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