rustc_target: move `LayoutOf` to `ty::layout`.

51 files changed, 148 insertions, 170 deletions

diff --git a/compiler/rustc_codegen_cranelift/src/common.rs b/compiler/rustc_codegen_cranelift/src/common.rs
index 03f462a63b3..6ba03f0340c 100644
--- a/compiler/rustc_codegen_cranelift/src/common.rs
+++ b/compiler/rustc_codegen_cranelift/src/common.rs
@@ -257,8 +257,7 @@ pub(crate) struct FunctionCx<'m, 'clif, 'tcx: 'm> {
 }
 
 impl<'tcx> LayoutOf<'tcx> for FunctionCx<'_, '_, 'tcx> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = TyAndLayout<'tcx>;
+    type LayoutOfResult = TyAndLayout<'tcx>;
 
     fn layout_of(&self, ty: Ty<'tcx>) -> TyAndLayout<'tcx> {
         RevealAllLayoutCx(self.tcx).layout_of(ty)
@@ -365,8 +364,7 @@ impl<'tcx> FunctionCx<'_, '_, 'tcx> {
 pub(crate) struct RevealAllLayoutCx<'tcx>(pub(crate) TyCtxt<'tcx>);
 
 impl<'tcx> LayoutOf<'tcx> for RevealAllLayoutCx<'tcx> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = TyAndLayout<'tcx>;
+    type LayoutOfResult = TyAndLayout<'tcx>;
 
     fn layout_of(&self, ty: Ty<'tcx>) -> TyAndLayout<'tcx> {
         assert!(!ty.still_further_specializable());
diff --git a/compiler/rustc_codegen_cranelift/src/lib.rs b/compiler/rustc_codegen_cranelift/src/lib.rs
index 4ef53663ca0..34cd309d26f 100644
--- a/compiler/rustc_codegen_cranelift/src/lib.rs
+++ b/compiler/rustc_codegen_cranelift/src/lib.rs
@@ -79,12 +79,12 @@ mod prelude {
     pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
     pub(crate) use rustc_middle::bug;
     pub(crate) use rustc_middle::mir::{self, *};
-    pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
+    pub(crate) use rustc_middle::ty::layout::{self, LayoutOf, TyAndLayout};
     pub(crate) use rustc_middle::ty::{
         self, FloatTy, Instance, InstanceDef, IntTy, ParamEnv, Ty, TyCtxt, TypeAndMut,
         TypeFoldable, UintTy,
     };
-    pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
+    pub(crate) use rustc_target::abi::{Abi, Scalar, Size, VariantIdx};
 
     pub(crate) use rustc_data_structures::fx::FxHashMap;
 
diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs
index abf0ea8cc0a..cd55a61cbaf 100644
--- a/compiler/rustc_codegen_llvm/src/abi.rs
+++ b/compiler/rustc_codegen_llvm/src/abi.rs
@@ -11,11 +11,12 @@ use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::MemFlags;
 use rustc_middle::bug;
+use rustc_middle::ty::layout::LayoutOf;
 pub use rustc_middle::ty::layout::{FAT_PTR_ADDR, FAT_PTR_EXTRA};
 use rustc_middle::ty::Ty;
 use rustc_target::abi::call::ArgAbi;
 pub use rustc_target::abi::call::*;
-use rustc_target::abi::{self, HasDataLayout, Int, LayoutOf};
+use rustc_target::abi::{self, HasDataLayout, Int};
 pub use rustc_target::spec::abi::Abi;
 
 use libc::c_uint;
diff --git a/compiler/rustc_codegen_llvm/src/builder.rs b/compiler/rustc_codegen_llvm/src/builder.rs
index 47529f719b5..d7885e653a1 100644
--- a/compiler/rustc_codegen_llvm/src/builder.rs
+++ b/compiler/rustc_codegen_llvm/src/builder.rs
@@ -15,7 +15,7 @@ use rustc_codegen_ssa::traits::*;
 use rustc_codegen_ssa::MemFlags;
 use rustc_data_structures::small_c_str::SmallCStr;
 use rustc_hir::def_id::DefId;
-use rustc_middle::ty::layout::TyAndLayout;
+use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::Span;
 use rustc_target::abi::{self, Align, Size};
@@ -88,11 +88,10 @@ impl HasTargetSpec for Builder<'_, '_, 'tcx> {
     }
 }
 
-impl abi::LayoutOf<'tcx> for Builder<'_, '_, 'tcx> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = TyAndLayout<'tcx>;
+impl LayoutOf<'tcx> for Builder<'_, '_, 'tcx> {
+    type LayoutOfResult = TyAndLayout<'tcx>;
 
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.cx.layout_of(ty)
     }
 }
diff --git a/compiler/rustc_codegen_llvm/src/common.rs b/compiler/rustc_codegen_llvm/src/common.rs
index 5532f53e408..cee582aec95 100644
--- a/compiler/rustc_codegen_llvm/src/common.rs
+++ b/compiler/rustc_codegen_llvm/src/common.rs
@@ -12,9 +12,10 @@ use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::*;
 use rustc_middle::bug;
 use rustc_middle::mir::interpret::{Allocation, GlobalAlloc, Scalar};
-use rustc_middle::ty::{layout::TyAndLayout, ScalarInt};
+use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
+use rustc_middle::ty::ScalarInt;
 use rustc_span::symbol::Symbol;
-use rustc_target::abi::{self, AddressSpace, HasDataLayout, LayoutOf, Pointer, Size};
+use rustc_target::abi::{self, AddressSpace, HasDataLayout, Pointer, Size};
 
 use libc::{c_char, c_uint};
 use tracing::debug;
diff --git a/compiler/rustc_codegen_llvm/src/consts.rs b/compiler/rustc_codegen_llvm/src/consts.rs
index a4e4fc4fffb..e673b06f155 100644
--- a/compiler/rustc_codegen_llvm/src/consts.rs
+++ b/compiler/rustc_codegen_llvm/src/consts.rs
@@ -15,10 +15,11 @@ use rustc_middle::mir::interpret::{
     Scalar as InterpScalar,
 };
 use rustc_middle::mir::mono::MonoItem;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, Instance, Ty};
 use rustc_middle::{bug, span_bug};
 use rustc_target::abi::{
-    AddressSpace, Align, HasDataLayout, LayoutOf, Primitive, Scalar, Size, WrappingRange,
+    AddressSpace, Align, HasDataLayout, Primitive, Scalar, Size, WrappingRange,
 };
 use std::ops::Range;
 use tracing::debug;
diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
index 45da18d4a24..1e54ad0c729 100644
--- a/compiler/rustc_codegen_llvm/src/context.rs
+++ b/compiler/rustc_codegen_llvm/src/context.rs
@@ -16,13 +16,13 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::small_c_str::SmallCStr;
 use rustc_middle::bug;
 use rustc_middle::mir::mono::CodegenUnit;
-use rustc_middle::ty::layout::{HasParamEnv, LayoutError, TyAndLayout};
+use rustc_middle::ty::layout::{HasParamEnv, LayoutError, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
 use rustc_session::config::{CFGuard, CrateType, DebugInfo};
 use rustc_session::Session;
 use rustc_span::source_map::{Span, DUMMY_SP};
 use rustc_span::symbol::Symbol;
-use rustc_target::abi::{HasDataLayout, LayoutOf, PointeeInfo, Size, TargetDataLayout, VariantIdx};
+use rustc_target::abi::{HasDataLayout, PointeeInfo, Size, TargetDataLayout, VariantIdx};
 use rustc_target::spec::{HasTargetSpec, RelocModel, Target, TlsModel};
 use smallvec::SmallVec;
 
