1 files changed, 27 insertions, 0 deletions
diff --git a/third_party/rust/futures/tests/stream_catch_unwind.rs b/third_party/rust/futures/tests/stream_catch_unwind.rs
new file mode 100644
index 0000000000..8b23a0a7ef
--- /dev/null
+++ b/third_party/rust/futures/tests/stream_catch_unwind.rs
@@ -0,0 +1,27 @@
+use futures::executor::block_on_stream;
+use futures::stream::{self, StreamExt};
+
+#[test]
+fn panic_in_the_middle_of_the_stream() {
+    let stream = stream::iter(vec![Some(10), None, Some(11)]);
+
+    // panic on second element
+    let stream_panicking = stream.map(|o| o.unwrap());
+    let mut iter = block_on_stream(stream_panicking.catch_unwind());
+
+    assert_eq!(10, iter.next().unwrap().ok().unwrap());
+    assert!(iter.next().unwrap().is_err());
+    assert!(iter.next().is_none());
+}
+
+#[test]
+fn no_panic() {
+    let stream = stream::iter(vec![10, 11, 12]);
+
+    let mut iter = block_on_stream(stream.catch_unwind());
+
+    assert_eq!(10, iter.next().unwrap().ok().unwrap());
+    assert_eq!(11, iter.next().unwrap().ok().unwrap());
+    assert_eq!(12, iter.next().unwrap().ok().unwrap());
+    assert!(iter.next().is_none());
+}