error[E0658]: `#[track_caller]` on closures is currently unstable --> $DIR/async-block.rs:6:13 | LL | let _ = #[track_caller] async { | ^^^^^^^^^^^^^^^ | = note: see issue #87417 for more information = help: add `#![feature(closure_track_caller)]` to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.