raw pointers are not references

Author: RalfJung

compiler/rustc_const_eval/messages.ftl

@@ -337,7 +337,7 @@ const_eval_too_many_caller_args =
 
 const_eval_transient_mut_borrow = mutable references are not allowed in {const_eval_const_context}s
 
-const_eval_transient_mut_borrow_raw = raw mutable references are not allowed in {const_eval_const_context}s
+const_eval_transient_mut_raw = raw mutable pointers are not allowed in {const_eval_const_context}s
 
 const_eval_try_block_from_output_non_const =
     `try` block cannot convert `{$ty}` to the result in {const_eval_const_context}s
@@ -351,21 +351,21 @@ const_eval_unallowed_heap_allocations =
 
 const_eval_unallowed_inline_asm =
     inline assembly is not allowed in {const_eval_const_context}s
-const_eval_unallowed_mutable_refs =
-    mutable references are not allowed in the final value of {const_eval_const_context}s
+const_eval_unallowed_mutable_raw =
+    raw mutable pointers are not allowed in the final value of {const_eval_const_context}s
     .teach_note =
+        References in statics and constants may only refer to immutable values.
+
+
         Statics are shared everywhere, and if they refer to mutable data one might violate memory
         safety since holding multiple mutable references to shared data is not allowed.
 
 
         If you really want global mutable state, try using static mut or a global UnsafeCell.
 
-const_eval_unallowed_mutable_refs_raw =
-    raw mutable references are not allowed in the final value of {const_eval_const_context}s
+const_eval_unallowed_mutable_refs =
+    mutable references are not allowed in the final value of {const_eval_const_context}s
     .teach_note =
-        References in statics and constants may only refer to immutable values.
-
-
         Statics are shared everywhere, and if they refer to mutable data one might violate memory
         safety since holding multiple mutable references to shared data is not allowed.
 

compiler/rustc_const_eval/src/errors.rs

@@ -114,8 +114,8 @@ pub(crate) struct TransientMutBorrowErr {
 }
 
 #[derive(Diagnostic)]
-#[diag(const_eval_transient_mut_borrow_raw, code = "E0658")]
-pub(crate) struct TransientMutBorrowErrRaw {
+#[diag(const_eval_transient_mut_raw, code = "E0658")]
+pub(crate) struct TransientMutRawErr {
     #[primary_span]
     pub span: Span,
     pub kind: ConstContext,
@@ -156,8 +156,8 @@ pub(crate) struct UnallowedMutableRefs {
 }
 
 #[derive(Diagnostic)]
-#[diag(const_eval_unallowed_mutable_refs_raw, code = "E0764")]
-pub(crate) struct UnallowedMutableRefsRaw {
+#[diag(const_eval_unallowed_mutable_raw, code = "E0764")]
+pub(crate) struct UnallowedMutableRaw {
     #[primary_span]
     pub span: Span,
     pub kind: ConstContext,

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -466,7 +466,7 @@ impl<'tcx> NonConstOp<'tcx> for MutBorrow {
 
     fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> DiagnosticBuilder<'tcx> {
         match self.0 {
-            hir::BorrowKind::Raw => ccx.dcx().create_err(errors::UnallowedMutableRefsRaw {
+            hir::BorrowKind::Raw => ccx.tcx.dcx().create_err(errors::UnallowedMutableRaw {
                 span,
                 kind: ccx.const_kind(),
                 teach: ccx.tcx.sess.teach(&error_code!(E0764)).then_some(()),
@@ -491,10 +491,10 @@ impl<'tcx> NonConstOp<'tcx> for TransientMutBorrow {
     fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> DiagnosticBuilder<'tcx> {
         let kind = ccx.const_kind();
         match self.0 {
-            hir::BorrowKind::Raw => ccx.tcx.sess.create_feature_err(
-                errors::TransientMutBorrowErrRaw { span, kind },
-                sym::const_mut_refs,
-            ),
+            hir::BorrowKind::Raw => ccx
+                .tcx
+                .sess
+                .create_feature_err(errors::TransientMutRawErr { span, kind }, sym::const_mut_refs),
             hir::BorrowKind::Ref => ccx.tcx.sess.create_feature_err(
                 errors::TransientMutBorrowErr { span, kind },
                 sym::const_mut_refs,

tests/ui/consts/const-address-of-mut.rs

@@ -1,14 +1,14 @@
 #![feature(raw_ref_op)]
 
