1 files changed, 33 insertions, 0 deletions
diff --git a/third_party/rust/futures/tests/future_obj.rs b/third_party/rust/futures/tests/future_obj.rs
new file mode 100644
index 0000000000..c6b18fc85c
--- /dev/null
+++ b/third_party/rust/futures/tests/future_obj.rs
@@ -0,0 +1,33 @@
+use futures::future::{Future, FutureObj, FutureExt};
+use std::pin::Pin;
+use futures::task::{Context, Poll};
+
+#[test]
+fn dropping_does_not_segfault() {
+    FutureObj::new(async { String::new() }.boxed());
+}
+
+#[test]
+fn dropping_drops_the_future() {
+    let mut times_dropped = 0;
+
+    struct Inc<'a>(&'a mut u32);
+
+    impl Future for Inc<'_> {
+        type Output = ();
+
+        fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<()> {
+            unimplemented!()
+        }
+    }
+
+    impl Drop for Inc<'_> {
+        fn drop(&mut self) {
+            *self.0 += 1;
+        }
+    }
+
+    FutureObj::new(Inc(&mut times_dropped).boxed());
+
+    assert_eq!(times_dropped, 1);
+}