direct imports for langitem stuff

src/librustc_codegen_ssa/base.rs

@@ -31,12 +31,12 @@
 use rustc_data_structures::sync::{par_iter, Lock, ParallelIterator};
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
+use rustc_hir::lang_items::StartFnLangItem;
 use rustc_index::vec::Idx;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
 use rustc_middle::middle::cstore::EncodedMetadata;
 use rustc_middle::middle::cstore::{self, LinkagePreference};
 use rustc_middle::middle::lang_items;
-use rustc_middle::middle::lang_items::StartFnLangItem;
 use rustc_middle::mir::mono::{CodegenUnit, CodegenUnitNameBuilder, MonoItem};
 use rustc_middle::ty::layout::{self, HasTyCtxt, TyAndLayout};
 use rustc_middle::ty::layout::{FAT_PTR_ADDR, FAT_PTR_EXTRA};

src/librustc_codegen_ssa/common.rs

@@ -1,17 +1,16 @@
 #![allow(non_camel_case_types, non_snake_case)]
 
 use rustc_errors::struct_span_err;
+use rustc_hir as hir;
+use rustc_hir::def_id::DefId;
+use rustc_hir::LangItem;
 use rustc_middle::ty::{Ty, TyCtxt};
 use rustc_session::Session;
 use rustc_span::Span;
 
 use crate::base;
-use crate::traits::*;
-use rustc_hir::def_id::DefId;
-use rustc_middle::middle::lang_items::LangItem;
-
 use crate::traits::BuilderMethods;
-use rustc_hir as hir;
+use crate::traits::*;
 
 pub enum IntPredicate {
     IntEQ,

src/librustc_codegen_ssa/lib.rs

@@ -21,10 +21,10 @@
 use rustc_data_structures::svh::Svh;
 use rustc_data_structures::sync::Lrc;
 use rustc_hir::def_id::CrateNum;
+use rustc_hir::LangItem;
 use rustc_middle::dep_graph::WorkProduct;
 use rustc_middle::middle::cstore::{CrateSource, LibSource, NativeLibrary};
 use rustc_middle::middle::dependency_format::Dependencies;
-use rustc_middle::middle::lang_items::LangItem;
 use rustc_middle::ty::query::Providers;
 use rustc_session::config::{OutputFilenames, OutputType, RUST_CGU_EXT};
 use rustc_span::symbol::Symbol;

src/librustc_codegen_ssa/mir/block.rs

@@ -9,8 +9,8 @@
 use crate::traits::*;
 use crate::MemFlags;
 
+use rustc_hir::lang_items;
 use rustc_index::vec::Idx;
-use rustc_middle::middle::lang_items;
 use rustc_middle::mir;
 use rustc_middle::mir::AssertKind;
 use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt};

src/librustc_codegen_ssa/mir/rvalue.rs

@@ -8,7 +8,7 @@
 use crate::MemFlags;
 
 use rustc_apfloat::{ieee, Float, Round, Status};
-use rustc_middle::middle::lang_items::ExchangeMallocFnLangItem;
+use rustc_hir::lang_items::ExchangeMallocFnLangItem;
 use rustc_middle::mir;
 use rustc_middle::ty::cast::{CastTy, IntTy};
 use rustc_middle::ty::layout::HasTyCtxt;

src/librustc_metadata/rmeta/decoder.rs

@@ -18,13 +18,13 @@
 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, LocalDefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use rustc_hir::definitions::DefPathTable;
 use rustc_hir::definitions::{DefKey, DefPath, DefPathData, DefPathHash};
+use rustc_hir::lang_items;
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_middle::dep_graph::{self, DepNode, DepNodeExt, DepNodeIndex};
 use rustc_middle::hir::exports::Export;
 use rustc_middle::middle::cstore::{CrateSource, ExternCrate};
 use rustc_middle::middle::cstore::{ForeignModule, LinkagePreference, NativeLibrary};
 use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportLevel};
-use rustc_middle::middle::lang_items;
 use rustc_middle::mir::interpret::{AllocDecodingSession, AllocDecodingState};
 use rustc_middle::mir::{self, interpret, BodyAndCache, Promoted};
 use rustc_middle::ty::codec::TyDecoder;

