Upgrade Rust toolchain to 2025-07-21 (#4241)

Relevant upstream PR:
- rust-lang/rust#143848 (Rename `stable_mir` and
`rustc_smir`)

The update was done via
```
git grep -l 'stable_mir::' | xargs sed -i 's/stable_mir::/rustc_public::/'
git grep -l 'rustc_smir::' | xargs sed -i 's/rustc_smir::/rustc_public_bridge::/'
```
followed by manual touch-ups in `kani-compiler/src/main.rs`,
`kani-compiler/src/codegen_cprover_gotoc/codegen/function.rs`,
`tools/scanner/src/lib.rs`,  and then running `scripts/kani-fmt.sh`.

Resolves: #4229

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 and MIT licenses.

---------

Co-authored-by: Carolyn Zech <cmzech@amazon.com>

Author: tautschnig

docs/src/rustc-hacks.md

@@ -68,11 +68,11 @@ Here is an example:
 # ** At the bottom of the dependencies section: **
 # Adjust the path here to point to a local copy of the rust compiler.
 # E.g.: ~/.rustup/toolchains/<toolchain>/lib/rustlib/rustc-src/rust/compiler
-rustc_smir = { path = "<path_to_rustc>/rustc_smir", optional = true }
-stable_mir = { path = "<path_to_rustc>/stable_mir", optional = true }
+rustc_public_bridge = { path = "<path_to_rustc>/rustc_public_bridge", optional = true }
+rustc_public = { path = "<path_to_rustc>/rustc_public", optional = true }
 
