error[E0728]: `await` is only allowed inside `async` functions and blocks
  --> $DIR/async-outside-of-await-issue-121096.rs:7:7
   |
LL | fn main() {
   | --------- this is not `async`
...
LL |     }.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`.