Update Rust toolchain to 2023-10-05 (rust-lang#2802)

Source changes required by the following upstream commits:

* rust-lang/rust@44ac8dcc71 Remove GeneratorWitness and rename
GeneratorWitnessMIR.
* rust-lang/rust@4ed4913e67 Merge ExternProviders into the general
Providers struct
* rust-lang/rust@3c52a3e280 subst -> instantiate
* rust-lang/rust@6a02baaa3d Partially outline code inside the panic!
macro
* rust-lang/rust@3148e6a993 subtyping_projections

Resolves: rust-lang#2811

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

@@ -260,7 +260,6 @@ impl<'tcx> GotocCtx<'tcx> {
                     | ty::Never
                     | ty::FnDef(..)
                     | ty::GeneratorWitness(..)
-                    | ty::GeneratorWitnessMIR(..)
                     | ty::Foreign(..)
                     | ty::Dynamic(..)
                     | ty::Bound(..)
@@ -605,13 +604,15 @@ impl<'tcx> GotocCtx<'tcx> {
                     self,
                 )
             }
-            ProjectionElem::OpaqueCast(ty) => ProjectedPlace::try_new(
-                before.goto_expr.cast_to(self.codegen_ty(ty)),
-                TypeOrVariant::Type(ty),
-                before.fat_ptr_goto_expr,
-                before.fat_ptr_mir_typ,
-                self,
-            ),
+            ProjectionElem::OpaqueCast(ty) | ProjectionElem::Subtype(ty) => {
+                ProjectedPlace::try_new(
+                    before.goto_expr.cast_to(self.codegen_ty(self.monomorphize(ty))),
+                    TypeOrVariant::Type(ty),
+                    before.fat_ptr_goto_expr,
+                    before.fat_ptr_mir_typ,
+                    self,
+                )
+            }
         }
     }
 

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

@@ -424,7 +424,7 @@ impl<'tcx> GotocCtx<'tcx> {
     {
         // Instance is Some(..) only when current codegen unit is a function.
         if let Some(current_fn) = &self.current_fn {
-            current_fn.instance().subst_mir_and_normalize_erasing_regions(
+            current_fn.instance().instantiate_mir_and_normalize_erasing_regions(
                 self.tcx,
                 ty::ParamEnv::reveal_all(),
                 ty::EarlyBinder::bind(value),
@@ -813,11 +813,7 @@ impl<'tcx> GotocCtx<'tcx> {
             ty::Bound(_, _) | ty::Param(_) => unreachable!("monomorphization bug"),
 
             // type checking remnants which shouldn't be reachable
-            ty::GeneratorWitness(_)
-            | ty::GeneratorWitnessMIR(_, _)
-            | ty::Infer(_)
-            | ty::Placeholder(_)
-            | ty::Error(_) => {
+            ty::GeneratorWitness(_, _) | ty::Infer(_) | ty::Placeholder(_) | ty::Error(_) => {
                 unreachable!("remnants of type checking")
             }
         }
@@ -1254,8 +1250,7 @@ impl<'tcx> GotocCtx<'tcx> {
             // For soundness, hold off on generating them till we have test-cases.
             ty::Bound(_, _) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),
             ty::Error(_) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),
-            ty::GeneratorWitness(_) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),
-            ty::GeneratorWitnessMIR(_, _) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),
+            ty::GeneratorWitness(_, _) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),
             ty::Infer(_) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),
             ty::Param(_) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),
             ty::Placeholder(_) => todo!("{:?} {:?}", pointee_type, pointee_type.kind()),

kani-compiler/src/codegen_cprover_gotoc/compiler_interface.rs

@@ -37,8 +37,8 @@ use rustc_metadata::fs::{emit_wrapper_file, METADATA_FILENAME};
 use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::mir::mono::MonoItem;
-use rustc_middle::query::{ExternProviders, Providers};
 use rustc_middle::ty::TyCtxt;
+use rustc_middle::util::Providers;
 use rustc_session::config::{CrateType, OutputFilenames, OutputType};
 use rustc_session::cstore::MetadataLoaderDyn;
 use rustc_session::output::out_filename;
@@ -193,10 +193,6 @@ impl CodegenBackend for GotocCodegenBackend {
         provide::provide(providers, &self.queries.lock().unwrap());
     }
 