src/librustc_metadata/rmeta/encoder.rs

@@ -15,6 +15,7 @@
 use rustc_hir::definitions::DefPathTable;
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
 use rustc_hir::itemlikevisit::{ItemLikeVisitor, ParItemLikeVisitor};
+use rustc_hir::lang_items;
 use rustc_hir::{AnonConst, GenericParamKind};
 use rustc_index::vec::Idx;
 use rustc_middle::hir::map::Map;
@@ -25,7 +26,6 @@
 use rustc_middle::middle::exported_symbols::{
     metadata_symbol_name, ExportedSymbol, SymbolExportLevel,
 };
-use rustc_middle::middle::lang_items;
 use rustc_middle::mir::{self, interpret};
 use rustc_middle::traits::specialization_graph;
 use rustc_middle::ty::codec::{self as ty_codec, TyEncoder};

src/librustc_metadata/rmeta/mod.rs

@@ -8,11 +8,11 @@
 use rustc_hir as hir;
 use rustc_hir::def::CtorKind;
 use rustc_hir::def_id::{DefId, DefIndex};
+use rustc_hir::lang_items;
 use rustc_index::vec::IndexVec;
 use rustc_middle::hir::exports::Export;
 use rustc_middle::middle::cstore::{DepKind, ForeignModule, LinkagePreference, NativeLibrary};
 use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportLevel};
-use rustc_middle::middle::lang_items;
 use rustc_middle::mir;
 use rustc_middle::ty::{self, ReprOptions, Ty};
 use rustc_serialize::opaque::Encoder;

src/librustc_middle/arena.rs

@@ -106,7 +106,7 @@ macro_rules! arena_types {
                 String
             >,
             [few] get_lib_features: rustc_middle::middle::lib_features::LibFeatures,
-            [few] defined_lib_features: rustc_middle::middle::lang_items::LanguageItems,
+            [few] defined_lib_features: rustc_hir::lang_items::LanguageItems,
             [few] visible_parent_map: rustc_hir::def_id::DefIdMap<rustc_hir::def_id::DefId>,
             [few] foreign_module: rustc_middle::middle::cstore::ForeignModule,
             [few] foreign_modules: Vec<rustc_middle::middle::cstore::ForeignModule>,

src/librustc_middle/middle/lang_items.rs

@@ -7,17 +7,13 @@
 //! * Traits that represent operators; e.g., `Add`, `Sub`, `Index`.
 //! * Functions called by the compiler itself.
 
-pub use self::LangItem::*;
-
 use crate::ty::{self, TyCtxt};
 
 use rustc_hir::def_id::DefId;
+use rustc_hir::LangItem;
 use rustc_span::Span;
 use rustc_target::spec::PanicStrategy;
 
-pub use rustc_hir::weak_lang_items::link_name;
-pub use rustc_hir::{LangItem, LanguageItems};
-
 impl<'tcx> TyCtxt<'tcx> {
     /// Returns the `DefId` for a given `LangItem`.
     /// If not found, fatally aborts compilation.

src/librustc_middle/ty/context.rs

@@ -11,8 +11,6 @@
 use crate::middle;
 use crate::middle::cstore::CrateStoreDyn;
 use crate::middle::cstore::EncodedMetadata;
-use crate::middle::lang_items;
-use crate::middle::lang_items::PanicLocationLangItem;
 use crate::middle::resolve_lifetime::{self, ObjectLifetimeDefault};
 use crate::middle::stability;
 use crate::mir::interpret::{Allocation, ConstValue, Scalar};
@@ -53,6 +51,8 @@
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet, LocalDefId, LOCAL_CRATE};
 use rustc_hir::definitions::{DefPathData, DefPathHash, Definitions};
+use rustc_hir::lang_items;
+use rustc_hir::lang_items::PanicLocationLangItem;
 use rustc_hir::{HirId, Node, TraitCandidate};
 use rustc_hir::{ItemKind, ItemLocalId, ItemLocalMap, ItemLocalSet};
 use rustc_index::vec::{Idx, IndexVec};
@@ -1203,7 +1203,7 @@ pub fn lib_features(self) -> &'tcx middle::lib_features::LibFeatures {
     }
 
