src/test/ui/lint/must_not_suspend/trait.rs

   1 // edition:2018
   2 #![feature(must_not_suspend)]
   3 #![deny(must_not_suspend)]
   4
   5 #[must_not_suspend]
   6 trait Wow {}
   7
   8 impl Wow for i32 {}
   9
  10 fn r#impl() -> impl Wow {
  11     1
  12 }
  13
  14 fn r#dyn() -> Box<dyn Wow> {
  15     Box::new(1)
  16 }
  17
  18 async fn other() {}
  19
  20 pub async fn uhoh() {
  21     let _guard1 = r#impl(); //~ ERROR implementer of `Wow` held across
  22     let _guard2 = r#dyn(); //~ ERROR boxed `Wow` trait object held across
  23
  24     other().await;
  25 }
  26
  27 fn main() {
  28 }