 [features]
-clion = ['rustc_smir', 'stable_mir']
+clion = ['rustc_public_bridge', 'rustc_public']
 ```
 
 **Don't forget to rollback the changes before you create your PR.**

docs/src/stable-mir.md

@@ -8,7 +8,7 @@ despite them not being stable yet.
 
 ### StableMIR APIs
 
-For now, the StableMIR APIs are exposed as a crate in the compiler named `stable_mir`.
+For now, the StableMIR APIs are exposed as a crate in the compiler named `rustc_public`.
 This crate includes the definition of structures and methods to be stabilized,
 which are expected to become the stable APIs in the compiler.
 To reduce the migration burden, these APIs are somewhat close to the original compiler interfaces.
@@ -59,15 +59,15 @@ there are two helpful methods to convert StableMIR constructs to internal rustc
   - `rustc_internal::internal()`: Convert a Stable item into an internal one.
   - `rustc_internal::stable()`: Convert an internal item into a Stable one.
 
-Both of these methods are inside `rustc_smir` crate in the `rustc_internal`
+Both of these methods are inside `rustc_public_bridge` crate in the `rustc_internal`
 module inside the compiler.
 Note that there is no plan to stabilize any of these methods,
 and there's also no guarantee on its support and coverage.
 
 The conversion is not implemented for all items, and some conversions may be incomplete.
 Please proceed with caution when using these methods.
 
-Besides that, do not invoke any other `rustc_smir` methods, except for `run`.
+Besides that, do not invoke any other `rustc_public_bridge` methods, except for `run`.
 This crate's methods are not meant to be invoked externally.
 Note that, the method `run` will also eventually be replaced by a Stable driver.
 

kani-compiler/src/codegen_aeneas_llbc/compiler_interface.rs

@@ -33,12 +33,12 @@ use rustc_metadata::EncodedMetadata;
 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::ty::TyCtxt;
 use rustc_middle::util::Providers;
+use rustc_public::mir::mono::{Instance, MonoItem};
+use rustc_public::rustc_internal;
+use rustc_public::{CrateDef, DefId};
 use rustc_session::Session;
 use rustc_session::config::{CrateType, OutputFilenames, OutputType};
 use rustc_session::output::out_filename;
-use stable_mir::mir::mono::{Instance, MonoItem};
-use stable_mir::rustc_internal;
-use stable_mir::{CrateDef, DefId};
 use std::any::Any;
 use std::fs::File;
 use std::path::Path;
@@ -253,8 +253,8 @@ impl CodegenBackend for LlbcCodegenBackend {
                 ReachabilityType::PubFns => {
                     let unit = CodegenUnit::default();
                     let transformer = BodyTransformation::new(&queries, tcx, &unit);
-                    let main_instance =
-                        stable_mir::entry_fn().map(|main_fn| Instance::try_from(main_fn).unwrap());
+                    let main_instance = rustc_public::entry_fn()
+                        .map(|main_fn| Instance::try_from(main_fn).unwrap());
                     let local_reachable = filter_crate_items(tcx, |_, instance| {
                         let def_id = rustc_internal::internal(tcx, instance.def.def_id());
                         Some(instance) == main_instance || tcx.is_reachable_non_generic(def_id)

kani-compiler/src/codegen_aeneas_llbc/mir_to_ullbc/mod.rs

@@ -56,19 +56,19 @@ use charon_lib::{error_assert, error_or_panic};
 use core::panic;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_middle::ty::{TyCtxt, TypingEnv};
-use stable_mir::mir::mono::{Instance, InstanceDef};
-use stable_mir::mir::{
+use rustc_public::mir::mono::{Instance, InstanceDef};
+use rustc_public::mir::{
     AggregateKind, BasicBlock, BinOp, Body, BorrowKind, CastKind, ConstOperand, Local, Mutability,
     Operand, Place, ProjectionElem, Rvalue, Statement, StatementKind, SwitchTargets, Terminator,
     TerminatorKind, UnOp, VarDebugInfoContents,
 };
-use stable_mir::rustc_internal;
-use stable_mir::ty::{
+use rustc_public::rustc_internal;
+use rustc_public::ty::{
     AdtDef, AdtKind, Allocation, ConstantKind, FnDef, GenericArgKind, GenericArgs,
     GenericParamDefKind, IntTy, MirConst, Region, RegionKind, RigidTy, Span, TraitDecl, TraitDef,
     Ty, TyConst, TyConstKind, TyKind, UintTy,
 };
-use stable_mir::{CrateDef, CrateDefType, DefId};
+use rustc_public::{CrateDef, CrateDefType, DefId};
 use std::collections::HashMap;
 use std::iter::zip;
 use std::path::PathBuf;
@@ -157,7 +157,7 @@ impl<'a, 'tcx> Context<'a, 'tcx> {
 
     //This function extract the traitrefs and their span from a def_id
     //Those information will be added into generic args of the type or the func with the def_id
-    //Note that Generic args of Charon contains trait_refs while those of stable_mir do not
