error[E0728]: `await` is only allowed inside `async` functions and blocks
  --> $DIR/issue-62009-1.rs:6:23
   |
LL | fn main() {
   |    ---- this is not `async`
LL |     async { let (); }.await;
   |                       ^^^^^ only allowed inside `async` functions and blocks

error[E0728]: `await` is only allowed inside `async` functions and blocks
  --> $DIR/issue-62009-1.rs:10:7
   |
LL | fn main() {
   |    ---- this is not `async`
...
LL |     }.await;
   |       ^^^^^ only allowed inside `async` functions and blocks

error[E0728]: `await` is only allowed inside `async` functions and blocks
  --> $DIR/issue-62009-1.rs:12:16
   |
LL | fn main() {
   |    ---- this is not `async`
...
LL |     (|_| 2333).await;
   |                ^^^^^ only allowed inside `async` functions and blocks

error[E0277]: `{closure@$DIR/issue-62009-1.rs:12:6: 12:9}` is not a future
  --> $DIR/issue-62009-1.rs:12:16
   |
LL |     (|_| 2333).await;
   |               -^^^^^
   |               ||
   |               |`{closure@$DIR/issue-62009-1.rs:12:6: 12:9}` is not a future
   |               help: remove the `.await`
   |
   = help: the trait `Future` is not implemented for closure `{closure@$DIR/issue-62009-1.rs:12:6: 12:9}`
   = note: {closure@$DIR/issue-62009-1.rs:12:6: 12:9} must be a future or must implement `IntoFuture` to be awaited
   = note: required for `{closure@$DIR/issue-62009-1.rs:12:6: 12:9}` to implement `IntoFuture`

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0277, E0728.
For more information about an error, try `rustc --explain E0277`.