Rollup merge of rust-lang#127679 - RalfJung:raw_ref_op, r=traviscross…

…,jieyouxu

Stabilize `raw_ref_op` (RFC 2582)

This stabilizes the syntax `&raw const $expr` and `&raw mut $expr`. It has existed unstably for ~4 years now, and has been exposed on stable via the `addr_of` and `addr_of_mut` macros since Rust 1.51 (released more than 3 years ago). I think it has become clear that these operations are here to stay. So it is about time we give them proper primitive syntax. This has two advantages over the macro:

- Being macros, `addr_of`/`addr_of_mut` could in theory do arbitrary magic with the expression on which they work. The only "magic" they actually do is using the argument as a place expression rather than as a value expression. Place expressions are already a subtle topic and poorly understood by many programmers; having this hidden behind a macro using unstable language features makes this even worse. Conversely, people do have an idea of what happens below `&`/`&mut`, so we can make the subtle topic a lot more approachable by connecting to existing intuition.
- The name `addr_of` is quite unfortunate from today's perspective, given that we have accepted provenance as a reality, which means that a pointer is *not* just an address. Strict provenance has a method, `addr`, which extracts the address of a pointer; using the term `addr` in two different ways is quite unfortunate. That's why this PR soft-deprecates `addr_of` -- we will wait a long time before actually showing any warning here, but we should start telling people that the "addr" part of this name is somewhat misleading, and `&raw` avoids that potential confusion.

In summary, this syntax improves developers' ability to conceptualize the operational semantics of Rust, while making a fundamental operation frequently used in unsafe code feel properly built in.

Possible questions to consider, based on the RFC and [this](rust-lang#64490 (comment)) great summary by `@CAD97:`

- Some questions are entirely about the semantics. The semantics are the same as with the macros so I don't think this should have any impact on this syntax PR. Still, for completeness' sake:
  - Should `&raw const *mut_ref` give a read-only pointer?
    - Tracked at: rust-lang/unsafe-code-guidelines#257
    - I think ideally the answer is "no". Stacked Borrows says that pointer is read-only, but Tree Borrows says it is mutable.
  - What exactly does `&raw const (*ptr).field` require? Answered in [the reference](https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html): the arithmetic to compute the field offset follows the rules of `ptr::offset`, making it UB if it goes out-of-bounds. Making this a safe operation (using `wrapping_offset` rules) is considered too much of a loss for alias analysis.
- Choose a different syntax? I don't want to re-litigate the RFC. The only credible alternative that has been proposed is `&raw $place` instead of `&raw const $place`, which (IIUC) could be achieved by making `raw` a contextual keyword in a new edition. The type is named `*const T`, so the explicit `const` is consistent in that regard. `&raw expr` lacks the explicit indication of immutability. However, `&raw const expr` is quite a but longer than `addr_of!(expr)`.
- Shouldn't we have a completely new, better raw pointer type instead? Yes we all want to see that happen -- but I don't think we should block stabilization on that, given that such a nicer type is not on the horizon currently and given the issues with `addr_of!` mentioned above. (If we keep the `&raw $place` syntax free for this, we could use it in the future for that new type.)
- What about the lint the RFC talked about? It hasn't been implemented yet.  Given that the problematic code is UB with or without this stabilization, I don't think the lack of the lint should block stabilization.
  - I created an issue to track adding it: rust-lang#127724
- Other points from the "future possibilites of the RFC
  - "Syntactic sugar" extension: this has not been implemented. I'd argue this is too confusing, we should stick to what the RFC suggested and if we want to do anything about such expressions, add the lint.
  - Encouraging / requiring `&raw` in situations where references are often/definitely incorrect: this has been / is being implemented. On packed fields this already is a hard error, and for `static mut` a lint suggesting raw pointers is being rolled out.
  - Lowering of casts: this has been implemented. (It's also an invisible implementation detail.)
  - `offsetof` woes: we now have native `offset_of` so this is not relevant any more.