@@ -836,14 +836,13 @@ impl ty::layout::HasTyCtxt<'tcx> for CodegenCx<'ll, 'tcx> {
 }
 
 impl LayoutOf<'tcx> for CodegenCx<'ll, 'tcx> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = TyAndLayout<'tcx>;
+    type LayoutOfResult = TyAndLayout<'tcx>;
 
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.spanned_layout_of(ty, DUMMY_SP)
     }
 
-    fn spanned_layout_of(&self, ty: Ty<'tcx>, span: Span) -> Self::TyAndLayout {
+    fn spanned_layout_of(&self, ty: Ty<'tcx>, span: Span) -> Self::LayoutOfResult {
         self.tcx.layout_of(ty::ParamEnv::reveal_all().and(ty)).unwrap_or_else(|e| {
             if let LayoutError::SizeOverflow(_) = e {
                 self.sess().span_fatal(span, &e.to_string())
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
index 8ff2f1cc652..1b7b0b88ab3 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
@@ -28,7 +28,7 @@ use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_middle::ich::NodeIdHashingMode;
 use rustc_middle::mir::{self, GeneratorLayout};
-use rustc_middle::ty::layout::{self, IntegerExt, PrimitiveExt, TyAndLayout};
+use rustc_middle::ty::layout::{self, IntegerExt, LayoutOf, PrimitiveExt, TyAndLayout};
 use rustc_middle::ty::subst::GenericArgKind;
 use rustc_middle::ty::Instance;
 use rustc_middle::ty::{self, AdtKind, GeneratorSubsts, ParamEnv, Ty, TyCtxt};
@@ -36,7 +36,7 @@ use rustc_middle::{bug, span_bug};
 use rustc_session::config::{self, DebugInfo};
 use rustc_span::symbol::{Interner, Symbol};
 use rustc_span::{self, SourceFile, SourceFileHash, Span};
-use rustc_target::abi::{Abi, Align, HasDataLayout, Integer, LayoutOf, TagEncoding};
+use rustc_target::abi::{Abi, Align, HasDataLayout, Integer, TagEncoding};
 use rustc_target::abi::{Int, Pointer, F32, F64};
 use rustc_target::abi::{Primitive, Size, VariantIdx, Variants};
 use tracing::debug;
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
index 914376d58dd..48cca704050 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
@@ -25,13 +25,13 @@ use rustc_data_structures::sync::Lrc;
 use rustc_hir::def_id::{DefId, DefIdMap};
 use rustc_index::vec::IndexVec;
 use rustc_middle::mir;
-use rustc_middle::ty::layout::HasTyCtxt;
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
 use rustc_middle::ty::subst::{GenericArgKind, SubstsRef};
 use rustc_middle::ty::{self, Instance, ParamEnv, Ty, TypeFoldable};
 use rustc_session::config::{self, DebugInfo};
 use rustc_span::symbol::Symbol;
 use rustc_span::{self, BytePos, Pos, SourceFile, SourceFileAndLine, Span};
-use rustc_target::abi::{LayoutOf, Primitive, Size};
+use rustc_target::abi::{Primitive, Size};
 
 use libc::c_uint;
 use smallvec::SmallVec;
diff --git a/compiler/rustc_codegen_llvm/src/intrinsic.rs b/compiler/rustc_codegen_llvm/src/intrinsic.rs
index e30c49295ba..1aa52d975e9 100644
--- a/compiler/rustc_codegen_llvm/src/intrinsic.rs
+++ b/compiler/rustc_codegen_llvm/src/intrinsic.rs
@@ -15,11 +15,11 @@ use rustc_codegen_ssa::mir::operand::OperandRef;
 use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::*;
 use rustc_hir as hir;
-use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt};
+use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt, LayoutOf};
 use rustc_middle::ty::{self, Ty};
 use rustc_middle::{bug, span_bug};
 use rustc_span::{sym, symbol::kw, Span, Symbol};
-use rustc_target::abi::{self, HasDataLayout, LayoutOf, Primitive};
+use rustc_target::abi::{self, HasDataLayout, Primitive};
 use rustc_target::spec::PanicStrategy;
 
 use std::cmp::Ordering;
diff --git a/compiler/rustc_codegen_llvm/src/mono_item.rs b/compiler/rustc_codegen_llvm/src/mono_item.rs
index 8a8ece640fc..8ba3e870fbb 100644
--- a/compiler/rustc_codegen_llvm/src/mono_item.rs
+++ b/compiler/rustc_codegen_llvm/src/mono_item.rs
@@ -8,10 +8,9 @@ use rustc_codegen_ssa::traits::*;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
 pub use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::mir::mono::{Linkage, Visibility};
-use rustc_middle::ty::layout::FnAbiExt;
+use rustc_middle::ty::layout::{FnAbiExt, LayoutOf};
 use rustc_middle::ty::{self, Instance, TypeFoldable};
 use rustc_session::config::CrateType;
-use rustc_target::abi::LayoutOf;
 use rustc_target::spec::RelocModel;
 use tracing::debug;
 
diff --git a/compiler/rustc_codegen_llvm/src/type_of.rs b/compiler/rustc_codegen_llvm/src/type_of.rs
index 9818905464d..d615d230ea0 100644
--- a/compiler/rustc_codegen_llvm/src/type_of.rs
+++ b/compiler/rustc_codegen_llvm/src/type_of.rs
@@ -4,12 +4,12 @@ use crate::context::TypeLowering;
 use crate::type_::Type;
 use rustc_codegen_ssa::traits::*;
 use rustc_middle::bug;
-use rustc_middle::ty::layout::{FnAbiExt, TyAndLayout};
+use rustc_middle::ty::layout::{FnAbiExt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{self, Ty, TypeFoldable};
 use rustc_target::abi::{Abi, AddressSpace, Align, FieldsShape};
 use rustc_target::abi::{Int, Pointer, F32, F64};
-use rustc_target::abi::{LayoutOf, PointeeInfo, Scalar, Size, TyAbiInterface, Variants};
+use rustc_target::abi::{PointeeInfo, Scalar, Size, TyAbiInterface, Variants};
 use smallvec::{smallvec, SmallVec};
 use tracing::debug;
 
