doc: add a comment in cancel_during_run. (#5267)

Signed-off-by: Tricster <mediosrity@gmail.com> Signed-off-by: Tricster <mediosrity@gmail.com>
2022-11-18 12:45:05 +08:00
parent b6aeaf4fe5
commit 7e4077805b
1 changed files with 3 additions and 0 deletions
--- a/tests/all/async_functions.rs
+++ b/tests/all/async_functions.rs
@@ -269,6 +269,9 @@ async fn cancel_during_run() {
            *caller.data_mut() = 1;
            let dtor = SetOnDrop(caller);
            Box::new(async move {
+                // SetOnDrop is not destroyed when dropping the reference of it
+                // here. Instead, it is moved into the future where it's forced
+                // to live in and will be destroyed at the end of the future.
                drop(&dtor);
                tokio::task::yield_now().await;
                Ok(())