     /// Obtain all lang items of this crate and all dependencies (recursively)
-    pub fn lang_items(self) -> &'tcx middle::lang_items::LanguageItems {
+    pub fn lang_items(self) -> &'tcx rustc_hir::lang_items::LanguageItems {
         self.get_lang_items(LOCAL_CRATE)
     }
 

src/librustc_middle/ty/instance.rs

@@ -1,10 +1,10 @@
 use crate::middle::codegen_fn_attrs::CodegenFnAttrFlags;
-use crate::middle::lang_items::DropInPlaceFnLangItem;
 use crate::ty::print::{FmtPrinter, Printer};
 use crate::ty::{self, SubstsRef, Ty, TyCtxt, TypeFoldable};
 use rustc_data_structures::AtomicRef;
 use rustc_hir::def::Namespace;
 use rustc_hir::def_id::{CrateNum, DefId};
+use rustc_hir::lang_items::DropInPlaceFnLangItem;
 use rustc_macros::HashStable;
 
 use std::fmt;

src/librustc_middle/ty/mod.rs

@@ -11,7 +11,6 @@
 use crate::ich::StableHashingContext;
 use crate::infer::canonical::Canonical;
 use crate::middle::cstore::CrateStoreDyn;
-use crate::middle::lang_items::{FnMutTraitLangItem, FnOnceTraitLangItem, FnTraitLangItem};
 use crate::middle::resolve_lifetime::ObjectLifetimeDefault;
 use crate::mir::interpret::ErrorHandled;
 use crate::mir::GeneratorLayout;
@@ -34,6 +33,7 @@
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, CtorOf, DefKind, Namespace, Res};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, CRATE_DEF_INDEX};
+use rustc_hir::lang_items::{FnMutTraitLangItem, FnOnceTraitLangItem, FnTraitLangItem};
 use rustc_hir::{Constness, GlobMap, Node, TraitMap};
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_macros::HashStable;

src/librustc_middle/ty/query/mod.rs

@@ -7,7 +7,6 @@
 use crate::middle::cstore::{CrateSource, DepKind, NativeLibraryKind};
 use crate::middle::cstore::{ExternCrate, ForeignModule, LinkagePreference, NativeLibrary};
 use crate::middle::exported_symbols::{ExportedSymbol, SymbolExportLevel};
-use crate::middle::lang_items::{LangItem, LanguageItems};
 use crate::middle::lib_features::LibFeatures;
 use crate::middle::privacy::AccessLevels;
 use crate::middle::region;
@@ -44,6 +43,7 @@
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet, LocalDefId};
+use rustc_hir::lang_items::{LangItem, LanguageItems};
 use rustc_hir::{Crate, HirIdSet, ItemLocalId, TraitCandidate};
 use rustc_index::vec::IndexVec;
 use rustc_session::config::{EntryFnType, OptLevel, OutputFilenames, SymbolManglingVersion};

src/librustc_mir/borrow_check/universal_regions.rs

@@ -17,10 +17,10 @@
 use rustc_errors::DiagnosticBuilder;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
+use rustc_hir::lang_items;
 use rustc_hir::{BodyOwnerKind, HirId};
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_infer::infer::{InferCtxt, NLLRegionVariableOrigin};
-use rustc_middle::middle::lang_items;
 use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::subst::{InternalSubsts, Subst, SubstsRef};
 use rustc_middle::ty::{self, RegionVid, Ty, TyCtxt};

src/librustc_mir/interpret/intrinsics/caller_location.rs

@@ -1,6 +1,6 @@
 use std::convert::TryFrom;
 
-use rustc_middle::middle::lang_items::PanicLocationLangItem;
+use rustc_hir::lang_items::PanicLocationLangItem;
 use rustc_middle::ty::subst::Subst;
 use rustc_span::{Span, Symbol};
 use rustc_target::abi::LayoutOf;

src/librustc_mir/monomorphize/collector.rs

@@ -181,9 +181,9 @@
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, DefIdMap, LOCAL_CRATE};
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
+use rustc_hir::lang_items::{ExchangeMallocFnLangItem, StartFnLangItem};
 use rustc_index::bit_set::GrowableBitSet;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
-use rustc_middle::middle::lang_items::{ExchangeMallocFnLangItem, StartFnLangItem};
 use rustc_middle::mir::interpret::{AllocId, ConstValue};
 use rustc_middle::mir::interpret::{ErrorHandled, GlobalAlloc, Scalar};
 use rustc_middle::mir::mono::{InstantiationMode, MonoItem};

src/librustc_mir/transform/check_consts/validation.rs

@@ -1,10 +1,10 @@
 //! The `Visitor` responsible for actually checking a `mir::Body` for invalid operations.
 
