warning: found async drop types in dependency `async_drop_dep`, but async_drop feature is disabled for `dependency_dropped`
  --> $DIR/dependency-dropped.rs:7:1
   |
LL | #![cfg_attr(with_feature, feature(async_drop))]
   | ^
   |
   = help: if async drop type will be dropped in a crate without `feature(async_drop)`, sync Drop will be used

warning: 1 warning emitted