Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/third_party/rust/futures-0.1.31/src/stream/empty.rs b/third_party/rust/futures-0.1.31/src/stream/empty.rs
new file mode 100644
index 0000000000..c53fb80238
--- /dev/null
+++ b/third_party/rust/futures-0.1.31/src/stream/empty.rs
@@ -0,0 +1,29 @@
+use core::marker;
+
+use stream::Stream;
+use {Poll, Async};
+
+/// A stream which contains no elements.
+///
+/// This stream can be created with the `stream::empty` function.
+#[derive(Debug)]
+#[must_use = "streams do nothing unless polled"]
+pub struct Empty<T, E> {
+    _data: marker::PhantomData<(T, E)>,
+}
+
+/// Creates a stream which contains no elements.
+///
+/// The returned stream will always return `Ready(None)` when polled.
+pub fn empty<T, E>() -> Empty<T, E> {
+    Empty { _data: marker::PhantomData }
+}
+
+impl<T, E> Stream for Empty<T, E> {
+    type Item = T;
+    type Error = E;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        Ok(Async::Ready(None))
+    }
+}