+    //Note that Generic args of Charon contains trait_refs while those of rustc_public do not
     fn get_traitrefs_and_span_from_defid(
         &mut self,
         defid: DefId,

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

@@ -22,8 +22,8 @@ use super::source_region::SourceRegion;
 use crate::codegen_cprover_gotoc::GotocCtx;
 use cbmc::InternedString;
 use cbmc::goto_program::{Expr, Location, Stmt, Type};
-use stable_mir::mir::{Place, ProjectionElem};
-use stable_mir::ty::{Span as SpanStable, Ty};
+use rustc_public::mir::{Place, ProjectionElem};
+use rustc_public::ty::{Span as SpanStable, Ty};
 use strum_macros::{AsRefStr, EnumString};
 use tracing::debug;
 

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

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0 OR MIT
 
 use crate::codegen_cprover_gotoc::GotocCtx;
-use stable_mir::mir::{BasicBlock, BasicBlockIdx, Body};
+use rustc_public::mir::{BasicBlock, BasicBlockIdx, Body};
 use std::collections::HashSet;
 use tracing::debug;
 

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

@@ -6,11 +6,11 @@ use cbmc::goto_program::FunctionContract;
 use cbmc::goto_program::{Expr, Lambda, Location, Type};
 use kani_metadata::AssignsContract;
 use rustc_hir::def_id::DefId as InternalDefId;
-use stable_mir::CrateDef;
-use stable_mir::mir::mono::{Instance, MonoItem};
-use stable_mir::mir::{Local, VarDebugInfoContents};
-use stable_mir::rustc_internal;
-use stable_mir::ty::{FnDef, RigidTy, TyKind};
+use rustc_public::CrateDef;
+use rustc_public::mir::mono::{Instance, MonoItem};
+use rustc_public::mir::{Local, VarDebugInfoContents};
+use rustc_public::rustc_internal;
+use rustc_public::ty::{FnDef, RigidTy, TyKind};
 
 impl GotocCtx<'_> {
     /// Given the `proof_for_contract` target `function_under_contract` and the reachable `items`,

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

@@ -15,11 +15,11 @@ use crate::unwrap_or_return_codegen_unimplemented_stmt;
 use cbmc::goto_program::{Expr, Location, Stmt, Symbol, Type};
 use cbmc::{InternString, InternedString};
 use lazy_static::lazy_static;
-use stable_mir::CrateDef;
-use stable_mir::abi::{CallConvention, PassMode};
-use stable_mir::mir::Place;
-use stable_mir::mir::mono::Instance;
-use stable_mir::ty::{RigidTy, TyKind};
+use rustc_public::CrateDef;
+use rustc_public::abi::{CallConvention, PassMode};
+use rustc_public::mir::Place;
+use rustc_public::mir::mono::Instance;
+use rustc_public::ty::{RigidTy, TyKind};
 use tracing::{debug, trace};
 
 lazy_static! {

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

@@ -8,10 +8,10 @@ use crate::codegen_cprover_gotoc::codegen::block::reverse_postorder;
 use cbmc::InternString;
 use cbmc::InternedString;
 use cbmc::goto_program::{Expr, Stmt, Symbol};
-use stable_mir::CrateDef;
-use stable_mir::mir::mono::Instance;
-use stable_mir::mir::{Body, Local};
-use stable_mir::ty::{RigidTy, TyKind};
+use rustc_public::CrateDef;
+use rustc_public::mir::mono::Instance;
+use rustc_public::mir::{Body, Local};
+use rustc_public::ty::{RigidTy, TyKind};
 use std::collections::BTreeMap;
 use tracing::{debug, debug_span};
 
@@ -235,17 +235,17 @@ impl GotocCtx<'_> {
     }
 }
 
-pub mod rustc_smir {
+pub mod rustc_public_bridge {
     use crate::codegen_cprover_gotoc::codegen::source_region::{SourceRegion, make_source_region};
-    use crate::stable_mir::CrateDef;
+    use crate::rustc_public::CrateDef;
     use rustc_middle::mir::coverage::BasicCoverageBlock;
     use rustc_middle::mir::coverage::MappingKind::Code;
     use rustc_middle::ty::TyCtxt;
-    use stable_mir::mir::mono::Instance;
-    use stable_mir::rustc_internal;
-    use stable_mir::{Filename, Opaque};
+    use rustc_public::mir::mono::Instance;
+    use rustc_public::rustc_internal;
+    use rustc_public::{Filename, Opaque};
 
-    type CoverageOpaque = stable_mir::Opaque;
+    type CoverageOpaque = rustc_public::Opaque;
 
     /// Retrieves the `SourceRegion` associated with the data in a
     /// `CoverageOpaque` object.

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

@@ -10,10 +10,10 @@ use crate::unwrap_or_return_codegen_unimplemented_stmt;
 use cbmc::goto_program::{BinaryOperator, BuiltinFn, Expr, Location, Stmt, Type};
 use rustc_middle::ty::TypingEnv;
 use rustc_middle::ty::layout::ValidityRequirement;
-use stable_mir::mir::mono::Instance;
-use stable_mir::mir::{BasicBlockIdx, Operand, Place};
-use stable_mir::rustc_internal;
-use stable_mir::ty::{GenericArgs, RigidTy, Span, Ty, TyKind, UintTy};
+use rustc_public::mir::mono::Instance;
+use rustc_public::mir::{BasicBlockIdx, Operand, Place};
+use rustc_public::rustc_internal;
+use rustc_public::ty::{GenericArgs, RigidTy, Span, Ty, TyKind, UintTy};
 use tracing::debug;
 
 pub struct SizeAlign {