error[E0739]: attribute should be applied to a function definition
  --> $DIR/async-block.rs:6:13
   |
LL |       let _ = #[track_caller] async {
   |  _____________^^^^^^^^^^^^^^^_-
LL | |
LL | |     };
   | |_____- not a function definition

error: aborting due to previous error

For more information about this error, try `rustc --explain E0739`.