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#![feature(pin_macro)] | ||
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use core::future::Future; | ||
use core::pin::Pin; | ||
use core::task::{Context, Poll}; | ||
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use std::sync::Arc; | ||
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struct NopWaker; | ||
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impl std::task::Wake for NopWaker { | ||
fn wake(self: Arc<Self>) {} | ||
} | ||
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pub fn fuzzing_block_on<O, F: Future<Output = O>>(fut: F) -> O { | ||
let mut fut = std::pin::pin!(fut); | ||
let waker = std::task::Waker::from(Arc::new(NopWaker)); | ||
let mut context = std::task::Context::from_waker(&waker); | ||
loop { | ||
match fut.as_mut().poll(&mut context) { | ||
Poll::Ready(v) => return v, | ||
Poll::Pending => {} | ||
} | ||
} | ||
} | ||
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pub struct LastFuture<S> { | ||
last: S, | ||
} | ||
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impl<S> Future for LastFuture<S> | ||
where | ||
Self: Unpin, | ||
S: Unpin + Copy, | ||
{ | ||
type Output = S; | ||
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fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> { | ||
return Poll::Ready(self.last); | ||
} | ||
} | ||
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fn main() { | ||
fuzzing_block_on(async { | ||
LastFuture { last: &0u32 }.await; | ||
LastFuture { last: Option::<u32>::None }.await; | ||
}); | ||
} |