Auto merge of #2335 - RalfJung:rustup, r=RalfJung

rustup

rust-version

@@ -1 +1 @@
-4045ce641a9eede71cc12031a2cd71692b273890
+41ad4d9b2dbb895666337d162eda52619a6056db

src/machine.rs

@@ -541,6 +541,11 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for Evaluator<'mir, 'tcx> {
         ecx.machine.enforce_abi
     }
 
+    #[inline(always)]
+    fn check_binop_checks_overflow(ecx: &MiriEvalContext<'mir, 'tcx>) -> bool {
+        ecx.tcx.sess.overflow_checks()
+    }
+
     #[inline(always)]
     fn find_mir_or_eval_fn(
         ecx: &mut MiriEvalContext<'mir, 'tcx>,

tests/fail/backtrace/bad-backtrace-ptr.rs

@@ -4,6 +4,6 @@ extern "Rust" {
 
 fn main() {
     unsafe {
-        miri_resolve_frame(std::ptr::null_mut(), 0); //~ ERROR null pointer is not a valid pointer for this operation
+        miri_resolve_frame(std::ptr::null_mut(), 0); //~ ERROR null pointer is a dangling pointer
     }
 }

tests/fail/backtrace/bad-backtrace-ptr.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: null pointer is not a valid pointer for this operation
+error: Undefined Behavior: out-of-bounds pointer use: null pointer is a dangling pointer (it has no provenance)
   --> $DIR/bad-backtrace-ptr.rs:LL:CC
    |
 LL |         miri_resolve_frame(std::ptr::null_mut(), 0);
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ null pointer is not a valid pointer for this operation
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer use: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/dangling_pointers/deref-invalid-ptr.rs

@@ -3,5 +3,5 @@
 
 fn main() {
     let x = 16usize as *const u32;
-    let _y = unsafe { &*x as *const u32 }; //~ ERROR is not a valid pointer
+    let _y = unsafe { &*x as *const u32 }; //~ ERROR is a dangling pointer
 }

tests/fail/dangling_pointers/deref-invalid-ptr.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: 0x10 is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: 0x10[noalloc] is a dangling pointer (it has no provenance)
   --> $DIR/deref-invalid-ptr.rs:LL:CC
    |
 LL |     let _y = unsafe { &*x as *const u32 };
-   |                       ^^^ dereferencing pointer failed: 0x10 is not a valid pointer
+   |                       ^^^ dereferencing pointer failed: 0x10[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/dangling_pointers/null_pointer_deref.rs

@@ -1,5 +1,5 @@
 #[allow(deref_nullptr)]
 fn main() {
-    let x: i32 = unsafe { *std::ptr::null() }; //~ ERROR null pointer is not a valid pointer
+    let x: i32 = unsafe { *std::ptr::null() }; //~ ERROR null pointer is a dangling pointer
     panic!("this should never print: {}", x);
 }

tests/fail/dangling_pointers/null_pointer_deref.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: null pointer is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: null pointer is a dangling pointer (it has no provenance)
   --> $DIR/null_pointer_deref.rs:LL:CC
    |
 LL |     let x: i32 = unsafe { *std::ptr::null() };
-   |                           ^^^^^^^^^^^^^^^^^ dereferencing pointer failed: null pointer is not a valid pointer
+   |                           ^^^^^^^^^^^^^^^^^ dereferencing pointer failed: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/dangling_pointers/null_pointer_deref_zst.rs

@@ -3,6 +3,6 @@
 
 #[allow(deref_nullptr)]
 fn main() {
-    let x: () = unsafe { *std::ptr::null() }; //~ ERROR dereferencing pointer failed: null pointer is not a valid pointer
+    let x: () = unsafe { *std::ptr::null() }; //~ ERROR dereferencing pointer failed: null pointer is a dangling pointer
     panic!("this should never print: {:?}", x);
 }

tests/fail/dangling_pointers/null_pointer_deref_zst.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: null pointer is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: null pointer is a dangling pointer (it has no provenance)
   --> $DIR/null_pointer_deref_zst.rs:LL:CC
    |
 LL |     let x: () = unsafe { *std::ptr::null() };
-   |                          ^^^^^^^^^^^^^^^^^ dereferencing pointer failed: null pointer is not a valid pointer
+   |                          ^^^^^^^^^^^^^^^^^ dereferencing pointer failed: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/dangling_pointers/null_pointer_write.rs

