error[E0597]: `a` does not live long enough
  --> $DIR/issue-46036.rs:8:24
   |
LL |     let a = 3;
   |         - binding `a` declared here
LL |     let foo = Foo { x: &a };
   |                        ^^
   |                        |
   |                        borrowed value does not live long enough
   |                        this usage requires that `a` is borrowed for `'static`
LL |     loop { }
LL | }
   | - `a` dropped here while still borrowed

error: aborting due to 1 previous error

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