Fix rust-lang#3014 UB in listing-19-03

nico-abram · Jan 21, 2022 · 964fd72 · 964fd72
1 parent a4efcd5
commit 964fd72
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/listings/ch19-advanced-features/listing-19-03/src/main.rs b/listings/ch19-advanced-features/listing-19-03/src/main.rs
@@ -2,8 +2,8 @@ fn main() {
     // ANCHOR: here
     let mut num = 5;
 
-    let r1 = &num as *const i32;
     let r2 = &mut num as *mut i32;
+    let r1 = unsafe { &*r2 as *const i32 };
 
     unsafe {
         println!("r1 is: {}", *r1);