error[E0597]: `a` does not live long enough
  --> $DIR/issue-36537.rs:5:13
   |
LL |         let a = 42;
   |             - binding `a` declared here
LL |         p = &a;
   |             ^^ borrowed value does not live long enough
...
LL |     }
   |     - `a` dropped here while still borrowed
LL |     p.use_ref();
   |     - borrow later used here

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0597`.