To be done before landing:

- [x] Suppress `unused_parens` lint around `&raw {const|mut}` expressions
  - See bottom of rust-lang#127679 (comment) for rationale
  - Implementation: rust-lang#128782
- [ ] Update the Reference.
  - rust-lang/reference#1567

Fixes rust-lang#64490

cc `@rust-lang/lang` `@rust-lang/opsem`

try-job: x86_64-msvc
try-job: test-various
try-job: dist-various-1
try-job: armhf-gnu
try-job: aarch64-apple

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -539,7 +539,6 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
         }
     }
     gate_all!(gen_blocks, "gen blocks are experimental");
-    gate_all!(raw_ref_op, "raw address of syntax is experimental");
     gate_all!(const_trait_impl, "const trait impls are experimental");
     gate_all!(
         half_open_range_patterns_in_slices,

compiler/rustc_borrowck/src/def_use.rs

@@ -55,8 +55,8 @@ pub fn categorize(context: PlaceContext) -> Option<DefUse> {
         PlaceContext::NonMutatingUse(NonMutatingUseContext::PlaceMention) |
         PlaceContext::NonUse(NonUseContext::AscribeUserTy(_)) |
 
-        PlaceContext::MutatingUse(MutatingUseContext::AddressOf) |
-        PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf) |
+        PlaceContext::MutatingUse(MutatingUseContext::RawBorrow) |
+        PlaceContext::NonMutatingUse(NonMutatingUseContext::RawBorrow) |
         PlaceContext::NonMutatingUse(NonMutatingUseContext::Inspect) |
         PlaceContext::NonMutatingUse(NonMutatingUseContext::Copy) |
         PlaceContext::NonMutatingUse(NonMutatingUseContext::Move) |

compiler/rustc_borrowck/src/lib.rs

@@ -1242,7 +1242,7 @@ impl<'mir, 'tcx> MirBorrowckCtxt<'_, 'mir, '_, 'tcx> {
                 );
             }
 
-            &Rvalue::AddressOf(mutability, place) => {
+            &Rvalue::RawPtr(mutability, place) => {
                 let access_kind = match mutability {
                     Mutability::Mut => (
                         Deep,

compiler/rustc_borrowck/src/polonius/loan_invalidations.rs

@@ -269,7 +269,7 @@ impl<'cx, 'tcx> LoanInvalidationsGenerator<'cx, 'tcx> {
                 self.access_place(location, place, access_kind, LocalMutationIsAllowed::No);
             }
 
-            &Rvalue::AddressOf(mutability, place) => {
+            &Rvalue::RawPtr(mutability, place) => {
                 let access_kind = match mutability {
                     Mutability::Mut => (
                         Deep,

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -756,7 +756,7 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
             PlaceContext::MutatingUse(_) => ty::Invariant,
             PlaceContext::NonUse(StorageDead | StorageLive | VarDebugInfo) => ty::Invariant,
             PlaceContext::NonMutatingUse(
-                Inspect | Copy | Move | PlaceMention | SharedBorrow | FakeBorrow | AddressOf
+                Inspect | Copy | Move | PlaceMention | SharedBorrow | FakeBorrow | RawBorrow
                 | Projection,
             ) => ty::Covariant,
             PlaceContext::NonUse(AscribeUserTy(variance)) => variance,
@@ -2468,7 +2468,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 self.check_operand(right, location);
             }
 
-            Rvalue::AddressOf(..)
+            Rvalue::RawPtr(..)
             | Rvalue::ThreadLocalRef(..)
             | Rvalue::Len(..)
             | Rvalue::Discriminant(..)
@@ -2485,7 +2485,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
             | Rvalue::ThreadLocalRef(_)
             | Rvalue::Repeat(..)
             | Rvalue::Ref(..)
-            | Rvalue::AddressOf(..)
+            | Rvalue::RawPtr(..)
             | Rvalue::Len(..)
             | Rvalue::Cast(..)
             | Rvalue::ShallowInitBox(..)

