error[E0597]: `y` does not live long enough
  --> $DIR/promote_const_let.rs:4:9
   |
LL |     let x: &'static u32 = {
   |            ------------ type annotation requires that `y` is borrowed for `'static`
LL |         let y = 42;
   |             - binding `y` declared here
LL |         &y
   |         ^^ borrowed value does not live long enough
LL |     };
   |     - `y` dropped here while still borrowed

error[E0716]: temporary value dropped while borrowed
  --> $DIR/promote_const_let.rs:6:28
   |
LL |       let x: &'static u32 = &{
   |  ____________------------____^
   | |            |
   | |            type annotation requires that borrow lasts for `'static`
LL | |         let y = 42;
LL | |         y
LL | |     };
   | |_____^ creates a temporary value which is freed while still in use
LL |   }
   |   - temporary value is freed at the end of this statement

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0597, E0716.
For more information about an error, try `rustc --explain E0597`.