doubly_futures

src/model_03.rs

@@ -271,3 +271,12 @@ fn with_futures() {
     let x = futures::executor::block_on(x.into_future_()).into_::<i32>();
     assert_eq!(x, 10);
 }
+
+#[test]
+fn doubly_futures() {
+    type U = Composition<Futures, Futures>;
+    let x = generic_test::<U>();
+    let x = futures::executor::block_on(async { x.into_future_().await.into_future_().await })
+        .into_::<i32>();
+    assert_eq!(x, 10);
+}