compiler/rustc_codegen_cranelift/example/mini_core_hello_world.rs

@@ -6,8 +6,7 @@
     extern_types,
     naked_functions,
     thread_local,
-    repr_simd,
-    raw_ref_op
+    repr_simd
 )]
 #![no_core]
 #![allow(dead_code, non_camel_case_types, internal_features)]

compiler/rustc_codegen_cranelift/src/analyze.rs

@@ -25,7 +25,7 @@ pub(crate) fn analyze(fx: &FunctionCx<'_, '_, '_>) -> IndexVec<Local, SsaKind> {
         for stmt in bb.statements.iter() {
             match &stmt.kind {
                 Assign(place_and_rval) => match &place_and_rval.1 {
-                    Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
+                    Rvalue::Ref(_, _, place) | Rvalue::RawPtr(_, place) => {
                         flag_map[place.local] = SsaKind::NotSsa;
                     }
                     _ => {}

compiler/rustc_codegen_cranelift/src/base.rs

@@ -595,7 +595,7 @@ fn codegen_stmt<'tcx>(
                     let val = cplace.to_cvalue(fx);
                     lval.write_cvalue(fx, val)
                 }
-                Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
+                Rvalue::Ref(_, _, place) | Rvalue::RawPtr(_, place) => {
                     let place = codegen_place(fx, place);
                     let ref_ = place.place_ref(fx, lval.layout());
                     lval.write_cvalue(fx, ref_);

compiler/rustc_codegen_gcc/example/mini_core_hello_world.rs

@@ -2,7 +2,7 @@
 
 #![feature(
     no_core, unboxed_closures, start, lang_items, never_type, linkage,
-    extern_types, thread_local, raw_ref_op
+    extern_types, thread_local
 )]
 #![no_core]
 #![allow(dead_code, internal_features, non_camel_case_types)]

compiler/rustc_codegen_ssa/src/mir/analyze.rs

@@ -220,14 +220,14 @@ impl<'mir, 'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> Visitor<'tcx>
                 | MutatingUseContext::SetDiscriminant
                 | MutatingUseContext::AsmOutput
                 | MutatingUseContext::Borrow
-                | MutatingUseContext::AddressOf
+                | MutatingUseContext::RawBorrow
                 | MutatingUseContext::Projection,
             )
             | PlaceContext::NonMutatingUse(
                 NonMutatingUseContext::Inspect
                 | NonMutatingUseContext::SharedBorrow
                 | NonMutatingUseContext::FakeBorrow
-                | NonMutatingUseContext::AddressOf
+                | NonMutatingUseContext::RawBorrow
                 | NonMutatingUseContext::Projection,
             ) => {
                 self.locals[local] = LocalKind::Memory;

compiler/rustc_codegen_ssa/src/mir/rvalue.rs

@@ -584,7 +584,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             mir::Rvalue::CopyForDeref(place) => {
                 self.codegen_operand(bx, &mir::Operand::Copy(place))
             }
-            mir::Rvalue::AddressOf(mutability, place) => {
+            mir::Rvalue::RawPtr(mutability, place) => {
                 let mk_ptr =
                     move |tcx: TyCtxt<'tcx>, ty: Ty<'tcx>| Ty::new_ptr(tcx, ty, mutability);
                 self.codegen_place_to_pointer(bx, place, mk_ptr)
@@ -813,7 +813,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         cg_value.len(bx.cx())
     }
 
-    /// Codegen an `Rvalue::AddressOf` or `Rvalue::Ref`
+    /// Codegen an `Rvalue::RawPtr` or `Rvalue::Ref`
     fn codegen_place_to_pointer(
         &mut self,
         bx: &mut Bx,
@@ -1085,7 +1085,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
             }
             mir::Rvalue::Ref(..) |
             mir::Rvalue::CopyForDeref(..) |
-            mir::Rvalue::AddressOf(..) |
+            mir::Rvalue::RawPtr(..) |
             mir::Rvalue::Len(..) |
             mir::Rvalue::Cast(..) | // (*)
             mir::Rvalue::ShallowInitBox(..) | // (*)

compiler/rustc_const_eval/src/check_consts/check.rs

@@ -431,13 +431,13 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                     return;
                 }
             }
-            Rvalue::AddressOf(mutbl, place) => {
+            Rvalue::RawPtr(mutbl, place) => {
                 if let Some(reborrowed_place_ref) = place_as_reborrow(self.tcx, self.body, place) {
                     let ctx = match mutbl {
                         Mutability::Not => {
-                            PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf)
+                            PlaceContext::NonMutatingUse(NonMutatingUseContext::RawBorrow)
                         }
-                        Mutability::Mut => PlaceContext::MutatingUse(MutatingUseContext::AddressOf),
+                        Mutability::Mut => PlaceContext::MutatingUse(MutatingUseContext::RawBorrow),
                     };
                     self.visit_local(reborrowed_place_ref.local, ctx, location);
                     self.visit_projection(reborrowed_place_ref, ctx, location);
@@ -472,7 +472,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
             }
 