diff --git a/compiler/rustc_codegen_llvm/src/va_arg.rs b/compiler/rustc_codegen_llvm/src/va_arg.rs
index 2208ec37a42..caafae6c267 100644
--- a/compiler/rustc_codegen_llvm/src/va_arg.rs
+++ b/compiler/rustc_codegen_llvm/src/va_arg.rs
@@ -7,9 +7,9 @@ use rustc_codegen_ssa::{
     common::IntPredicate,
     traits::{BaseTypeMethods, BuilderMethods, ConstMethods, DerivedTypeMethods},
 };
-use rustc_middle::ty::layout::HasTyCtxt;
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
 use rustc_middle::ty::Ty;
-use rustc_target::abi::{Align, Endian, HasDataLayout, LayoutOf, Size};
+use rustc_target::abi::{Align, Endian, HasDataLayout, Size};
 
 fn round_pointer_up_to_alignment(
     bx: &mut Builder<'a, 'll, 'tcx>,
diff --git a/compiler/rustc_codegen_ssa/src/base.rs b/compiler/rustc_codegen_ssa/src/base.rs
index a5143a755fe..e2c58af3e75 100644
--- a/compiler/rustc_codegen_ssa/src/base.rs
+++ b/compiler/rustc_codegen_ssa/src/base.rs
@@ -22,14 +22,14 @@ use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
 use rustc_middle::middle::cstore::EncodedMetadata;
 use rustc_middle::middle::lang_items;
 use rustc_middle::mir::mono::{CodegenUnit, CodegenUnitNameBuilder, MonoItem};
-use rustc_middle::ty::layout::{HasTyCtxt, TyAndLayout};
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
 use rustc_session::cgu_reuse_tracker::CguReuse;
 use rustc_session::config::{self, EntryFnType};
 use rustc_session::Session;
 use rustc_span::symbol::sym;
-use rustc_target::abi::{Align, LayoutOf, VariantIdx};
+use rustc_target::abi::{Align, VariantIdx};
 
 use std::convert::TryFrom;
 use std::ops::{Deref, DerefMut};
diff --git a/compiler/rustc_codegen_ssa/src/mir/analyze.rs b/compiler/rustc_codegen_ssa/src/mir/analyze.rs
index b6def164fac..8d75b2e7a3d 100644
--- a/compiler/rustc_codegen_ssa/src/mir/analyze.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/analyze.rs
@@ -9,8 +9,7 @@ use rustc_index::vec::IndexVec;
 use rustc_middle::mir::traversal;
 use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor};
 use rustc_middle::mir::{self, Location, TerminatorKind};
-use rustc_middle::ty::layout::HasTyCtxt;
-use rustc_target::abi::LayoutOf;
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
 
 pub fn non_ssa_locals<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     fx: &FunctionCx<'a, 'tcx, Bx>,
diff --git a/compiler/rustc_codegen_ssa/src/mir/block.rs b/compiler/rustc_codegen_ssa/src/mir/block.rs
index 2a76ad0fb13..2ca7e8fd7e8 100644
--- a/compiler/rustc_codegen_ssa/src/mir/block.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/block.rs
@@ -14,13 +14,13 @@ use rustc_hir::lang_items::LangItem;
 use rustc_index::vec::Idx;
 use rustc_middle::mir::AssertKind;
 use rustc_middle::mir::{self, SwitchTargets};
-use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt};
+use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt, LayoutOf};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{self, Instance, Ty, TypeFoldable};
 use rustc_span::source_map::Span;
 use rustc_span::{sym, Symbol};
 use rustc_target::abi::call::{ArgAbi, FnAbi, PassMode};
-use rustc_target::abi::{self, HasDataLayout, LayoutOf};
+use rustc_target::abi::{self, HasDataLayout};
 use rustc_target::spec::abi::Abi;
 
 /// Used by `FunctionCx::codegen_terminator` for emitting common patterns
diff --git a/compiler/rustc_codegen_ssa/src/mir/operand.rs b/compiler/rustc_codegen_ssa/src/mir/operand.rs
index cfb2befdf91..5cee25b5cca 100644
--- a/compiler/rustc_codegen_ssa/src/mir/operand.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/operand.rs
@@ -8,9 +8,9 @@ use crate::MemFlags;
 
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::{ConstValue, Pointer, Scalar};
-use rustc_middle::ty::layout::TyAndLayout;
+use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
 use rustc_middle::ty::Ty;
-use rustc_target::abi::{Abi, Align, LayoutOf, Size};
+use rustc_target::abi::{Abi, Align, Size};
 
 use std::fmt;
 
diff --git a/compiler/rustc_codegen_ssa/src/mir/place.rs b/compiler/rustc_codegen_ssa/src/mir/place.rs
index 20be46606a0..b48d6d42b43 100644
--- a/compiler/rustc_codegen_ssa/src/mir/place.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/place.rs
@@ -8,10 +8,10 @@ use crate::MemFlags;
 
 use rustc_middle::mir;
 use rustc_middle::mir::tcx::PlaceTy;
-use rustc_middle::ty::layout::{HasTyCtxt, TyAndLayout};
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, Ty};
 use rustc_target::abi::{Abi, Align, FieldsShape, Int, TagEncoding};
-use rustc_target::abi::{LayoutOf, VariantIdx, Variants};
+use rustc_target::abi::{VariantIdx, Variants};
 
 #[derive(Copy, Clone, Debug)]
 pub struct PlaceRef<'tcx, V> {
diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
index 02e2db54e74..3d8ea29160b 100644
--- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs
@@ -11,10 +11,10 @@ use rustc_apfloat::{ieee, Float, Round, Status};
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::mir;
 use rustc_middle::ty::cast::{CastTy, IntTy};
-use rustc_middle::ty::layout::HasTyCtxt;
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
 use rustc_middle::ty::{self, adjustment::PointerCast, Instance, Ty, TyCtxt};
 use rustc_span::source_map::{Span, DUMMY_SP};
-use rustc_target::abi::{Abi, Int, LayoutOf, Variants};
+use rustc_target::abi::{Abi, Int, Variants};
 
 impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
     pub fn codegen_rvalue(
diff --git a/compiler/rustc_codegen_ssa/src/mono_item.rs b/compiler/rustc_codegen_ssa/src/mono_item.rs
index 48d753e0d84..5f0f50ae2df 100644
--- a/compiler/rustc_codegen_ssa/src/mono_item.rs
+++ b/compiler/rustc_codegen_ssa/src/mono_item.rs
@@ -4,8 +4,7 @@ use crate::traits::*;
 use rustc_hir as hir;
 use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::mir::mono::{Linkage, Visibility};
-use rustc_middle::ty::layout::HasTyCtxt;
-use rustc_target::abi::LayoutOf;
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
 
 pub trait MonoItemExt<'a, 'tcx> {
     fn define<Bx: BuilderMethods<'a, 'tcx>>(&self, cx: &'a Bx::CodegenCx);
diff --git a/compiler/rustc_codegen_ssa/src/traits/backend.rs b/compiler/rustc_codegen_ssa/src/traits/backend.rs
index 1393fc71d6b..8dd4ed75e6f 100644
--- a/compiler/rustc_codegen_ssa/src/traits/backend.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/backend.rs
@@ -8,15 +8,14 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::ErrorReported;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
-use rustc_middle::ty::layout::{HasTyCtxt, TyAndLayout};
+use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::query::Providers;
-use rustc_middle::ty::{Ty, TyCtxt};
+use rustc_middle::ty::TyCtxt;
 use rustc_session::{
     config::{self, OutputFilenames, PrintRequest},
     Session,
 };
 use rustc_span::symbol::Symbol;
-use rustc_target::abi::LayoutOf;
 use rustc_target::spec::Target;
 
