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error[E0277]: `()` is not a future
  --> $DIR/async-error-span.rs:10:20
   |
LL | fn get_future() -> impl Future<Output = ()> {
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not a future
   |
   = help: the trait `Future` is not implemented for `()`
   = note: () must be a future or must implement `IntoFuture` to be awaited

error[E0698]: type inside `async fn` body must be known in this context
  --> $DIR/async-error-span.rs:16:9
   |
LL |     let a;
   |         ^ cannot infer type
   |
note: the type is part of the `async fn` body because of this `await`
  --> $DIR/async-error-span.rs:19:18
   |
LL |     get_future().await;
   |                  ^^^^^

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0698.
For more information about an error, try `rustc --explain E0277`.