             Rvalue::Ref(_, BorrowKind::Mut { .. }, place)
-            | Rvalue::AddressOf(Mutability::Mut, place) => {
+            | Rvalue::RawPtr(Mutability::Mut, place) => {
                 // Inside mutable statics, we allow arbitrary mutable references.
                 // We've allowed `static mut FOO = &mut [elements];` for a long time (the exact
                 // reasons why are lost to history), and there is no reason to restrict that to
@@ -493,7 +493,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
             }
 
             Rvalue::Ref(_, BorrowKind::Shared | BorrowKind::Fake(_), place)
-            | Rvalue::AddressOf(Mutability::Not, place) => {
+            | Rvalue::RawPtr(Mutability::Not, place) => {
                 let borrowed_place_has_mut_interior = qualifs::in_place::<HasMutInterior, _>(
                     self.ccx,
                     &mut |local| self.qualifs.has_mut_interior(self.ccx, local, location),

compiler/rustc_const_eval/src/check_consts/qualifs.rs

@@ -291,7 +291,7 @@ where
             in_operand::<Q, _>(cx, in_local, lhs) || in_operand::<Q, _>(cx, in_local, rhs)
         }
 
-        Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
+        Rvalue::Ref(_, _, place) | Rvalue::RawPtr(_, place) => {
             // Special-case reborrows to be more like a copy of the reference.
             if let Some((place_base, ProjectionElem::Deref)) = place.as_ref().last_projection() {
                 let base_ty = place_base.ty(cx.body, cx.tcx).ty;

compiler/rustc_const_eval/src/check_consts/resolver.rs

@@ -96,7 +96,7 @@ where
     }
 
     fn address_of_allows_mutation(&self) -> bool {
-        // Exact set of permissions granted by AddressOf is undecided. Conservatively assume that
+        // Exact set of permissions granted by RawPtr is undecided. Conservatively assume that
         // it might allow mutation until resolution of #56604.
         true
     }
@@ -170,7 +170,7 @@ where
         self.super_rvalue(rvalue, location);
 
         match rvalue {
-            mir::Rvalue::AddressOf(_mt, borrowed_place) => {
+            mir::Rvalue::RawPtr(_mt, borrowed_place) => {
                 if !borrowed_place.is_indirect() && self.address_of_allows_mutation() {
                     let place_ty = borrowed_place.ty(self.ccx.body, self.ccx.tcx).ty;
                     if Q::in_any_value_of_ty(self.ccx, place_ty) {

compiler/rustc_const_eval/src/interpret/step.rs

@@ -234,7 +234,7 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                 self.write_immediate(*val, &dest)?;
             }
 
-            AddressOf(_, place) => {
+            RawPtr(_, place) => {
                 // Figure out whether this is an addr_of of an already raw place.
                 let place_base_raw = if place.is_indirect_first_projection() {
                     let ty = self.frame().body.local_decls[place.local].ty;

compiler/rustc_error_codes/src/error_codes/E0745.md

@@ -3,7 +3,6 @@ The address of temporary value was taken.
 Erroneous code example:
 
 ```compile_fail,E0745
-# #![feature(raw_ref_op)]
 fn temp_address() {
     let ptr = &raw const 2; // error!
 }
@@ -15,7 +14,6 @@ In this example, `2` is destroyed right after the assignment, which means that
 To avoid this error, first bind the temporary to a named local variable:
 
 ```
-# #![feature(raw_ref_op)]
 fn temp_address() {
     let val = 2;
     let ptr = &raw const val; // ok!