@@ -1,4 +1,4 @@
 #[allow(deref_nullptr)]
 fn main() {
-    unsafe { *std::ptr::null_mut() = 0i32 }; //~ ERROR null pointer is not a valid pointer
+    unsafe { *std::ptr::null_mut() = 0i32 }; //~ ERROR null pointer is a dangling pointer
 }

tests/fail/dangling_pointers/null_pointer_write.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: null pointer is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: null pointer is a dangling pointer (it has no provenance)
   --> $DIR/null_pointer_write.rs:LL:CC
    |
 LL |     unsafe { *std::ptr::null_mut() = 0i32 };
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: null pointer is not a valid pointer
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/dangling_pointers/null_pointer_write_zst.rs

@@ -1,6 +1,6 @@
 // Some optimizations remove ZST accesses, thus masking this UB.
 // compile-flags: -Zmir-opt-level=0
-// error-pattern: memory access failed: null pointer is not a valid pointer
+// error-pattern: memory access failed: null pointer is a dangling pointer
 
 #[allow(deref_nullptr)]
 fn main() {

tests/fail/dangling_pointers/null_pointer_write_zst.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: memory access failed: null pointer is not a valid pointer
+error: Undefined Behavior: memory access failed: null pointer is a dangling pointer (it has no provenance)
   --> RUSTLIB/core/src/ptr/mod.rs:LL:CC
    |
 LL |         copy_nonoverlapping(&src as *const T, dst, 1);
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/dangling_pointers/storage_dead_dangling.rs

@@ -10,7 +10,7 @@ fn fill(v: &mut i32) {
 }
 
 fn evil() {
-    unsafe { &mut *(LEAK as *mut i32) }; //~ ERROR is not a valid pointer
+    unsafe { &mut *(LEAK as *mut i32) }; //~ ERROR is a dangling pointer
 }
 
 fn main() {

tests/fail/dangling_pointers/storage_dead_dangling.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: $HEX is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: $HEX[noalloc] is a dangling pointer (it has no provenance)
   --> $DIR/storage_dead_dangling.rs:LL:CC
    |
 LL |     unsafe { &mut *(LEAK as *mut i32) };
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: $HEX is not a valid pointer
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^ dereferencing pointer failed: $HEX[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/dangling_pointers/wild_pointer_deref.rs

@@ -2,6 +2,6 @@
 
 fn main() {
     let p = 44 as *const i32;
-    let x = unsafe { *p }; //~ ERROR is not a valid pointer
+    let x = unsafe { *p }; //~ ERROR is a dangling pointer
     panic!("this should never print: {}", x);
 }

tests/fail/dangling_pointers/wild_pointer_deref.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: 0x2c is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: 0x2c[noalloc] is a dangling pointer (it has no provenance)
   --> $DIR/wild_pointer_deref.rs:LL:CC
    |
 LL |     let x = unsafe { *p };
-   |                      ^^ dereferencing pointer failed: 0x2c is not a valid pointer
+   |                      ^^ dereferencing pointer failed: 0x2c[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/function_pointers/cast_int_to_fn_ptr.rs

@@ -4,5 +4,5 @@
 fn main() {
     let g = unsafe { std::mem::transmute::<usize, fn(i32)>(42) };
 
-    g(42) //~ ERROR not a valid pointer
+    g(42) //~ ERROR is a dangling pointer
 }

tests/fail/function_pointers/cast_int_to_fn_ptr.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: 0x2a is not a valid pointer
+error: Undefined Behavior: out-of-bounds pointer use: 0x2a[noalloc] is a dangling pointer (it has no provenance)
   --> $DIR/cast_int_to_fn_ptr.rs:LL:CC
    |
 LL |     g(42)
-   |     ^^^^^ 0x2a is not a valid pointer
+   |     ^^^^^ out-of-bounds pointer use: 0x2a[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/copy_null.rs

