjustment::Adjustment` and `rustc_typeck::check::coercion` for more
+/// See `rustc_middle::ty::adjustment::Adjustment` and `rustc_typeck::check::coercion` for more
 /// information on adjustments and coercions.
 pub fn is_adjusted(cx: &LateContext<'_, '_>, e: &Expr<'_>) -> bool {
     cx.tables.adjustments().get(e.hir_id).is_some()
@@ -1224,7 +1224,7 @@ pub fn match_function_call<'a, 'tcx>(
 /// to avoid crashes on `layout_of`.
 pub fn is_normalizable<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, param_env: ty::ParamEnv<'tcx>, ty: Ty<'tcx>) -> bool {
     cx.tcx.infer_ctxt().enter(|infcx| {
-        let cause = rustc::traits::ObligationCause::dummy();
+        let cause = rustc_middle::traits::ObligationCause::dummy();
         infcx.at(&cause, param_env).normalize(&ty).is_ok()
     })
 }

clippy_lints/src/utils/ptr.rs

@@ -1,9 +1,9 @@
 use crate::utils::{get_pat_name, match_var, snippet};
-use rustc::hir::map::Map;
 use rustc_ast::ast::Name;
 use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{Body, BodyId, Expr, ExprKind, Param};
 use rustc_lint::LateContext;
+use rustc_middle::hir::map::Map;
 use rustc_span::source_map::Span;
 use std::borrow::Cow;
 

clippy_lints/src/utils/usage.rs

@@ -1,6 +1,4 @@
 use crate::utils::match_var;
-use rustc::hir::map::Map;
-use rustc::ty;
 use rustc_ast::ast;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::Res;
@@ -8,6 +6,8 @@ use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
 use rustc_hir::{Expr, HirId, Path};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::LateContext;
+use rustc_middle::hir::map::Map;
+use rustc_middle::ty;
 use rustc_span::symbol::Ident;
 use rustc_typeck::expr_use_visitor::{ConsumeMode, Delegate, ExprUseVisitor, Place, PlaceBase};
 

clippy_lints/src/vec.rs

@@ -1,10 +1,10 @@
 use crate::consts::constant;
 use crate::utils::{higher, is_copy, snippet_with_applicability, span_lint_and_sugg};
 use if_chain::if_chain;
-use rustc::ty::{self, Ty};
 use rustc_errors::Applicability;
 use rustc_hir::{BorrowKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
 

src/driver.rs

@@ -5,16 +5,16 @@
 // FIXME: switch to something more ergonomic here, once available.
 // (Currently there is no way to opt into sysroot crates without `extern crate`.)
 #[allow(unused_extern_crates)]
-extern crate rustc;
-#[allow(unused_extern_crates)]
 extern crate rustc_driver;
 #[allow(unused_extern_crates)]
 extern crate rustc_errors;
 #[allow(unused_extern_crates)]
 extern crate rustc_interface;
+#[allow(unused_extern_crates)]
+extern crate rustc_middle;
 
-use rustc::ty::TyCtxt;
 use rustc_interface::interface;
+use rustc_middle::ty::TyCtxt;
 use rustc_tools_util::VersionInfo;
 
 use lazy_static::lazy_static;

tests/ui/auxiliary/proc_macro_derive.rs

@@ -16,7 +16,7 @@ pub fn derive(_: TokenStream) -> TokenStream {
     let output = quote! {
         // Should not trigger `useless_attribute`
         #[allow(dead_code)]
-        extern crate rustc;
+        extern crate rustc_middle;
     };
     output
 }

tests/ui/default_lint.rs

@@ -2,7 +2,7 @@
 #![feature(rustc_private)]
 
 #[macro_use]
-extern crate rustc;
+extern crate rustc_middle;
 #[macro_use]
 extern crate rustc_session;
 extern crate rustc_lint;

tests/ui/lint_without_lint_pass.rs

@@ -2,7 +2,7 @@
 #![feature(rustc_private)]
 
 #[macro_use]
-extern crate rustc;
+extern crate rustc_middle;
 #[macro_use]
 extern crate rustc_session;
 extern crate rustc_lint;

tests/ui/outer_expn_data.fixed

@@ -3,9 +3,9 @@
 #![deny(clippy::internal)]
 #![feature(rustc_private)]
 
-extern crate rustc;
 extern crate rustc_hir;
 extern crate rustc_lint;
+extern crate rustc_middle;
 #[macro_use]
 extern crate rustc_session;
 use rustc_hir::Expr;

tests/ui/outer_expn_data.rs

@@ -3,9 +3,9 @@
 #![deny(clippy::internal)]
 #![feature(rustc_private)]
 
-extern crate rustc;
 extern crate rustc_hir;
 extern crate rustc_lint;
+extern crate rustc_middle;
 #[macro_use]
 extern crate rustc_session;
 use rustc_hir::Expr;

tests/ui/useless_attribute.fixed

@@ -11,7 +11,7 @@
 #[allow(unused_imports)]
 #[allow(unused_extern_crates)]
 #[macro_use]
-extern crate rustc;
+extern crate rustc_middle;
 
 #[macro_use]
 extern crate proc_macro_derive;

tests/ui/useless_attribute.rs

@@ -11,7 +11,7 @@
 #[allow(unused_imports)]
 #[allow(unused_extern_crates)]
 #[macro_use]
-extern crate rustc;
+extern crate rustc_middle;
 
 #[macro_use]
 extern crate proc_macro_derive;