1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/rust/futures-0.1.29/src/future/empty.rs b/third_party/rust/futures-0.1.29/src/future/empty.rs
new file mode 100644
index 0000000000..fbb56b26fd
--- /dev/null
+++ b/third_party/rust/futures-0.1.29/src/future/empty.rs
@@ -0,0 +1,31 @@
+//! Definition of the Empty combinator, a future that's never ready.
+
+use core::marker;
+
+use {Future, Poll, Async};
+
+/// A future which is never resolved.
+///
+/// This future can be created with the `empty` function.
+#[derive(Debug)]
+#[must_use = "futures do nothing unless polled"]
+pub struct Empty<T, E> {
+    _data: marker::PhantomData<(T, E)>,
+}
+
+/// Creates a future which never resolves, representing a computation that never
+/// finishes.
+///
+/// The returned future will forever return `Async::NotReady`.
+pub fn empty<T, E>() -> Empty<T, E> {
+    Empty { _data: marker::PhantomData }
+}
+
+impl<T, E> Future for Empty<T, E> {
+    type Item = T;
+    type Error = E;
+
+    fn poll(&mut self) -> Poll<T, E> {
+        Ok(Async::NotReady)
+    }
+}