1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/rust/futures-util/src/io/flush.rs b/third_party/rust/futures-util/src/io/flush.rs
new file mode 100644
index 0000000000..b75d14c5d3
--- /dev/null
+++ b/third_party/rust/futures-util/src/io/flush.rs
@@ -0,0 +1,31 @@
+use futures_core::future::Future;
+use futures_core::task::{Context, Poll};
+use futures_io::AsyncWrite;
+use std::io;
+use std::pin::Pin;
+
+/// Future for the [`flush`](super::AsyncWriteExt::flush) method.
+#[derive(Debug)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+pub struct Flush<'a, W: ?Sized> {
+    writer: &'a mut W,
+}
+
+impl<W: ?Sized + Unpin> Unpin for Flush<'_, W> {}
+
+impl<'a, W: AsyncWrite + ?Sized + Unpin> Flush<'a, W> {
+    pub(super) fn new(writer: &'a mut W) -> Self {
+        Self { writer }
+    }
+}
+
+impl<W> Future for Flush<'_, W>
+where
+    W: AsyncWrite + ?Sized + Unpin,
+{
+    type Output = io::Result<()>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        Pin::new(&mut *self.writer).poll_flush(cx)
+    }
+}