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|
use std::{
future::Future,
pin::Pin,
marker::Unpin,
task::{Context, Poll},
};
struct Sleep(std::marker::PhantomPinned);
impl Future for Sleep {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
Poll::Ready(())
}
}
impl Drop for Sleep {
fn drop(&mut self) {}
}
fn sleep() -> Sleep {
Sleep(std::marker::PhantomPinned)
}
struct MyFuture {
sleep: Sleep,
}
impl MyFuture {
fn new() -> Self {
Self {
sleep: sleep(),
}
}
}
impl Future for MyFuture {
type Output = ();
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
Pin::new(&mut self.sleep).poll(cx)
//~^ ERROR `PhantomPinned` cannot be unpinned
}
}
fn main() {}
|
