From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 third_party/rust/futures-util/src/stream/empty.rs | 45 +++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 third_party/rust/futures-util/src/stream/empty.rs

(limited to 'third_party/rust/futures-util/src/stream/empty.rs')

diff --git a/third_party/rust/futures-util/src/stream/empty.rs b/third_party/rust/futures-util/src/stream/empty.rs
new file mode 100644
index 0000000000..e4fd87326b
--- /dev/null
+++ b/third_party/rust/futures-util/src/stream/empty.rs
@@ -0,0 +1,45 @@
+use super::assert_stream;
+use core::marker::PhantomData;
+use core::pin::Pin;
+use futures_core::stream::{FusedStream, Stream};
+use futures_core::task::{Context, Poll};
+
+/// Stream for the [`empty`] function.
+#[derive(Debug)]
+#[must_use = "streams do nothing unless polled"]
+pub struct Empty<T> {
+    _phantom: PhantomData<T>,
+}
+
+/// Creates a stream which contains no elements.
+///
+/// The returned stream will always return `Ready(None)` when polled.
+pub fn empty<T>() -> Empty<T> {
+    assert_stream::<T, _>(Empty { _phantom: PhantomData })
+}
+
+impl<T> Unpin for Empty<T> {}
+
+impl<T> FusedStream for Empty<T> {
+    fn is_terminated(&self) -> bool {
+        true
+    }
+}
+
+impl<T> Stream for Empty<T> {
+    type Item = T;
+
+    fn poll_next(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        Poll::Ready(None)
+    }
+
+    fn size_hint(&self) -> (usize, Option<usize>) {
+        (0, Some(0))
+    }
+}
+
+impl<T> Clone for Empty<T> {
+    fn clone(&self) -> Self {
+        empty()
+    }
+}
-- 
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