 pub use rustc_data_structures::sync::MetadataRef;
@@ -39,17 +38,12 @@ pub trait BackendTypes {
 }
 
 pub trait Backend<'tcx>:
-    Sized
-    + BackendTypes
-    + HasTyCtxt<'tcx>
-    + LayoutOf<'tcx, Ty = Ty<'tcx>, TyAndLayout = TyAndLayout<'tcx>>
+    Sized + BackendTypes + HasTyCtxt<'tcx> + LayoutOf<'tcx, LayoutOfResult = TyAndLayout<'tcx>>
 {
 }
 
 impl<'tcx, T> Backend<'tcx> for T where
-    Self: BackendTypes
-        + HasTyCtxt<'tcx>
-        + LayoutOf<'tcx, Ty = Ty<'tcx>, TyAndLayout = TyAndLayout<'tcx>>
+    Self: BackendTypes + HasTyCtxt<'tcx> + LayoutOf<'tcx, LayoutOfResult = TyAndLayout<'tcx>>
 {
 }
 
diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index 88b9e92119f..2850e7a6b44 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -41,16 +41,17 @@ use rustc_hir::{ForeignItemKind, GenericParamKind, PatKind};
 use rustc_hir::{HirId, Node};
 use rustc_index::vec::Idx;
 use rustc_middle::lint::LintDiagnosticBuilder;
+use rustc_middle::ty::layout::{LayoutError, LayoutOf};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::subst::{GenericArgKind, Subst};
 use rustc_middle::ty::Instance;
-use rustc_middle::ty::{self, layout::LayoutError, Ty, TyCtxt};
+use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_session::lint::{BuiltinLintDiagnostics, FutureIncompatibilityReason};
 use rustc_span::edition::Edition;
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{BytePos, InnerSpan, MultiSpan, Span};
-use rustc_target::abi::{LayoutOf, VariantIdx};
+use rustc_target::abi::VariantIdx;
 use rustc_trait_selection::traits::misc::can_type_implement_copy;
 
 use crate::nonstandard_style::{method_context, MethodLateContext};
diff --git a/compiler/rustc_lint/src/context.rs b/compiler/rustc_lint/src/context.rs
index 7dbc3d60439..a6d3bae65ec 100644
--- a/compiler/rustc_lint/src/context.rs
+++ b/compiler/rustc_lint/src/context.rs
@@ -31,7 +31,7 @@ use rustc_hir::definitions::{DefPathData, DisambiguatedDefPathData};
 use rustc_middle::lint::LintDiagnosticBuilder;
 use rustc_middle::middle::privacy::AccessLevels;
 use rustc_middle::middle::stability;
-use rustc_middle::ty::layout::{LayoutError, TyAndLayout};
+use rustc_middle::ty::layout::{LayoutError, LayoutOf, TyAndLayout};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{self, print::Printer, subst::GenericArg, Ty, TyCtxt};
 use rustc_serialize::json::Json;
@@ -41,7 +41,7 @@ use rustc_session::Session;
 use rustc_session::SessionLintStore;
 use rustc_span::lev_distance::find_best_match_for_name;
 use rustc_span::{symbol::Symbol, MultiSpan, Span, DUMMY_SP};
-use rustc_target::abi::{self, LayoutOf};
+use rustc_target::abi;
 use tracing::debug;
 
 use std::cell::Cell;
@@ -1081,10 +1081,9 @@ impl<'tcx> ty::layout::HasParamEnv<'tcx> for LateContext<'tcx> {
 }
 
 impl<'tcx> LayoutOf<'tcx> for LateContext<'tcx> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
+    type LayoutOfResult = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
 
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.tcx.layout_of(self.param_env.and(ty))
     }
 }
diff --git a/compiler/rustc_lint/src/types.rs b/compiler/rustc_lint/src/types.rs
index 5d255781639..480f7756db3 100644
--- a/compiler/rustc_lint/src/types.rs
+++ b/compiler/rustc_lint/src/types.rs
@@ -6,14 +6,14 @@ use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{is_range_literal, Expr, ExprKind, Node};
-use rustc_middle::ty::layout::{IntegerExt, SizeSkeleton};
+use rustc_middle::ty::layout::{IntegerExt, LayoutOf, SizeSkeleton};
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::{self, AdtKind, DefIdTree, Ty, TyCtxt, TypeFoldable};
 use rustc_span::source_map;
 use rustc_span::symbol::sym;
 use rustc_span::{Span, Symbol, DUMMY_SP};
 use rustc_target::abi::Abi;
-use rustc_target::abi::{Integer, LayoutOf, TagEncoding, Variants};
+use rustc_target::abi::{Integer, TagEncoding, Variants};
 use rustc_target::spec::abi::Abi as SpecAbi;
 
 use if_chain::if_chain;
diff --git a/compiler/rustc_middle/src/lib.rs b/compiler/rustc_middle/src/lib.rs
index 573fa913d68..6868be50f1d 100644
--- a/compiler/rustc_middle/src/lib.rs
+++ b/compiler/rustc_middle/src/lib.rs
@@ -31,6 +31,7 @@
 #![feature(box_patterns)]
 #![feature(core_intrinsics)]
 #![feature(discriminant_kind)]
+#![feature(exhaustive_patterns)]
 #![feature(if_let_guard)]
 #![feature(never_type)]
 #![feature(extern_types)]
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index 5e5902abe66..1259538bcfb 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -13,7 +13,7 @@ use rustc_index::bit_set::BitSet;
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_session::{config::OptLevel, DataTypeKind, FieldInfo, SizeKind, VariantInfo};
 use rustc_span::symbol::{Ident, Symbol};
-use rustc_span::DUMMY_SP;
+use rustc_span::{Span, DUMMY_SP};
 use rustc_target::abi::call::{
     ArgAbi, ArgAttribute, ArgAttributes, ArgExtension, Conv, FnAbi, PassMode, Reg, RegKind,
 };
@@ -2062,28 +2062,67 @@ impl<'tcx, T: HasTyCtxt<'tcx>> HasTyCtxt<'tcx> for LayoutCx<'tcx, T> {
     }
 }
 
+pub trait MaybeResult<T> {
+    type Error;
+
+    fn from(x: Result<T, Self::Error>) -> Self;
+    fn to_result(self) -> Result<T, Self::Error>;
+}
+
+impl<T> MaybeResult<T> for T {
+    type Error = !;
+
+    fn from(Ok(x): Result<T, Self::Error>) -> Self {
+        x
+    }
+    fn to_result(self) -> Result<T, Self::Error> {
+        Ok(self)
+    }
+}
+
+impl<T, E> MaybeResult<T> for Result<T, E> {
+    type Error = E;
+
+    fn from(x: Result<T, Self::Error>) -> Self {
+        x
+    }
+    fn to_result(self) -> Result<T, Self::Error> {
+        self
+    }
+}
+
 pub type TyAndLayout<'tcx> = rustc_target::abi::TyAndLayout<'tcx, Ty<'tcx>>;
 