compiler/rustc_feature/src/accepted.rs

@@ -321,6 +321,8 @@ declare_features! (
     (accepted, raw_dylib, "1.71.0", Some(58713)),
     /// Allows keywords to be escaped for use as identifiers.
     (accepted, raw_identifiers, "1.30.0", Some(48589)),
+    /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
+    (accepted, raw_ref_op, "CURRENT_RUSTC_VERSION", Some(64490)),
     /// Allows relaxing the coherence rules such that
     /// `impl<T> ForeignTrait<LocalType> for ForeignType<T>` is permitted.
     (accepted, re_rebalance_coherence, "1.41.0", Some(55437)),

compiler/rustc_feature/src/unstable.rs

@@ -565,8 +565,6 @@ declare_features! (
     (unstable, precise_capturing, "1.79.0", Some(123432)),
     /// Allows macro attributes on expressions, statements and non-inline modules.
     (unstable, proc_macro_hygiene, "1.30.0", Some(54727)),
-    /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
-    (unstable, raw_ref_op, "1.41.0", Some(64490)),
     /// Makes `&` and `&mut` patterns eat only one layer of references in Rust 2024.
     (incomplete, ref_pat_eat_one_layer_2024, "1.79.0", Some(123076)),
     /// Makes `&` and `&mut` patterns eat only one layer of references in Rust 2024—structural variant

compiler/rustc_hir_typeck/src/cast.rs

@@ -967,7 +967,7 @@ impl<'a, 'tcx> CastCheck<'tcx> {
                 // need to special-case obtaining a raw pointer
                 // from a region pointer to a vector.
 
-                // Coerce to a raw pointer so that we generate AddressOf in MIR.
+                // Coerce to a raw pointer so that we generate RawPtr in MIR.
                 let array_ptr_type = Ty::new_ptr(fcx.tcx, m_expr.ty, m_expr.mutbl);
                 fcx.coerce(self.expr, self.expr_ty, array_ptr_type, AllowTwoPhase::No, None)
                     .unwrap_or_else(|_| {

compiler/rustc_middle/src/mir/pretty.rs

@@ -1038,7 +1038,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
 
             CopyForDeref(ref place) => write!(fmt, "deref_copy {place:#?}"),
 
-            AddressOf(mutability, ref place) => {
+            RawPtr(mutability, ref place) => {
                 write!(fmt, "&raw {mut_str} {place:?}", mut_str = mutability.ptr_str())
             }
 

compiler/rustc_middle/src/mir/statement.rs

@@ -423,7 +423,7 @@ impl<'tcx> Rvalue<'tcx> {
             | Rvalue::Repeat(_, _)
             | Rvalue::Ref(_, _, _)
             | Rvalue::ThreadLocalRef(_)
-            | Rvalue::AddressOf(_, _)
+            | Rvalue::RawPtr(_, _)
             | Rvalue::Len(_)
             | Rvalue::Cast(
                 CastKind::IntToInt

compiler/rustc_middle/src/mir/syntax.rs

@@ -1293,14 +1293,14 @@ pub enum Rvalue<'tcx> {
     /// nature of this operation?
     ThreadLocalRef(DefId),
 
-    /// Creates a pointer with the indicated mutability to the place.
+    /// Creates a raw pointer with the indicated mutability to the place.
     ///
-    /// This is generated by pointer casts like `&v as *const _` or raw address of expressions like
-    /// `&raw v` or `addr_of!(v)`.
+    /// This is generated by pointer casts like `&v as *const _` or raw borrow expressions like
+    /// `&raw const v`.
     ///
     /// Like with references, the semantics of this operation are heavily dependent on the aliasing
     /// model.
-    AddressOf(Mutability, Place<'tcx>),
+    RawPtr(Mutability, Place<'tcx>),
 
     /// Yields the length of the place, as a `usize`.
     ///

compiler/rustc_middle/src/mir/tcx.rs

@@ -170,7 +170,7 @@ impl<'tcx> Rvalue<'tcx> {
                 let place_ty = place.ty(local_decls, tcx).ty;
                 Ty::new_ref(tcx, reg, place_ty, bk.to_mutbl_lossy())
             }
-            Rvalue::AddressOf(mutability, ref place) => {
+            Rvalue::RawPtr(mutability, ref place) => {
                 let place_ty = place.ty(local_decls, tcx).ty;
                 Ty::new_ptr(tcx, place_ty, mutability)
             }

compiler/rustc_middle/src/mir/visit.rs

@@ -682,13 +682,13 @@ macro_rules! make_mir_visitor {
                         );
                     }
 
