src/test/ui/lint/must_not_suspend/ref-drop-tracking.rs

   1 // edition:2018
   2 // compile-flags: -Zdrop-tracking
   3 #![feature(must_not_suspend)]
   4 #![deny(must_not_suspend)]
   5
   6 #[must_not_suspend = "You gotta use Umm's, ya know?"]
   7 struct Umm {
   8     i: i64
   9 }
  10
  11 struct Bar {
  12     u: Umm,
  13 }
  14
  15 async fn other() {}
  16
  17 impl Bar {
  18     async fn uhoh(&mut self) {
  19         let guard = &mut self.u; //~ ERROR `Umm` held across
  20
  21         other().await;
  22
  23         *guard = Umm {
  24             i: 2
  25         }
  26     }
  27 }
  28
  29 fn main() {
  30 }