1 files changed, 42 insertions, 0 deletions
diff --git a/vendor/futures-util/src/stream/stream/select_next_some.rs b/vendor/futures-util/src/stream/stream/select_next_some.rs
new file mode 100644
index 000000000..3115e14d9
--- /dev/null
+++ b/vendor/futures-util/src/stream/stream/select_next_some.rs
@@ -0,0 +1,42 @@
+use crate::stream::StreamExt;
+use core::pin::Pin;
+use futures_core::future::{FusedFuture, Future};
+use futures_core::ready;
+use futures_core::stream::FusedStream;
+use futures_core::task::{Context, Poll};
+
+/// Future for the [`select_next_some`](super::StreamExt::select_next_some)
+/// method.
+#[derive(Debug)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+pub struct SelectNextSome<'a, St: ?Sized> {
+    stream: &'a mut St,
+}
+
+impl<'a, St: ?Sized> SelectNextSome<'a, St> {
+    pub(super) fn new(stream: &'a mut St) -> Self {
+        Self { stream }
+    }
+}
+
+impl<St: ?Sized + FusedStream + Unpin> FusedFuture for SelectNextSome<'_, St> {
+    fn is_terminated(&self) -> bool {
+        self.stream.is_terminated()
+    }
+}
+
+impl<St: ?Sized + FusedStream + Unpin> Future for SelectNextSome<'_, St> {
+    type Output = St::Item;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        assert!(!self.stream.is_terminated(), "SelectNextSome polled after terminated");
+
+        if let Some(item) = ready!(self.stream.poll_next_unpin(cx)) {
+            Poll::Ready(item)
+        } else {
+            debug_assert!(self.stream.is_terminated());
+            cx.waker().wake_by_ref();
+            Poll::Pending
+        }
+    }
+}