+/// Trait for contexts that can compute layouts of types.
+pub trait LayoutOf<'tcx>: HasDataLayout + HasTyCtxt<'tcx> + HasParamEnv<'tcx> {
+    type LayoutOfResult: MaybeResult<TyAndLayout<'tcx>>;
+
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult;
+    // FIXME(eddyb) avoid passing information like this, and instead add more
+    // `TyCtxt::at`-like APIs to be able to do e.g. `cx.at(span).layout_of(ty)`.
+    fn spanned_layout_of(&self, ty: Ty<'tcx>, _span: Span) -> Self::LayoutOfResult {
+        self.layout_of(ty)
+    }
+}
+
 impl LayoutOf<'tcx> for LayoutCx<'tcx, TyCtxt<'tcx>> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
+    type LayoutOfResult = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
 
     /// Computes the layout of a type. Note that this implicitly
     /// executes in "reveal all" mode, and will normalize the input type.
     #[inline]
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.tcx.layout_of(self.param_env.and(ty))
     }
 }
 
 impl LayoutOf<'tcx> for LayoutCx<'tcx, ty::query::TyCtxtAt<'tcx>> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
+    type LayoutOfResult = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
 
     /// Computes the layout of a type. Note that this implicitly
     /// executes in "reveal all" mode, and will normalize the input type.
     #[inline]
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.tcx.layout_of(self.param_env.and(ty))
     }
 }
@@ -2559,11 +2598,7 @@ impl<'tcx> ty::Instance<'tcx> {
 
 pub trait FnAbiExt<'tcx, C>
 where
-    C: LayoutOf<'tcx, Ty = Ty<'tcx>, TyAndLayout = TyAndLayout<'tcx>>
-        + HasDataLayout
-        + HasTargetSpec
-        + HasTyCtxt<'tcx>
-        + HasParamEnv<'tcx>,
+    C: LayoutOf<'tcx, LayoutOfResult = TyAndLayout<'tcx>> + HasTargetSpec,
 {
     /// Compute a `FnAbi` suitable for indirect calls, i.e. to `fn` pointers.
     ///
@@ -2746,11 +2781,7 @@ pub fn conv_from_spec_abi(tcx: TyCtxt<'_>, abi: SpecAbi) -> Conv {
 
 impl<'tcx, C> FnAbiExt<'tcx, C> for call::FnAbi<'tcx, Ty<'tcx>>
 where
-    C: LayoutOf<'tcx, Ty = Ty<'tcx>, TyAndLayout = TyAndLayout<'tcx>>
-        + HasDataLayout
-        + HasTargetSpec
-        + HasTyCtxt<'tcx>
-        + HasParamEnv<'tcx>,
+    C: LayoutOf<'tcx, LayoutOfResult = TyAndLayout<'tcx>> + HasTargetSpec,
 {
     fn of_fn_ptr(cx: &C, sig: ty::PolyFnSig<'tcx>, extra_args: &[Ty<'tcx>]) -> Self {
         call::FnAbi::new_internal(cx, sig, extra_args, None, CodegenFnAttrFlags::empty(), false)
diff --git a/compiler/rustc_mir/src/const_eval/eval_queries.rs b/compiler/rustc_mir/src/const_eval/eval_queries.rs
index dc6a6b0b9f3..3e8a93e08c2 100644
--- a/compiler/rustc_mir/src/const_eval/eval_queries.rs
+++ b/compiler/rustc_mir/src/const_eval/eval_queries.rs
@@ -12,10 +12,11 @@ use rustc_hir::def::DefKind;
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::ErrorHandled;
 use rustc_middle::traits::Reveal;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{self, subst::Subst, TyCtxt};
 use rustc_span::source_map::Span;
-use rustc_target::abi::{Abi, LayoutOf};
+use rustc_target::abi::Abi;
 use std::borrow::Cow;
 use std::convert::TryInto;
 
diff --git a/compiler/rustc_mir/src/interpret/cast.rs b/compiler/rustc_mir/src/interpret/cast.rs
index 6f18009cf47..4c4b0bd2d1f 100644
--- a/compiler/rustc_mir/src/interpret/cast.rs
+++ b/compiler/rustc_mir/src/interpret/cast.rs
@@ -5,9 +5,9 @@ use rustc_apfloat::{Float, FloatConvert};
 use rustc_middle::mir::interpret::{InterpResult, PointerArithmetic, Scalar};
 use rustc_middle::mir::CastKind;
 use rustc_middle::ty::adjustment::PointerCast;
-use rustc_middle::ty::layout::{IntegerExt, TyAndLayout};
+use rustc_middle::ty::layout::{IntegerExt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{self, FloatTy, Ty, TypeAndMut};
-use rustc_target::abi::{Integer, LayoutOf, Variants};
+use rustc_target::abi::{Integer, Variants};
 
 use super::{
     util::ensure_monomorphic_enough, FnVal, ImmTy, Immediate, InterpCx, Machine, OpTy, PlaceTy,
diff --git a/compiler/rustc_mir/src/interpret/eval_context.rs b/compiler/rustc_mir/src/interpret/eval_context.rs
index bfb3de04c59..f1f97ea0577 100644
--- a/compiler/rustc_mir/src/interpret/eval_context.rs
+++ b/compiler/rustc_mir/src/interpret/eval_context.rs
@@ -8,13 +8,13 @@ use rustc_index::vec::IndexVec;
 use rustc_macros::HashStable;
 use rustc_middle::ich::StableHashingContext;
 use rustc_middle::mir;
-use rustc_middle::ty::layout::{self, TyAndLayout};
+use rustc_middle::ty::layout::{self, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{
     self, query::TyCtxtAt, subst::SubstsRef, ParamEnv, Ty, TyCtxt, TypeFoldable,
 };
 use rustc_session::Limit;
 use rustc_span::{Pos, Span};
-use rustc_target::abi::{Align, HasDataLayout, LayoutOf, Size, TargetDataLayout};
+use rustc_target::abi::{Align, HasDataLayout, Size, TargetDataLayout};
 
 use super::{
     AllocId, GlobalId, Immediate, InterpResult, MPlaceTy, Machine, MemPlace, MemPlaceMeta, Memory,
@@ -313,11 +313,10 @@ where
 }
 
 impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> LayoutOf<'tcx> for InterpCx<'mir, 'tcx, M> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = InterpResult<'tcx, TyAndLayout<'tcx>>;
+    type LayoutOfResult = InterpResult<'tcx, TyAndLayout<'tcx>>;
 
