use Box::into_raw

Author: RalfJung

tests/compile-fail/ptr_offset_int_plus_ptr.rs

@@ -1,7 +1,7 @@
 // error-pattern: pointer value as raw bytes
 
 fn main() {
-    let ptr = &mut *Box::new(0u32) as *mut u32;
+    let ptr = Box::into_raw(Box::new(0u32));
     // Can't start with an integer pointer and get to something usable
     unsafe {
         let _ = (1 as *mut u8).offset(ptr as isize);

tests/compile-fail/ptr_wrapping_offset_int_plus_ptr.rs

@@ -1,7 +1,7 @@
 // error-pattern: pointer value as raw bytes
 
 fn main() {
-    let ptr = &mut *Box::new(0u32) as *mut u32;
+    let ptr = Box::into_raw(Box::new(0u32));
     // Can't start with an integer pointer and get to something usable
     let ptr = (1 as *mut u8).wrapping_offset(ptr as isize);
     let _ = unsafe { *ptr };