error[E0277]: the `?` operator can only be applied to values that implement `Try`
  --> $DIR/issue-97704.rs:9:5
   |
LL |     func(async { Ok::<_, i32>(()) })?;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `?` operator cannot be applied to type `impl Future<Output = Result<(), i32>>`
   |
   = help: the trait `Try` is not implemented for `impl Future<Output = Result<(), i32>>`
help: consider `await`ing on the `Future`
   |
LL |     func(async { Ok::<_, i32>(()) }).await?;
   |                                     ++++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.