     #[inline]
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.tcx
             .layout_of(self.param_env.and(ty))
             .map_err(|layout| err_inval!(Layout(layout)).into())
diff --git a/compiler/rustc_mir/src/interpret/intrinsics.rs b/compiler/rustc_mir/src/interpret/intrinsics.rs
index bfab886b6ee..07e974b7266 100644
--- a/compiler/rustc_mir/src/interpret/intrinsics.rs
+++ b/compiler/rustc_mir/src/interpret/intrinsics.rs
@@ -11,10 +11,11 @@ use rustc_middle::mir::{
     BinOp,
 };
 use rustc_middle::ty;
+use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::{Ty, TyCtxt};
 use rustc_span::symbol::{sym, Symbol};
-use rustc_target::abi::{Abi, Align, LayoutOf as _, Primitive, Size};
+use rustc_target::abi::{Abi, Align, Primitive, Size};
 
 use super::{
     util::ensure_monomorphic_enough, CheckInAllocMsg, ImmTy, InterpCx, Machine, OpTy, PlaceTy,
diff --git a/compiler/rustc_mir/src/interpret/intrinsics/caller_location.rs b/compiler/rustc_mir/src/interpret/intrinsics/caller_location.rs
index 022129b2a22..d4cbba18029 100644
--- a/compiler/rustc_mir/src/interpret/intrinsics/caller_location.rs
+++ b/compiler/rustc_mir/src/interpret/intrinsics/caller_location.rs
@@ -3,9 +3,9 @@ use std::convert::TryFrom;
 use rustc_ast::Mutability;
 use rustc_hir::lang_items::LangItem;
 use rustc_middle::mir::TerminatorKind;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::subst::Subst;
 use rustc_span::{Span, Symbol};
-use rustc_target::abi::LayoutOf;
 
 use crate::interpret::{
     intrinsics::{InterpCx, Machine},
diff --git a/compiler/rustc_mir/src/interpret/operand.rs b/compiler/rustc_mir/src/interpret/operand.rs
index 4afce2b6b80..e67a6690836 100644
--- a/compiler/rustc_mir/src/interpret/operand.rs
+++ b/compiler/rustc_mir/src/interpret/operand.rs
@@ -7,11 +7,11 @@ use std::fmt::Write;
 use rustc_errors::ErrorReported;
 use rustc_hir::def::Namespace;
 use rustc_macros::HashStable;
-use rustc_middle::ty::layout::{PrimitiveExt, TyAndLayout};
+use rustc_middle::ty::layout::{LayoutOf, PrimitiveExt, TyAndLayout};
 use rustc_middle::ty::print::{FmtPrinter, PrettyPrinter, Printer};
 use rustc_middle::ty::{ConstInt, Ty};
 use rustc_middle::{mir, ty};
-use rustc_target::abi::{Abi, HasDataLayout, LayoutOf, Size, TagEncoding};
+use rustc_target::abi::{Abi, HasDataLayout, Size, TagEncoding};
 use rustc_target::abi::{VariantIdx, Variants};
 
 use super::{
diff --git a/compiler/rustc_mir/src/interpret/operator.rs b/compiler/rustc_mir/src/interpret/operator.rs
index 79b493d74e1..ac000b1bb56 100644
--- a/compiler/rustc_mir/src/interpret/operator.rs
+++ b/compiler/rustc_mir/src/interpret/operator.rs
@@ -3,8 +3,8 @@ use std::convert::TryFrom;
 use rustc_apfloat::Float;
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::{InterpResult, Scalar};
-use rustc_middle::ty::{self, layout::TyAndLayout, FloatTy, Ty};
-use rustc_target::abi::LayoutOf;
+use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
+use rustc_middle::ty::{self, FloatTy, Ty};
 
 use super::{ImmTy, Immediate, InterpCx, Machine, PlaceTy};
 
diff --git a/compiler/rustc_mir/src/interpret/place.rs b/compiler/rustc_mir/src/interpret/place.rs
index afad9716b3f..95a44e3fecf 100644
--- a/compiler/rustc_mir/src/interpret/place.rs
+++ b/compiler/rustc_mir/src/interpret/place.rs
@@ -8,10 +8,10 @@ use std::hash::Hash;
 use rustc_ast::Mutability;
 use rustc_macros::HashStable;
 use rustc_middle::mir;
-use rustc_middle::ty::layout::{PrimitiveExt, TyAndLayout};
+use rustc_middle::ty::layout::{LayoutOf, PrimitiveExt, TyAndLayout};
 use rustc_middle::ty::{self, Ty};
 use rustc_target::abi::{Abi, Align, FieldsShape, TagEncoding};
-use rustc_target::abi::{HasDataLayout, LayoutOf, Size, VariantIdx, Variants};
+use rustc_target::abi::{HasDataLayout, Size, VariantIdx, Variants};
 
 use super::{
     alloc_range, mir_assign_valid_types, AllocId, AllocRef, AllocRefMut, CheckInAllocMsg,
diff --git a/compiler/rustc_mir/src/interpret/step.rs b/compiler/rustc_mir/src/interpret/step.rs
index f2a8a067dfa..1e96581c392 100644
--- a/compiler/rustc_mir/src/interpret/step.rs
+++ b/compiler/rustc_mir/src/interpret/step.rs
@@ -4,7 +4,7 @@
 
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::{InterpResult, Scalar};
-use rustc_target::abi::LayoutOf;
+use rustc_middle::ty::layout::LayoutOf;
 
 use super::{InterpCx, Machine};
 
diff --git a/compiler/rustc_mir/src/interpret/terminator.rs b/compiler/rustc_mir/src/interpret/terminator.rs
index 63496045e0d..1c8e5e9e23c 100644
--- a/compiler/rustc_mir/src/interpret/terminator.rs
+++ b/compiler/rustc_mir/src/interpret/terminator.rs
@@ -2,13 +2,13 @@ use std::borrow::Cow;
 use std::convert::TryFrom;
 
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
-use rustc_middle::ty::layout::{self, TyAndLayout};
+use rustc_middle::ty::layout::{self, LayoutOf as _, TyAndLayout};
 use rustc_middle::ty::Instance;
 use rustc_middle::{
     mir,
     ty::{self, Ty},
 };
-use rustc_target::abi::{self, LayoutOf as _};
+use rustc_target::abi;
 use rustc_target::spec::abi::Abi;
 
 use super::{
diff --git a/compiler/rustc_mir/src/interpret/validity.rs b/compiler/rustc_mir/src/interpret/validity.rs
index 2bb2f887257..03e0a8e7901 100644
--- a/compiler/rustc_mir/src/interpret/validity.rs
+++ b/compiler/rustc_mir/src/interpret/validity.rs
@@ -12,11 +12,9 @@ use rustc_data_structures::fx::FxHashSet;
 use rustc_hir as hir;
 use rustc_middle::mir::interpret::InterpError;
 use rustc_middle::ty;
-use rustc_middle::ty::layout::TyAndLayout;
+use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
 use rustc_span::symbol::{sym, Symbol};
-use rustc_target::abi::{
-    Abi, LayoutOf, Scalar as ScalarAbi, Size, VariantIdx, Variants, WrappingRange,
-};
+use rustc_target::abi::{Abi, Scalar as ScalarAbi, Size, VariantIdx, Variants, WrappingRange};
 
