error: `b` does not live long enough
  --> $DIR/mut-ptr-cant-outlive-ref.rs:19:5
   |
18 |         p = &*b; //~ ERROR `b` does not live long enough
   |               - borrow occurs here
19 |     }
   |     ^ `b` dropped here while still borrowed
20 | }
   | - borrowed value needs to live until here

error: aborting due to previous error(s)