 use rustc_errors::struct_span_err;
+use rustc_hir::lang_items;
 use rustc_hir::{def_id::DefId, HirId};
 use rustc_index::bit_set::BitSet;
 use rustc_infer::infer::TyCtxtInferExt;
-use rustc_middle::middle::lang_items;
 use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor};
 use rustc_middle::mir::*;
 use rustc_middle::ty::cast::CastTy;

src/librustc_mir/util/elaborate_drops.rs

@@ -1,7 +1,7 @@
 use crate::util::patch::MirPatch;
 use rustc_hir as hir;
+use rustc_hir::lang_items;
 use rustc_index::vec::Idx;
-use rustc_middle::middle::lang_items;
 use rustc_middle::mir::*;
 use rustc_middle::traits::Reveal;
 use rustc_middle::ty::subst::SubstsRef;

src/librustc_mir_build/build/matches/test.rs

@@ -362,7 +362,7 @@ fn non_scalar_compare(
         place: Place<'tcx>,
         mut ty: Ty<'tcx>,
     ) {
-        use rustc_middle::middle::lang_items::EqTraitLangItem;
+        use rustc_hir::lang_items::EqTraitLangItem;
 
         let mut expect = self.literal_operand(source_info.span, value);
         let mut val = Operand::Copy(place);

src/librustc_mir_build/build/mod.rs

@@ -2,17 +2,17 @@
 use crate::build::scope::DropKind;
 use crate::hair::cx::Cx;
 use crate::hair::{BindingMode, LintLevel, PatKind};
-use rustc_middle::middle::lang_items;
+use rustc_attr::{self as attr, UnwindAttr};
+use rustc_hir as hir;
+use rustc_hir::def_id::DefId;
+use rustc_hir::lang_items;
+use rustc_hir::{GeneratorKind, HirIdMap, Node};
+use rustc_index::vec::{Idx, IndexVec};
+use rustc_infer::infer::TyCtxtInferExt;
 use rustc_middle::middle::region;
 use rustc_middle::mir::*;
 use rustc_middle::ty::subst::Subst;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable};
-use rustc_attr::{self as attr, UnwindAttr};
-use rustc_hir as hir;
-use rustc_hir::def_id::DefId;
-use rustc_hir::{GeneratorKind, HirIdMap, Node};
-use rustc_index::vec::{Idx, IndexVec};
-use rustc_infer::infer::TyCtxtInferExt;
 use rustc_span::symbol::kw;
 use rustc_span::Span;
 use rustc_target::spec::abi::Abi;

src/librustc_passes/weak_lang_items.rs

@@ -4,8 +4,8 @@
 use rustc_errors::struct_span_err;
 use rustc_hir as hir;
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
+use rustc_hir::lang_items;
 use rustc_hir::weak_lang_items::WEAK_ITEMS_REFS;
-use rustc_middle::middle::lang_items;
 use rustc_middle::middle::lang_items::whitelisted;
 use rustc_middle::ty::TyCtxt;
 use rustc_session::config;

src/librustc_trait_selection/infer.rs

@@ -2,11 +2,11 @@
 use crate::traits::{self, TraitEngine, TraitEngineExt};
 
 use rustc_hir as hir;
+use rustc_hir::lang_items;
 use rustc_infer::infer::outlives::env::OutlivesEnvironment;
 use rustc_infer::traits::ObligationCause;
 use rustc_middle::arena::ArenaAllocatable;
 use rustc_middle::infer::canonical::{Canonical, CanonicalizedQueryResponse, QueryResponse};
-use rustc_middle::middle::lang_items;
 use rustc_middle::traits::query::Fallible;
 use rustc_middle::ty::{self, Ty, TypeFoldable};
 use rustc_span::{Span, DUMMY_SP};