 use std::hash::Hash;
 
diff --git a/compiler/rustc_mir/src/transform/const_prop.rs b/compiler/rustc_mir/src/transform/const_prop.rs
index 5c51aa4ed67..a4de20ea1b4 100644
--- a/compiler/rustc_mir/src/transform/const_prop.rs
+++ b/compiler/rustc_mir/src/transform/const_prop.rs
@@ -17,14 +17,14 @@ use rustc_middle::mir::{
     Location, Operand, Place, Rvalue, SourceInfo, SourceScope, SourceScopeData, Statement,
     StatementKind, Terminator, TerminatorKind, UnOp, RETURN_PLACE,
 };
-use rustc_middle::ty::layout::{LayoutError, TyAndLayout};
+use rustc_middle::ty::layout::{LayoutError, LayoutOf, TyAndLayout};
 use rustc_middle::ty::subst::{InternalSubsts, Subst};
 use rustc_middle::ty::{
     self, ConstInt, ConstKind, Instance, ParamEnv, ScalarInt, Ty, TyCtxt, TypeFoldable,
 };
 use rustc_session::lint;
 use rustc_span::{def_id::DefId, Span};
-use rustc_target::abi::{HasDataLayout, LayoutOf, Size, TargetDataLayout};
+use rustc_target::abi::{HasDataLayout, Size, TargetDataLayout};
 use rustc_target::spec::abi::Abi;
 use rustc_trait_selection::traits;
 
@@ -331,10 +331,9 @@ struct ConstPropagator<'mir, 'tcx> {
 }
 
 impl<'mir, 'tcx> LayoutOf<'tcx> for ConstPropagator<'mir, 'tcx> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
+    type LayoutOfResult = Result<TyAndLayout<'tcx>, LayoutError<'tcx>>;
 
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.tcx.layout_of(self.param_env.and(ty))
     }
 }
diff --git a/compiler/rustc_passes/src/layout_test.rs b/compiler/rustc_passes/src/layout_test.rs
index 64ea4ee570e..bef7a3c62d5 100644
--- a/compiler/rustc_passes/src/layout_test.rs
+++ b/compiler/rustc_passes/src/layout_test.rs
@@ -3,10 +3,10 @@ use rustc_hir as hir;
 use rustc_hir::def_id::LocalDefId;
 use rustc_hir::itemlikevisit::ItemLikeVisitor;
 use rustc_hir::ItemKind;
-use rustc_middle::ty::layout::{HasParamEnv, HasTyCtxt, TyAndLayout};
+use rustc_middle::ty::layout::{HasParamEnv, HasTyCtxt, LayoutOf, TyAndLayout};
 use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
 use rustc_span::symbol::sym;
-use rustc_target::abi::{HasDataLayout, LayoutOf, TargetDataLayout};
+use rustc_target::abi::{HasDataLayout, TargetDataLayout};
 
 pub fn test_layout(tcx: TyCtxt<'_>) {
     if tcx.features().rustc_attrs {
@@ -114,10 +114,9 @@ struct UnwrapLayoutCx<'tcx> {
 }
 
 impl LayoutOf<'tcx> for UnwrapLayoutCx<'tcx> {
-    type Ty = Ty<'tcx>;
-    type TyAndLayout = TyAndLayout<'tcx>;
+    type LayoutOfResult = TyAndLayout<'tcx>;
 
-    fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout {
+    fn layout_of(&self, ty: Ty<'tcx>) -> Self::LayoutOfResult {
         self.tcx.layout_of(self.param_env.and(ty)).unwrap()
     }
 }
diff --git a/compiler/rustc_target/src/abi/mod.rs b/compiler/rustc_target/src/abi/mod.rs
index 820399943f0..b0ecd117dd2 100644
--- a/compiler/rustc_target/src/abi/mod.rs
+++ b/compiler/rustc_target/src/abi/mod.rs
@@ -13,7 +13,6 @@ use std::str::FromStr;
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_macros::HashStable_Generic;
 use rustc_serialize::json::{Json, ToJson};
-use rustc_span::Span;
 
 pub mod call;
 
@@ -1173,46 +1172,6 @@ impl<'a, Ty> Deref for TyAndLayout<'a, Ty> {
     }
 }
 
-/// Trait for context types that can compute layouts of things.
-pub trait LayoutOf<'a>: Sized {
-    type Ty: TyAbiInterface<'a, Self>;
-    type TyAndLayout: MaybeResult<TyAndLayout<'a, Self::Ty>>;
-
-    fn layout_of(&self, ty: Self::Ty) -> Self::TyAndLayout;
-    fn spanned_layout_of(&self, ty: Self::Ty, _span: Span) -> Self::TyAndLayout {
-        self.layout_of(ty)
-    }
-}
-
-pub trait MaybeResult<T> {
-    type Error;
-
-    fn from(x: Result<T, Self::Error>) -> Self;
-    fn to_result(self) -> Result<T, Self::Error>;
-}
-
-impl<T> MaybeResult<T> for T {
-    type Error = !;
-
-    fn from(Ok(x): Result<T, Self::Error>) -> Self {
-        x
-    }
-    fn to_result(self) -> Result<T, Self::Error> {
-        Ok(self)
-    }
-}
-
-impl<T, E> MaybeResult<T> for Result<T, E> {
-    type Error = E;
-
-    fn from(x: Result<T, Self::Error>) -> Self {
-        x
-    }
-    fn to_result(self) -> Result<T, Self::Error> {
-        self
-    }
-}
-
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum PointerKind {
     /// Most general case, we know no restrictions to tell LLVM.
diff --git a/src/tools/clippy/clippy_lints/src/casts/cast_ptr_alignment.rs b/src/tools/clippy/clippy_lints/src/casts/cast_ptr_alignment.rs
index 62a119d662b..5dcf1824ef0 100644
--- a/src/tools/clippy/clippy_lints/src/casts/cast_ptr_alignment.rs
+++ b/src/tools/clippy/clippy_lints/src/casts/cast_ptr_alignment.rs
@@ -3,9 +3,9 @@ use clippy_utils::is_hir_ty_cfg_dependant;
 use if_chain::if_chain;
 use rustc_hir::{Expr, ExprKind, GenericArg};
 use rustc_lint::LateContext;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, Ty};
 use rustc_span::symbol::sym;
-use rustc_target::abi::LayoutOf;
 
 use super::CAST_PTR_ALIGNMENT;
 
diff --git a/src/tools/clippy/clippy_lints/src/escape.rs b/src/tools/clippy/clippy_lints/src/escape.rs
index 685dbf26250..1ba241d3776 100644
--- a/src/tools/clippy/clippy_lints/src/escape.rs
+++ b/src/tools/clippy/clippy_lints/src/escape.rs
@@ -5,11 +5,11 @@ use rustc_hir::{self, AssocItemKind, Body, FnDecl, HirId, HirIdSet, Impl, ItemKi
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::FakeReadCause;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, TraitRef, Ty};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
 use rustc_span::symbol::kw;
-use rustc_target::abi::LayoutOf;
 use rustc_target::spec::abi::Abi;
 use rustc_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
 
