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use core::pin::Pin; use core::future::Future; use crate::stream::DoubleEndedStream; use crate::task::{Context, Poll}; #[doc(hidden)] #[allow(missing_debug_implementations)] pub struct NextBackFuture<'a, T: Unpin + ?Sized> { pub(crate) stream: &'a mut T, } impl<T: DoubleEndedStream + Unpin + ?Sized> Future for NextBackFuture<'_, T> { type Output = Option<T::Item>; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { Pin::new(&mut *self.stream).poll_next_back(cx) } }