error[E0716]: temporary value dropped while borrowed
  --> $DIR/promotion.rs:17:37
   |
LL |             let _x: &'static i32 = &div_by_zero();
   |                     ------------    ^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
   |                     |
   |                     type annotation requires that borrow lasts for `'static`
LL |
LL |         }
   |         - temporary value is freed at the end of this statement

error: aborting due to previous error

For more information about this error, try `rustc --explain E0716`.