error[E0597]: `v` does not live long enough
  --> tests/ui/unsoundness_issue_107.rs:11:21
   |
10 |         let v = vec![0; 10];
   |             - binding `v` declared here
11 |         let v_ref = &v;
   |                     ^^ borrowed value does not live long enough
...
20 |     };
   |     - `v` dropped here while still borrowed
21 |     // use-after-free
22 |     println!("{outer:?}"); // […garbage allocator internals…, 0, 0, 0]
   |               --------- borrow later used here