error[E0728]: `await` is only allowed inside `async` functions and blocks
  --> $DIR/issue-70594.rs:4:11
   |
LL | async fn fun() {
   |          --- this is not `async`
LL |     [1; ().await];
   |           ^^^^^^ only allowed inside `async` functions and blocks

error[E0744]: `.await` is not allowed in a `const`
  --> $DIR/issue-70594.rs:4:9
   |
LL |     [1; ().await];
   |         ^^^^^^^^

error[E0744]: `.await` is not allowed in a `const`
  --> $DIR/issue-70594.rs:4:11
   |
LL |     [1; ().await];
   |           ^^^^^^

error[E0277]: `()` is not a future
  --> $DIR/issue-70594.rs:4:11
   |
LL |     [1; ().await];
   |           ^^^^^^
   |           |
   |           `()` is not a future
   |           help: remove the `.await`
   |
   = help: the trait `Future` is not implemented for `()`
   = note: () must be a future or must implement `IntoFuture` to be awaited
   = note: required for `()` to implement `IntoFuture`

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0277, E0728, E0744.
For more information about an error, try `rustc --explain E0277`.