tests/ui/async-await/issue-73137.rs

   1 // Regression test for <https://github.com/rust-lang/rust/issues/73137>
   2
   3 // run-pass
   4 // edition:2018
   5
   6 #![allow(dead_code)]
   7 use std::future::Future;
   8 use std::task::{Waker, Wake, Context};
   9 use std::sync::Arc;
  10
  11 struct DummyWaker;
  12 impl Wake for DummyWaker {
  13     fn wake(self: Arc<Self>) {}
  14 }
  15
  16 struct Foo {
  17     a: usize,
  18     b: &'static u32,
  19 }
  20
  21 #[inline(never)]
  22 fn nop<T>(_: T) {}
  23
  24 fn main() {
  25     let mut fut = Box::pin(async {
  26         let action = Foo {
  27             b: &42,
  28             a: async { 0 }.await,
  29         };
  30
  31         // An error in the generator transform caused `b` to be overwritten with `a` when `b` was
  32         // borrowed.
  33         nop(&action.b);
  34         assert_ne!(0usize, unsafe { std::mem::transmute(action.b) });
  35
  36         async {}.await;
  37     });
  38     let waker = Waker::from(Arc::new(DummyWaker));
  39     let mut cx = Context::from_waker(&waker);
  40     let _ = fut.as_mut().poll(&mut cx);
  41 }