From b0038e11bed6d75f87b2c17a82da56b8534c98ce Mon Sep 17 00:00:00 2001
From: Felipe Sere <felipesere@gmail.com>
Date: Thu, 28 Nov 2019 21:52:48 +0100
Subject: [PATCH] Only implement the DoubleEndedStream for once when the flag
 is on

---
 src/stream/once.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/stream/once.rs b/src/stream/once.rs
index 9ce93aa..939722d 100644
--- a/src/stream/once.rs
+++ b/src/stream/once.rs
@@ -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())