Only implement the DoubleEndedStream for once when the flag is on
@@ -4,7 +4,9 @@ use pin_project_lite::pin_project;
use crate::stream::Stream;
use crate::task::{Context, Poll};
-use crate::stream::double_ended_stream::DoubleEndedStream;
+
+#[cfg(feature = "unstable")]
+use crate::stream::DoubleEndedStream;
/// Creates a stream that yields a single item.
///
@@ -48,6 +50,7 @@ impl<T> Stream for Once<T> {
}
}
+#[cfg(feature = "unstable")]
impl <T> DoubleEndedStream for Once<T> {
fn poll_next_back(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
Poll::Ready(self.project().value.take())
