Update Rust toolchain to 2023-10-09 (model-checking#2814)

Source changes required by the following upstream commits:

* rust-lang/rust@e8a2673159 Add VariantIdx back
* rust-lang/rust@f14b7c9443 Move FieldIdx and Layout to rustc_target
* rust-lang/rust@b47ad3b744 Bring back generic FieldIdx

Resolves: model-checking#2813

kani-compiler/src/codegen_cprover_gotoc/codegen/place.rs

@@ -11,14 +11,13 @@ use crate::codegen_cprover_gotoc::utils::{dynamic_fat_ptr, slice_fat_ptr};
 use crate::codegen_cprover_gotoc::GotocCtx;
 use crate::unwrap_or_return_codegen_unimplemented;
 use cbmc::goto_program::{Expr, Location, Type};
-use rustc_abi::FieldIdx;
 use rustc_hir::Mutability;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::{
     mir::{Local, Place, ProjectionElem},
     ty::{self, Ty, TypeAndMut, VariantDef},
 };
-use rustc_target::abi::{TagEncoding, VariantIdx, Variants};
+use rustc_target::abi::{FieldIdx, TagEncoding, VariantIdx, Variants};
 use tracing::{debug, trace, warn};
 
 /// A projection in Kani can either be to a type (the normal case),

kani-compiler/src/codegen_cprover_gotoc/codegen/rvalue.rs

@@ -17,13 +17,12 @@ use cbmc::goto_program::{
 use cbmc::MachineModel;
 use cbmc::{btree_string_map, InternString, InternedString};
 use num::bigint::BigInt;
-use rustc_abi::FieldIdx;
 use rustc_index::IndexVec;
 use rustc_middle::mir::{AggregateKind, BinOp, CastKind, NullOp, Operand, Place, Rvalue, UnOp};
 use rustc_middle::ty::adjustment::PointerCoercion;
 use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::{self, Instance, IntTy, Ty, TyCtxt, UintTy, VtblEntry};
-use rustc_target::abi::{FieldsShape, Size, TagEncoding, VariantIdx, Variants};
+use rustc_target::abi::{FieldIdx, FieldsShape, Size, TagEncoding, VariantIdx, Variants};
 use std::collections::BTreeMap;
 use tracing::{debug, trace, warn};
 

kani-compiler/src/codegen_cprover_gotoc/codegen/typ.rs

@@ -20,8 +20,8 @@ use rustc_middle::ty::{
 use rustc_middle::ty::{List, TypeFoldable};
 use rustc_span::def_id::DefId;
 use rustc_target::abi::{
-    Abi::Vector, FieldsShape, Integer, LayoutS, Primitive, Size, TagEncoding, TyAndLayout,
-    VariantIdx, Variants,
+    Abi::Vector, FieldIdx, FieldsShape, Integer, LayoutS, Primitive, Size, TagEncoding,
+    TyAndLayout, VariantIdx, Variants,
 };
 use rustc_target::spec::abi::Abi;
 use std::iter;
@@ -870,7 +870,7 @@ impl<'tcx> GotocCtx<'tcx> {
     fn codegen_alignment_padding(
         &self,
         size: Size,
-        layout: &LayoutS,
+        layout: &LayoutS<FieldIdx, VariantIdx>,
         idx: usize,
     ) -> Option<DatatypeComponent> {
         let align = Size::from_bits(layout.align.abi.bits());
@@ -895,7 +895,7 @@ impl<'tcx> GotocCtx<'tcx> {
     fn codegen_struct_fields(
         &mut self,
         flds: Vec<(String, Ty<'tcx>)>,
-        layout: &LayoutS,
+        layout: &LayoutS<FieldIdx, VariantIdx>,
         initial_offset: Size,
     ) -> Vec<DatatypeComponent> {
         match &layout.fields {
@@ -1352,7 +1352,7 @@ impl<'tcx> GotocCtx<'tcx> {
         &mut self,
         variant: &VariantDef,
         subst: &'tcx GenericArgsRef<'tcx>,
-        layout: &LayoutS,
+        layout: &LayoutS<FieldIdx, VariantIdx>,
         initial_offset: Size,
     ) -> Vec<DatatypeComponent> {
         let flds: Vec<_> =
@@ -1521,7 +1521,7 @@ impl<'tcx> GotocCtx<'tcx> {
         ty: Ty<'tcx>,
         adtdef: &'tcx AdtDef,
         subst: &'tcx GenericArgsRef<'tcx>,
-        variants: &IndexVec<VariantIdx, LayoutS>,
+        variants: &IndexVec<VariantIdx, LayoutS<FieldIdx, VariantIdx>>,
     ) -> Type {
         let non_zst_count = variants.iter().filter(|layout| layout.size.bytes() > 0).count();
         let mangled_name = self.ty_mangled_name(ty);
@@ -1540,7 +1540,7 @@ impl<'tcx> GotocCtx<'tcx> {
 
     pub(crate) fn variant_min_offset(
         &self,
-        variants: &IndexVec<VariantIdx, LayoutS>,
+        variants: &IndexVec<VariantIdx, LayoutS<FieldIdx, VariantIdx>>,
     ) -> Option<Size> {
         variants
             .iter()
@@ -1625,7 +1625,7 @@ impl<'tcx> GotocCtx<'tcx> {
         pretty_name: InternedString,
         def: &'tcx AdtDef,
         subst: &'tcx GenericArgsRef<'tcx>,
-        layouts: &IndexVec<VariantIdx, LayoutS>,
+        layouts: &IndexVec<VariantIdx, LayoutS<FieldIdx, VariantIdx>>,
         initial_offset: Size,
     ) -> Vec<DatatypeComponent> {
         def.variants()
@@ -1657,7 +1657,7 @@ impl<'tcx> GotocCtx<'tcx> {
         pretty_name: InternedString,
         case: &VariantDef,
         subst: &'tcx GenericArgsRef<'tcx>,
-        variant: &LayoutS,
+        variant: &LayoutS<FieldIdx, VariantIdx>,
         initial_offset: Size,
     ) -> Type {
         let case_name = format!("{name}::{}", case.name);

rust-toolchain.toml

@@ -2,5 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0 OR MIT
 
 [toolchain]
-channel = "nightly-2023-10-06"
+channel = "nightly-2023-10-09"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src", "rustfmt"]