1 files changed, 30 insertions, 0 deletions
diff --git a/third_party/rust/futures/tests/future_select_ok.rs b/third_party/rust/futures/tests/future_select_ok.rs
new file mode 100644
index 0000000000..8aec00362d
--- /dev/null
+++ b/third_party/rust/futures/tests/future_select_ok.rs
@@ -0,0 +1,30 @@
+use futures::executor::block_on;
+use futures::future::{err, ok, select_ok};
+
+#[test]
+fn ignore_err() {
+    let v = vec![err(1), err(2), ok(3), ok(4)];
+
+    let (i, v) = block_on(select_ok(v)).ok().unwrap();
+    assert_eq!(i, 3);
+
+    assert_eq!(v.len(), 1);
+
+    let (i, v) = block_on(select_ok(v)).ok().unwrap();
+    assert_eq!(i, 4);
+
+    assert!(v.is_empty());
+}
+
+#[test]
+fn last_err() {
+    let v = vec![ok(1), err(2), err(3)];
+
+    let (i, v) = block_on(select_ok(v)).ok().unwrap();
+    assert_eq!(i, 1);
+
+    assert_eq!(v.len(), 2);
+
+    let i = block_on(select_ok(v)).err().unwrap();
+    assert_eq!(i, 3);
+}