error[E0597]: `y` does not live long enough
  --> $DIR/E0597.rs:8:16
   |
LL |     let y = 0;
   |         - binding `y` declared here
LL |     x.x = Some(&y);
   |                ^^ borrowed value does not live long enough
LL |
LL | }
   | -
   | |
   | `y` dropped here while still borrowed
   | borrow might be used here, when `x` is dropped and runs the `Drop` code for type `Foo`
   |
   = note: values in a scope are dropped in the opposite order they are defined

error: aborting due to 1 previous error

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