error: lifetime may not live long enough
  --> $DIR/higher-ranked.rs:6:34
   |
LL |       let x = async move |x: &str| {
   |  ____________________________-___-_^
   | |                            |   |
   | |                            |   return type of closure `{async closure body@$DIR/higher-ranked.rs:6:34: 11:6}` contains a lifetime `'2`
   | |                            let's call the lifetime of this reference `'1`
LL | |
LL | |         // This error is proof that the `&str` type is higher-ranked.
LL | |         // This won't work until async closures are fully impl'd.
LL | |         println!("{x}");
LL | |     };
   | |_____^ returning this value requires that `'1` must outlive `'2`

error: aborting due to 1 previous error