1 files changed, 39 insertions, 0 deletions
diff --git a/third_party/rust/futures/tests/select_ok.rs b/third_party/rust/futures/tests/select_ok.rs
new file mode 100644
index 0000000000..db88a95c7a
--- /dev/null
+++ b/third_party/rust/futures/tests/select_ok.rs
@@ -0,0 +1,39 @@
+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);
+}