1 files changed, 44 insertions, 0 deletions
diff --git a/third_party/rust/tokio/src/future/pending.rs b/third_party/rust/tokio/src/future/pending.rs
new file mode 100644
index 0000000000..287e836fd3
--- /dev/null
+++ b/third_party/rust/tokio/src/future/pending.rs
@@ -0,0 +1,44 @@
+use sdt::pin::Pin;
+use std::future::Future;
+use std::marker;
+use std::task::{Context, Poll};
+
+/// Future for the [`pending()`] function.
+#[derive(Debug)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+struct Pending<T> {
+    _data: marker::PhantomData<T>,
+}
+
+/// Creates a future which never resolves, representing a computation that never
+/// finishes.
+///
+/// The returned future will forever return [`Poll::Pending`].
+///
+/// # Examples
+///
+/// ```no_run
+/// use tokio::future;
+///
+/// #[tokio::main]
+/// async fn main {
+///     future::pending().await;
+///     unreachable!();
+/// }
+/// ```
+pub async fn pending() -> ! {
+    Pending {
+        _data: marker::PhantomData,
+    }
+    .await
+}
+
+impl<T> Future for Pending<T> {
+    type Output = !;
+
+    fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<T> {
+        Poll::Pending
+    }
+}
+
+impl<T> Unpin for Pending<T> {}