error[E0728]: `await` is only allowed inside `async` functions and blocks
  --> $DIR/non-async-enclosing-span.rs:9:28
   |
LL | fn main() {
   | --------- this is not `async`
LL |     let x = move || {};
LL |     let y = do_the_thing().await;
   |                            ^^^^^ only allowed inside `async` functions and blocks

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0728`.