@@ -10,6 +10,6 @@ fn main() {
     let ptr = &mut data[0] as *mut u16;
     // Even copying 0 elements from NULL should error.
     unsafe {
-        copy_nonoverlapping(std::ptr::null(), ptr, 0); //~ ERROR: memory access failed: null pointer is not a valid pointer
+        copy_nonoverlapping(std::ptr::null(), ptr, 0); //~ ERROR: memory access failed: null pointer is a dangling pointer
     }
 }

tests/fail/intrinsics/copy_null.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: memory access failed: null pointer is not a valid pointer
+error: Undefined Behavior: memory access failed: null pointer is a dangling pointer (it has no provenance)
   --> $DIR/copy_null.rs:LL:CC
    |
 LL |         copy_nonoverlapping(std::ptr::null(), ptr, 0);
-   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/out_of_bounds_ptr_1.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: pointer arithmetic failed: ALLOC has size 4, so pointer to 5 bytes starting at offset 0 is out-of-bounds
+error: Undefined Behavior: out-of-bounds pointer arithmetic: ALLOC has size 4, so pointer to 5 bytes starting at offset 0 is out-of-bounds
   --> RUSTLIB/core/src/ptr/const_ptr.rs:LL:CC
    |
 LL |         unsafe { intrinsics::offset(self, count) }
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pointer arithmetic failed: ALLOC has size 4, so pointer to 5 bytes starting at offset 0 is out-of-bounds
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer arithmetic: ALLOC has size 4, so pointer to 5 bytes starting at offset 0 is out-of-bounds
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/out_of_bounds_ptr_3.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: pointer arithmetic failed: ALLOC has size 4, so pointer to 1 byte starting at offset -1 is out-of-bounds
+error: Undefined Behavior: out-of-bounds pointer arithmetic: ALLOC has size 4, so pointer to 1 byte starting at offset -1 is out-of-bounds
   --> RUSTLIB/core/src/ptr/const_ptr.rs:LL:CC
    |
 LL |         unsafe { intrinsics::offset(self, count) }
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pointer arithmetic failed: ALLOC has size 4, so pointer to 1 byte starting at offset -1 is out-of-bounds
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer arithmetic: ALLOC has size 4, so pointer to 1 byte starting at offset -1 is out-of-bounds
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/ptr_offset_0_plus_0.rs

@@ -1,4 +1,4 @@
-// error-pattern: pointer arithmetic failed: null pointer is not a valid pointer
+// error-pattern: null pointer is a dangling pointer
 // compile-flags: -Zmiri-permissive-provenance
 
 fn main() {

tests/fail/intrinsics/ptr_offset_0_plus_0.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: pointer arithmetic failed: null pointer is not a valid pointer
+error: Undefined Behavior: out-of-bounds pointer arithmetic: null pointer is a dangling pointer (it has no provenance)
   --> RUSTLIB/core/src/ptr/mut_ptr.rs:LL:CC
    |
 LL |         unsafe { intrinsics::offset(self, count) as *mut T }
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pointer arithmetic failed: null pointer is not a valid pointer
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer arithmetic: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/ptr_offset_int_plus_int.rs

@@ -1,4 +1,4 @@
-// error-pattern: is not a valid pointer
+// error-pattern: is a dangling pointer
 // compile-flags: -Zmiri-permissive-provenance
 
 fn main() {

tests/fail/intrinsics/ptr_offset_int_plus_int.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: pointer arithmetic failed: 0x1 is not a valid pointer
+error: Undefined Behavior: out-of-bounds pointer arithmetic: 0x1[noalloc] is a dangling pointer (it has no provenance)
   --> RUSTLIB/core/src/ptr/mut_ptr.rs:LL:CC
    |
 LL |         unsafe { intrinsics::offset(self, count) as *mut T }
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pointer arithmetic failed: 0x1 is not a valid pointer
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer arithmetic: 0x1[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/ptr_offset_int_plus_ptr.rs