@@ -171,7 +171,8 @@ impl<'a, 'tcx> Delegate<'tcx> for EscapeDelegate<'a, 'tcx> {
                 // skip if there is a `self` parameter binding to a type
                 // that contains `Self` (i.e.: `self: Box<Self>`), see #4804
                 if let Some(trait_self_ty) = self.trait_self_ty {
-                    if map.name(cmt.hir_id) == kw::SelfLower && contains_ty(self.cx.tcx, cmt.place.ty(), trait_self_ty) {
+                    if map.name(cmt.hir_id) == kw::SelfLower && contains_ty(self.cx.tcx, cmt.place.ty(), trait_self_ty)
+                    {
                         return;
                     }
                 }
diff --git a/src/tools/clippy/clippy_lints/src/invalid_upcast_comparisons.rs b/src/tools/clippy/clippy_lints/src/invalid_upcast_comparisons.rs
index 3b28b121204..b1f70b30c12 100644
--- a/src/tools/clippy/clippy_lints/src/invalid_upcast_comparisons.rs
+++ b/src/tools/clippy/clippy_lints/src/invalid_upcast_comparisons.rs
@@ -2,10 +2,10 @@ use std::cmp::Ordering;
 
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, IntTy, UintTy};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::Span;
-use rustc_target::abi::LayoutOf;
 
 use clippy_utils::comparisons::Rel;
 use clippy_utils::consts::{constant, Constant};
diff --git a/src/tools/clippy/clippy_lints/src/large_const_arrays.rs b/src/tools/clippy/clippy_lints/src/large_const_arrays.rs
index 5d4e06c2af0..10281496c11 100644
--- a/src/tools/clippy/clippy_lints/src/large_const_arrays.rs
+++ b/src/tools/clippy/clippy_lints/src/large_const_arrays.rs
@@ -1,10 +1,10 @@
-use crate::rustc_target::abi::LayoutOf;
 use clippy_utils::diagnostics::span_lint_and_then;
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::{Item, ItemKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::interpret::ConstValue;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, ConstKind};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::{BytePos, Pos, Span};
diff --git a/src/tools/clippy/clippy_lints/src/large_enum_variant.rs b/src/tools/clippy/clippy_lints/src/large_enum_variant.rs
index cde2336b690..e4b8e754628 100644
--- a/src/tools/clippy/clippy_lints/src/large_enum_variant.rs
+++ b/src/tools/clippy/clippy_lints/src/large_enum_variant.rs
@@ -6,8 +6,8 @@ use rustc_errors::Applicability;
 use rustc_hir::{Item, ItemKind, VariantData};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
-use rustc_target::abi::LayoutOf;
 
 declare_clippy_lint! {
     /// ### What it does
diff --git a/src/tools/clippy/clippy_lints/src/large_stack_arrays.rs b/src/tools/clippy/clippy_lints/src/large_stack_arrays.rs
index 7088630bfdb..bbb6c1f902c 100644
--- a/src/tools/clippy/clippy_lints/src/large_stack_arrays.rs
+++ b/src/tools/clippy/clippy_lints/src/large_stack_arrays.rs
@@ -4,11 +4,10 @@ use if_chain::if_chain;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::interpret::ConstValue;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, ConstKind};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 
-use crate::rustc_target::abi::LayoutOf;
-
 declare_clippy_lint! {
     /// ### What it does
     /// Checks for local arrays that may be too large.
diff --git a/src/tools/clippy/clippy_lints/src/methods/manual_saturating_arithmetic.rs b/src/tools/clippy/clippy_lints/src/methods/manual_saturating_arithmetic.rs
index 2fddea7068d..7ecafa1f3ba 100644
--- a/src/tools/clippy/clippy_lints/src/methods/manual_saturating_arithmetic.rs
+++ b/src/tools/clippy/clippy_lints/src/methods/manual_saturating_arithmetic.rs
@@ -6,7 +6,7 @@ use rustc_ast::ast;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
-use rustc_target::abi::LayoutOf;
+use rustc_middle::ty::layout::LayoutOf;
 
 pub fn check(
     cx: &LateContext<'_>,
diff --git a/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs b/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs
index 157b18c1f6b..6229b9608b3 100644
--- a/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs
+++ b/src/tools/clippy/clippy_lints/src/pass_by_ref_or_value.rs
@@ -13,10 +13,10 @@ use rustc_hir::intravisit::FnKind;
 use rustc_hir::{BindingAnnotation, Body, FnDecl, HirId, Impl, ItemKind, MutTy, Mutability, Node, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::def_id::LocalDefId;
 use rustc_span::{sym, Span};
-use rustc_target::abi::LayoutOf;
 use rustc_target::spec::abi::Abi;
 use rustc_target::spec::Target;
 
diff --git a/src/tools/clippy/clippy_lints/src/types/vec_box.rs b/src/tools/clippy/clippy_lints/src/types/vec_box.rs
index 7a444174626..e7e2016d8f2 100644
--- a/src/tools/clippy/clippy_lints/src/types/vec_box.rs
+++ b/src/tools/clippy/clippy_lints/src/types/vec_box.rs
@@ -5,9 +5,9 @@ use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::{self as hir, def_id::DefId, GenericArg, QPath, TyKind};
 use rustc_lint::LateContext;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::TypeFoldable;
 use rustc_span::symbol::sym;
-use rustc_target::abi::LayoutOf;
 use rustc_typeck::hir_ty_to_ty;
 
 use super::VEC_BOX;
diff --git a/src/tools/clippy/clippy_lints/src/vec.rs b/src/tools/clippy/clippy_lints/src/vec.rs
index 95a45fa937f..e76d5f81c96 100644
--- a/src/tools/clippy/clippy_lints/src/vec.rs
+++ b/src/tools/clippy/clippy_lints/src/vec.rs
@@ -1,4 +1,3 @@
-use crate::rustc_target::abi::LayoutOf;
 use clippy_utils::consts::{constant, Constant};
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::higher;
@@ -8,6 +7,7 @@ use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability};
 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;
diff --git a/src/tools/clippy/clippy_lints/src/zero_sized_map_values.rs b/src/tools/clippy/clippy_lints/src/zero_sized_map_values.rs
index 2fbe27f9479..8e1cd655b61 100644
--- a/src/tools/clippy/clippy_lints/src/zero_sized_map_values.rs
+++ b/src/tools/clippy/clippy_lints/src/zero_sized_map_values.rs
@@ -3,10 +3,10 @@ use clippy_utils::ty::{is_normalizable, is_type_diagnostic_item};
 use if_chain::if_chain;
 use rustc_hir::{self as hir, HirId, ItemKind, Node};
 use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::layout::LayoutOf as _;
 use rustc_middle::ty::{Adt, Ty, TypeFoldable};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::sym;
-use rustc_target::abi::LayoutOf as _;
 use rustc_typeck::hir_ty_to_ty;
 
 declare_clippy_lint! {