-                    Rvalue::AddressOf(m, path) => {
+                    Rvalue::RawPtr(m, path) => {
                         let ctx = match m {
                             Mutability::Mut => PlaceContext::MutatingUse(
-                                MutatingUseContext::AddressOf
+                                MutatingUseContext::RawBorrow
                             ),
                             Mutability::Not => PlaceContext::NonMutatingUse(
-                                NonMutatingUseContext::AddressOf
+                                NonMutatingUseContext::RawBorrow
                             ),
                         };
                         self.visit_place(path, ctx, location);
@@ -1299,8 +1299,8 @@ pub enum NonMutatingUseContext {
     /// FIXME: do we need to distinguish shallow and deep fake borrows? In fact, do we need to
     /// distinguish fake and normal deep borrows?
     FakeBorrow,
-    /// AddressOf for *const pointer.
-    AddressOf,
+    /// `&raw const`.
+    RawBorrow,
     /// PlaceMention statement.
     ///
     /// This statement is executed as a check that the `Place` is live without reading from it,
@@ -1333,8 +1333,8 @@ pub enum MutatingUseContext {
     Drop,
     /// Mutable borrow.
     Borrow,
-    /// AddressOf for *mut pointer.
-    AddressOf,
+    /// `&raw mut`.
+    RawBorrow,
     /// Used as base for another place, e.g., `x` in `x.y`. Could potentially mutate the place.
     /// For example, the projection `x.y` is marked as a mutation in these cases:
     /// ```ignore (illustrative)
@@ -1386,8 +1386,8 @@ impl PlaceContext {
     pub fn is_address_of(&self) -> bool {
         matches!(
             self,
-            PlaceContext::NonMutatingUse(NonMutatingUseContext::AddressOf)
-                | PlaceContext::MutatingUse(MutatingUseContext::AddressOf)
+            PlaceContext::NonMutatingUse(NonMutatingUseContext::RawBorrow)
+                | PlaceContext::MutatingUse(MutatingUseContext::RawBorrow)
         )
     }
 

compiler/rustc_middle/src/thir.rs

@@ -407,7 +407,7 @@ pub enum ExprKind<'tcx> {
         arg: ExprId,
     },
     /// A `&raw [const|mut] $place_expr` raw borrow resulting in type `*[const|mut] T`.
-    AddressOf {
+    RawBorrow {
         mutability: hir::Mutability,
         arg: ExprId,
     },

compiler/rustc_middle/src/thir/visit.rs

@@ -92,7 +92,7 @@ pub fn walk_expr<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
         }
         VarRef { id: _ } | UpvarRef { closure_def_id: _, var_hir_id: _ } => {}
         Borrow { arg, borrow_kind: _ } => visitor.visit_expr(&visitor.thir()[arg]),
-        AddressOf { arg, mutability: _ } => visitor.visit_expr(&visitor.thir()[arg]),
+        RawBorrow { arg, mutability: _ } => visitor.visit_expr(&visitor.thir()[arg]),
         Break { value, label: _ } => {
             if let Some(value) = value {
                 visitor.visit_expr(&visitor.thir()[value])

compiler/rustc_mir_build/src/build/custom/parse/instruction.rs

@@ -244,8 +244,8 @@ impl<'tcx, 'body> ParseCtxt<'tcx, 'body> {
             ExprKind::Borrow { borrow_kind, arg } => Ok(
                 Rvalue::Ref(self.tcx.lifetimes.re_erased, *borrow_kind, self.parse_place(*arg)?)
             ),
-            ExprKind::AddressOf { mutability, arg } => Ok(
-                Rvalue::AddressOf(*mutability, self.parse_place(*arg)?)
+            ExprKind::RawBorrow { mutability, arg } => Ok(
+                Rvalue::RawPtr(*mutability, self.parse_place(*arg)?)
             ),
             ExprKind::Binary { op, lhs, rhs } =>  Ok(
                 Rvalue::BinaryOp(*op, Box::new((self.parse_operand(*lhs)?, self.parse_operand(*rhs)?)))

compiler/rustc_mir_build/src/build/expr/as_place.rs

@@ -542,7 +542,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             | ExprKind::PointerCoercion { .. }
             | ExprKind::Repeat { .. }
             | ExprKind::Borrow { .. }
-            | ExprKind::AddressOf { .. }
+            | ExprKind::RawBorrow { .. }
             | ExprKind::Match { .. }
             | ExprKind::If { .. }
             | ExprKind::Loop { .. }