Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 36 insertions, 0 deletions

diff --git a/third_party/rust/futures-0.1.29/src/future/into_stream.rs b/third_party/rust/futures-0.1.29/src/future/into_stream.rs
new file mode 100644
index 0000000000..6e299e6a21
--- /dev/null
+++ b/third_party/rust/futures-0.1.29/src/future/into_stream.rs
@@ -0,0 +1,36 @@
+use {Async, Poll};
+use Future;
+use stream::Stream;
+
+/// Future that forwards one element from the underlying future
+/// (whether it is success of error) and emits EOF after that.
+#[derive(Debug)]
+pub struct IntoStream<F: Future> {
+    future: Option<F>
+}
+
+pub fn new<F: Future>(future: F) -> IntoStream<F> {
+    IntoStream {
+        future: Some(future)
+    }
+}
+
+impl<F: Future> Stream for IntoStream<F> {
+    type Item = F::Item;
+    type Error = F::Error;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        let ret = match self.future {
+            None => return Ok(Async::Ready(None)),
+            Some(ref mut future) => {
+                match future.poll() {
+                    Ok(Async::NotReady) => return Ok(Async::NotReady),
+                    Err(e) => Err(e),
+                    Ok(Async::Ready(r)) => Ok(r),
+                }
+            }
+        };
+        self.future = None;
+        ret.map(|r| Async::Ready(Some(r)))
+    }
+}