error[E0597]: `x` does not live long enough
  --> $DIR/issue-11925.rs:18:36
   |
18 |         let f = to_fn_once(move|| &x);
   |                                    ^
   |                                    |
   |                                    borrow occurs here
   |                                    `x` dropped here while still borrowed
...
23 | }
   | - borrowed value needs to live until here

error: aborting due to previous error(s)