src/librustc_trait_selection/traits/select.rs

@@ -39,9 +39,9 @@
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
+use rustc_hir::lang_items;
 use rustc_index::bit_set::GrowableBitSet;
 use rustc_middle::dep_graph::{DepKind, DepNodeIndex};
-use rustc_middle::middle::lang_items;
 use rustc_middle::ty::fast_reject;
 use rustc_middle::ty::relate::TypeRelation;
 use rustc_middle::ty::subst::{Subst, SubstsRef};

src/librustc_trait_selection/traits/wf.rs

@@ -3,7 +3,7 @@
 use crate::traits::{self, AssocTypeBoundData};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
-use rustc_middle::middle::lang_items;
+use rustc_hir::lang_items;
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::{self, ToPredicate, Ty, TyCtxt, TypeFoldable, WithConstness};
 use rustc_span::symbol::{kw, Ident};

src/librustc_ty/common_traits.rs

@@ -1,7 +1,7 @@
 //! Queries for checking whether a type implements one of a few common traits.
 
+use rustc_hir::lang_items;
 use rustc_infer::infer::TyCtxtInferExt;
-use rustc_middle::middle::lang_items;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::DUMMY_SP;
 use rustc_trait_selection::traits;

src/librustc_typeck/astconv.rs

@@ -6,7 +6,6 @@
 // ignore-tidy-filelength
 
 use crate::collect::PlaceholderHirTyCollector;
-use crate::middle::lang_items::SizedTraitLangItem;
 use crate::middle::resolve_lifetime as rl;
 use crate::require_c_abi_if_c_variadic;
 use rustc_ast::ast;
@@ -18,6 +17,7 @@
 use rustc_hir::def::{CtorOf, DefKind, Namespace, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{walk_generics, Visitor as _};
+use rustc_hir::lang_items::SizedTraitLangItem;
 use rustc_hir::{Constness, GenericArg, GenericArgs};
 use rustc_middle::ty::subst::{self, InternalSubsts, Subst, SubstsRef};
 use rustc_middle::ty::{

src/librustc_typeck/check/cast.rs

@@ -35,7 +35,7 @@
 use rustc_ast::ast;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder, ErrorReported};
 use rustc_hir as hir;
-use rustc_middle::middle::lang_items;
+use rustc_hir::lang_items;
 use rustc_middle::ty::adjustment::AllowTwoPhase;
 use rustc_middle::ty::cast::{CastKind, CastTy};
 use rustc_middle::ty::error::TypeError;

src/librustc_typeck/check/closure.rs

@@ -3,9 +3,10 @@
 use super::{check_fn, Expectation, FnCtxt, GeneratorTypes};
 
 use crate::astconv::AstConv;
-use crate::middle::{lang_items, region};
+use crate::middle::region;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
+use rustc_hir::lang_items;
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use rustc_infer::infer::LateBoundRegionConversionTime;
 use rustc_infer::infer::{InferOk, InferResult};

src/librustc_typeck/check/expr.rs

@@ -24,10 +24,10 @@
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, DefKind, Res};
 use rustc_hir::def_id::DefId;
+use rustc_hir::lang_items;
 use rustc_hir::{ExprKind, QPath};
 use rustc_infer::infer;
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
-use rustc_middle::middle::lang_items;
 use rustc_middle::ty;
 use rustc_middle::ty::adjustment::{
     Adjust, Adjustment, AllowTwoPhase, AutoBorrow, AutoBorrowMutability,

src/librustc_typeck/check/method/suggest.rs

@@ -2,7 +2,6 @@
 //! found or is otherwise invalid.
 
 use crate::check::FnCtxt;
-use crate::middle::lang_items::FnOnceTraitLangItem;
 use rustc_ast::ast;
 use rustc_ast::util::lev_distance;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
@@ -11,6 +10,7 @@
 use rustc_hir::def::{DefKind, Namespace, Res};
 use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 use rustc_hir::intravisit;
+use rustc_hir::lang_items::FnOnceTraitLangItem;
 use rustc_hir::{ExprKind, Node, QPath};
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use rustc_middle::hir::map as hir_map;

src/librustc_typeck/check/mod.rs

@@ -88,7 +88,6 @@
 pub mod writeback;
 
