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//@ edition: 2021
//@ check-pass
// This test verifies that we do not create a query cycle when typechecking has several inference
// variables that point to the same coroutine interior type.
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
type ChannelTask = Pin<Box<dyn Future<Output = ()> + Send>>;
pub fn register_message_type() -> ChannelTask {
Box::pin(async move {
let f = |__cx: &mut Context<'_>| Poll::<()>::Pending;
PollFn { f }.await
})
}
struct PollFn<F> {
f: F,
}
impl<F> Unpin for PollFn<F> {}
impl<T, F> Future for PollFn<F>
where
F: FnMut(&mut Context<'_>) -> Poll<T>,
{
type Output = T;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
(&mut self.f)(cx)
}
}
fn main() {}
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