future miscompiling to ud2 #60709
Description
Using rustc 1.36.0-nightly (3991285 2019-04-25), the following test compiles to ud2, when using the following command: rustc --edition=2018 -Copt-level=z -Cdebuginfo=2 --test test.rs -o test. Both the opt-level and debuginfo are necessary to get ud2.
#![feature(async_await, await_macro)] #![allow(unused)] #[cfg(test)] mod tests { use std::future::Future; use std::task::Poll; use std::task::Context; use std::pin::Pin; use std::rc::Rc; struct Never(); impl Future for Never { type Output = (); fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> { Poll::Pending } } #[test] fn crashing_test() { let fut = async { let _rc = Rc::new(()); // Also crashes with Arc await!(Never()); }; let _bla = fut; // Moving the future is required. } }