`spawn!(async {})` works in newest nightly
@@ -675,11 +675,10 @@ pub trait FutureExt: Future {
/// assert_ne!(thread::current().name(), Some("my-pool-0"));
///
/// // Spawned task runs on the executor specified via `with_executor`
- /// let future = async {
+ /// spawn!(async {
/// assert_eq!(thread::current().name(), Some("my-pool-0"));
/// # tx.send("ran").unwrap();
- /// };
- /// spawn!(future).unwrap();
+ /// }).unwrap();
/// }).with_executor(pool));
///
/// # assert_eq!(await!(rx), Ok("ran"))
