| // issue 65419 - Attempting to run an async fn after completion mentions coroutines when it should |
| // be talking about `async fn`s instead. |
| |
| // run-fail |
| // error-pattern: thread 'main' panicked |
| // error-pattern: `async fn` resumed after completion |
| // edition:2018 |
| // ignore-wasm no panic or subprocess support |
| // ignore-emscripten no panic or subprocess support |
| |
| #![feature(coroutines, coroutine_trait)] |
| |
| async fn foo() { |
| } |
| |
| fn main() { |
| let mut future = Box::pin(foo()); |
| executor::block_on(future.as_mut()); |
| executor::block_on(future.as_mut()); |
| } |
| |
| mod executor { |
| use core::{ |
| future::Future, |
| pin::Pin, |
| task::{Context, Poll, RawWaker, RawWakerVTable, Waker}, |
| }; |
| |
| pub fn block_on<F: Future>(mut future: F) -> F::Output { |
| let mut future = unsafe { Pin::new_unchecked(&mut future) }; |
| |
| static VTABLE: RawWakerVTable = RawWakerVTable::new( |
| |_| unimplemented!("clone"), |
| |_| unimplemented!("wake"), |
| |_| unimplemented!("wake_by_ref"), |
| |_| (), |
| ); |
| let waker = unsafe { Waker::from_raw(RawWaker::new(core::ptr::null(), &VTABLE)) }; |
| let mut context = Context::from_waker(&waker); |
| |
| loop { |
| if let Poll::Ready(val) = future.as_mut().poll(&mut context) { |
| break val; |
| } |
| } |
| } |
| } |