-    fn provide_extern(&self, providers: &mut ExternProviders) {
-        provide::provide_extern(providers, &self.queries.lock().unwrap());
-    }
-
     fn print_version(&self) {
         println!("Kani-goto version: {}", env!("CARGO_PKG_VERSION"));
     }

kani-compiler/src/codegen_cprover_gotoc/overrides/hooks.rs

@@ -201,7 +201,7 @@ impl<'tcx> GotocHook<'tcx> for Panic {
     fn hook_applies(&self, tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> bool {
         let def_id = instance.def.def_id();
         Some(def_id) == tcx.lang_items().panic_fn()
-            || Some(def_id) == tcx.lang_items().panic_display()
+            || tcx.has_attr(def_id, rustc_span::sym::rustc_const_panic_str)
             || Some(def_id) == tcx.lang_items().panic_fmt()
             || Some(def_id) == tcx.lang_items().begin_panic_fn()
             || matches_function(tcx, instance, "KaniPanic")

kani-compiler/src/kani_middle/provide.rs

@@ -11,35 +11,24 @@ use crate::kani_middle::stubbing;
 use crate::kani_queries::QueryDb;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_interface;
-use rustc_middle::{
-    mir::Body,
-    query::{queries, ExternProviders, Providers},
-    ty::TyCtxt,
-};
+use rustc_middle::util::Providers;
+use rustc_middle::{mir::Body, query::queries, ty::TyCtxt};
 
 /// Sets up rustc's query mechanism to apply Kani's custom queries to code from
-/// the present crate.
+/// a crate.
 pub fn provide(providers: &mut Providers, queries: &QueryDb) {
     let args = queries.args();
     if should_override(args) {
         // Don't override queries if we are only compiling our dependencies.
         providers.optimized_mir = run_mir_passes;
+        providers.extern_queries.optimized_mir = run_mir_passes_extern;
         if args.stubbing_enabled {
             // TODO: Check if there's at least one stub being applied.
             providers.collect_and_partition_mono_items = collect_and_partition_mono_items;
         }
     }
 }
 
-/// Sets up rustc's query mechanism to apply Kani's custom queries to code from
-/// external crates.
-pub fn provide_extern(providers: &mut ExternProviders, queries: &QueryDb) {
-    if should_override(queries.args()) {
-        // Don't override queries if we are only compiling our dependencies.
-        providers.optimized_mir = run_mir_passes_extern;
-    }
-}
-
 fn should_override(args: &Arguments) -> bool {
     args.reachability_analysis != ReachabilityType::None && !args.build_std
 }
@@ -48,7 +37,7 @@ fn should_override(args: &Arguments) -> bool {
 /// running rustc's optimization passes followed by Kani-specific passes.
 fn run_mir_passes_extern(tcx: TyCtxt, def_id: DefId) -> &Body {
     tracing::debug!(?def_id, "run_mir_passes_extern");
-    let body = (rustc_interface::DEFAULT_EXTERN_QUERY_PROVIDERS.optimized_mir)(tcx, def_id);
+    let body = (rustc_interface::DEFAULT_QUERY_PROVIDERS.extern_queries.optimized_mir)(tcx, def_id);
     run_kani_mir_passes(tcx, def_id, body)
 }
 

kani-compiler/src/kani_middle/reachability.rs

@@ -242,7 +242,7 @@ impl<'a, 'tcx> MonoItemsFnCollector<'a, 'tcx> {
         T: TypeFoldable<TyCtxt<'tcx>>,
     {
         trace!(instance=?self.instance, ?value, "monomorphize");
-        self.instance.subst_mir_and_normalize_erasing_regions(
+        self.instance.instantiate_mir_and_normalize_erasing_regions(
             self.tcx,
             ParamEnv::reveal_all(),
             EarlyBinder::bind(value),
@@ -519,7 +519,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MonoItemsFnCollector<'a, 'tcx> {
                                 // even the return type, for instance for a
                                 // trait like `FromIterator`.
                                 let generic_ty = outer_args[0].ty(self.body, tcx).peel_refs();
-                                let receiver_ty = tcx.subst_and_normalize_erasing_regions(
+                                let receiver_ty = tcx.instantiate_and_normalize_erasing_regions(
                                     substs,
                                     ParamEnv::reveal_all(),
                                     EarlyBinder::bind(generic_ty),

rust-toolchain.toml

@@ -2,5 +2,5 @@
 # SPDX-License-Identifier: Apache-2.0 OR MIT
 
 [toolchain]
-channel = "nightly-2023-09-23"
+channel = "nightly-2023-10-05"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src", "rustfmt"]

src/setup.rs

@@ -59,7 +59,7 @@ pub fn appears_incomplete() -> Option<PathBuf> {
     let kani_dir = kani_dir().expect("couldn't find kani directory");
     let kani_dir_parent = kani_dir.parent().unwrap();
 
-    for entry in std::fs::read_dir(&kani_dir_parent).ok()?.flatten() {
+    for entry in std::fs::read_dir(kani_dir_parent).ok()?.flatten() {
         if let Some(file_name) = entry.file_name().to_str() {
             if file_name.ends_with(".tar.gz") {
                 return Some(kani_dir_parent.join(file_name));