error: reference to `Umm` held across a suspend point, but should not be --> $DIR/ref-drop-tracking.rs:19:13 | LL | let guard = &mut self.u; | ^^^^^ LL | LL | other().await; | ----- the value is held across this suspend point | note: You gotta use Umm's, ya know? --> $DIR/ref-drop-tracking.rs:19:13 | LL | let guard = &mut self.u; | ^^^^^ help: consider using a block (`{ ... }`) to shrink the value's scope, ending before the suspend point --> $DIR/ref-drop-tracking.rs:19:13 | LL | let guard = &mut self.u; | ^^^^^ note: the lint level is defined here --> $DIR/ref-drop-tracking.rs:4:9 | LL | #![deny(must_not_suspend)] | ^^^^^^^^^^^^^^^^ error: aborting due to previous error