 use crate::astconv::{AstConv, GenericArgCountMismatch, PathSeg};
-use crate::middle::lang_items;
 use rustc_ast::ast;
 use rustc_ast::util::parser::ExprPrecedence;
 use rustc_attr as attr;
@@ -101,6 +100,7 @@
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, DefIdSet, LocalDefId, LOCAL_CRATE};
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
+use rustc_hir::lang_items;
 use rustc_hir::{ExprKind, GenericArg, HirIdMap, Item, ItemKind, Node, PatKind, QPath};
 use rustc_index::vec::Idx;
 use rustc_infer::infer::canonical::{Canonical, OriginalQueryValues, QueryResponse};

src/librustc_typeck/check/wfcheck.rs

@@ -7,8 +7,8 @@
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::itemlikevisit::ParItemLikeVisitor;
+use rustc_hir::lang_items;
 use rustc_hir::ItemKind;
-use rustc_middle::middle::lang_items;
 use rustc_middle::ty::subst::{InternalSubsts, Subst};
 use rustc_middle::ty::trait_def::TraitSpecializationKind;
 use rustc_middle::ty::{

src/librustc_typeck/coherence/builtin.rs

@@ -4,11 +4,11 @@
 use rustc_errors::struct_span_err;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
+use rustc_hir::lang_items::UnsizeTraitLangItem;
 use rustc_hir::ItemKind;
 use rustc_infer::infer;
 use rustc_infer::infer::outlives::env::OutlivesEnvironment;
 use rustc_infer::infer::{RegionckMode, TyCtxtInferExt};
-use rustc_middle::middle::lang_items::UnsizeTraitLangItem;
 use rustc_middle::middle::region;
 use rustc_middle::ty::adjustment::CoerceUnsizedInfo;
 use rustc_middle::ty::TypeFoldable;

src/librustc_typeck/collect.rs

@@ -17,7 +17,6 @@
 use crate::astconv::{AstConv, Bounds, SizedByDefault};
 use crate::check::intrinsic::intrinsic_operation_unsafety;
 use crate::constrained_generic_params as cgp;
-use crate::middle::lang_items;
 use crate::middle::resolve_lifetime as rl;
 use rustc_ast::ast;
 use rustc_ast::ast::{Ident, MetaItemKind};
@@ -29,6 +28,7 @@
 use rustc_hir::def::{CtorKind, DefKind, Res};
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_hir::intravisit::{self, NestedVisitorMap, Visitor};
+use rustc_hir::weak_lang_items;
 use rustc_hir::{GenericParamKind, Node, Unsafety};
 use rustc_middle::hir::map::blocks::FnLikeNode;
 use rustc_middle::hir::map::Map;
@@ -2569,7 +2569,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, id: DefId) -> CodegenFnAttrs {
     if tcx.is_weak_lang_item(id) {
         codegen_fn_attrs.flags |= CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL;
     }
-    if let Some(name) = lang_items::link_name(&attrs) {
+    if let Some(name) = weak_lang_items::link_name(&attrs) {
         codegen_fn_attrs.export_name = Some(name);
         codegen_fn_attrs.link_name = Some(name);
     }

src/librustdoc/clean/auto_trait.rs

@@ -1,5 +1,6 @@
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir as hir;
+use rustc_hir::lang_items;
 use rustc_middle::ty::{self, Region, RegionVid, TypeFoldable};
 use rustc_trait_selection::traits::auto_trait::{self, AutoTraitResult};
 

src/librustdoc/clean/mod.rs

@@ -17,7 +17,6 @@
 use rustc_hir::def_id::{CrateNum, DefId, CRATE_DEF_INDEX};
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_infer::infer::region_constraints::{Constraint, RegionConstraintData};
-use rustc_middle::middle::lang_items;
 use rustc_middle::middle::resolve_lifetime as rl;
 use rustc_middle::middle::stability;
 use rustc_middle::ty::fold::TypeFolder;

src/librustdoc/clean/types.rs

@@ -15,9 +15,9 @@
 use rustc_hir as hir;
 use rustc_hir::def::Res;
 use rustc_hir::def_id::{CrateNum, DefId};
+use rustc_hir::lang_items;
 use rustc_hir::Mutability;
 use rustc_index::vec::IndexVec;
-use rustc_middle::middle::lang_items;
 use rustc_middle::middle::stability;
 use rustc_span::hygiene::MacroKind;
 use rustc_span::source_map::DUMMY_SP;