@@ -1,4 +1,4 @@
-// error-pattern: is not a valid pointer
+// error-pattern: is a dangling pointer
 // compile-flags: -Zmiri-permissive-provenance
 
 fn main() {

tests/fail/intrinsics/ptr_offset_int_plus_ptr.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: pointer arithmetic failed: 0x1 is not a valid pointer
+error: Undefined Behavior: out-of-bounds pointer arithmetic: 0x1[noalloc] is a dangling pointer (it has no provenance)
   --> RUSTLIB/core/src/ptr/mut_ptr.rs:LL:CC
    |
 LL |         unsafe { intrinsics::offset(self, count) as *mut T }
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pointer arithmetic failed: 0x1 is not a valid pointer
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer arithmetic: 0x1[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/ptr_offset_ptr_plus_0.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: pointer arithmetic failed: ALLOC has size 4, so pointer at offset 32 is out-of-bounds
+error: Undefined Behavior: out-of-bounds pointer arithmetic: ALLOC has size 4, so pointer at offset 32 is out-of-bounds
   --> RUSTLIB/core/src/ptr/mut_ptr.rs:LL:CC
    |
 LL |         unsafe { intrinsics::offset(self, count) as *mut T }
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pointer arithmetic failed: ALLOC has size 4, so pointer at offset 32 is out-of-bounds
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer arithmetic: ALLOC has size 4, so pointer at offset 32 is out-of-bounds
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/intrinsics/write_bytes_null.rs

@@ -6,5 +6,5 @@ extern "rust-intrinsic" {
 }
 
 fn main() {
-    unsafe { write_bytes::<u8>(std::ptr::null_mut(), 0, 0) }; //~ ERROR memory access failed: null pointer is not a valid pointer
+    unsafe { write_bytes::<u8>(std::ptr::null_mut(), 0, 0) }; //~ ERROR memory access failed: null pointer is a dangling pointer
 }

tests/fail/intrinsics/write_bytes_null.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: memory access failed: null pointer is not a valid pointer
+error: Undefined Behavior: memory access failed: null pointer is a dangling pointer (it has no provenance)
   --> $DIR/write_bytes_null.rs:LL:CC
    |
 LL |     unsafe { write_bytes::<u8>(std::ptr::null_mut(), 0, 0) };
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is not a valid pointer
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: null pointer is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/provenance/provenance_transmute.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: $HEX is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: $HEX[noalloc] is a dangling pointer (it has no provenance)
   --> $DIR/provenance_transmute.rs:LL:CC
    |
 LL |         let _val = *left_ptr;
-   |                    ^^^^^^^^^ dereferencing pointer failed: $HEX is not a valid pointer
+   |                    ^^^^^^^^^ dereferencing pointer failed: $HEX[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/provenance/ptr_int_unexposed.stderr

@@ -1,8 +1,8 @@
-error: Undefined Behavior: dereferencing pointer failed: $HEX is not a valid pointer
+error: Undefined Behavior: dereferencing pointer failed: $HEX[noalloc] is a dangling pointer (it has no provenance)
   --> $DIR/ptr_int_unexposed.rs:LL:CC
    |
 LL |     assert_eq!(unsafe { *ptr }, 3);
-   |                         ^^^^ dereferencing pointer failed: $HEX is not a valid pointer
+   |                         ^^^^ dereferencing pointer failed: $HEX[noalloc] is a dangling pointer (it has no provenance)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information

tests/fail/provenance/ptr_invalid.rs

@@ -5,5 +5,5 @@ fn main() {
     let x = 42;
     let xptr = &x as *const i32;
     let xptr_invalid = std::ptr::invalid::<i32>(xptr.expose_addr());
-    let _val = unsafe { *xptr_invalid }; //~ ERROR is not a valid pointer
+    let _val = unsafe { *xptr_invalid }; //~ ERROR is a dangling pointer
 }