-const A: () = { let mut x = 2; &raw mut x; };           //~ mutable reference
+const A: () = { let mut x = 2; &raw mut x; };           //~ mutable pointer
 
-static B: () = { let mut x = 2; &raw mut x; };          //~ mutable reference
+static B: () = { let mut x = 2; &raw mut x; };          //~ mutable pointer
 
-static mut C: () = { let mut x = 2; &raw mut x; };      //~ mutable reference
+static mut C: () = { let mut x = 2; &raw mut x; };      //~ mutable pointer
 
 const fn foo() {
     let mut x = 0;
-    let y = &raw mut x;                                 //~ mutable reference
+    let y = &raw mut x;                                 //~ mutable pointer
 }
 
 fn main() {}

tests/ui/consts/const-address-of-mut.stderr

@@ -1,4 +1,4 @@
-error[E0658]: raw mutable references are not allowed in constants
+error[E0658]: raw mutable pointers are not allowed in constants
   --> $DIR/const-address-of-mut.rs:3:32
    |
 LL | const A: () = { let mut x = 2; &raw mut x; };
@@ -8,7 +8,7 @@ LL | const A: () = { let mut x = 2; &raw mut x; };
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: raw mutable references are not allowed in statics
+error[E0658]: raw mutable pointers are not allowed in statics
   --> $DIR/const-address-of-mut.rs:5:33
    |
 LL | static B: () = { let mut x = 2; &raw mut x; };
@@ -18,7 +18,7 @@ LL | static B: () = { let mut x = 2; &raw mut x; };
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: raw mutable references are not allowed in statics
+error[E0658]: raw mutable pointers are not allowed in statics
   --> $DIR/const-address-of-mut.rs:7:37
    |
 LL | static mut C: () = { let mut x = 2; &raw mut x; };
@@ -28,7 +28,7 @@ LL | static mut C: () = { let mut x = 2; &raw mut x; };
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: raw mutable references are not allowed in constant functions
+error[E0658]: raw mutable pointers are not allowed in constant functions
   --> $DIR/const-address-of-mut.rs:11:13
    |
 LL |     let y = &raw mut x;

tests/ui/consts/min_const_fn/address_of.rs

@@ -2,15 +2,15 @@
 
 const fn mutable_address_of_in_const() {
     let mut a = 0;
-    let b = &raw mut a;         //~ ERROR mutable reference
+    let b = &raw mut a;         //~ ERROR mutable pointer
 }
 
 struct X;
 
 impl X {
     const fn inherent_mutable_address_of_in_const() {
         let mut a = 0;
-        let b = &raw mut a;     //~ ERROR mutable reference
+        let b = &raw mut a;     //~ ERROR mutable pointer
     }
 }
 

tests/ui/consts/min_const_fn/address_of.stderr

@@ -1,4 +1,4 @@
-error[E0658]: raw mutable references are not allowed in constant functions
+error[E0658]: raw mutable pointers are not allowed in constant functions
   --> $DIR/address_of.rs:5:13
    |
 LL |     let b = &raw mut a;
@@ -8,7 +8,7 @@ LL |     let b = &raw mut a;
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error[E0658]: raw mutable references are not allowed in constant functions
+error[E0658]: raw mutable pointers are not allowed in constant functions
   --> $DIR/address_of.rs:13:17
    |
 LL |         let b = &raw mut a;