Remove redundant & for waker args in closures

Author: Roman Proskuryakov

src/future.rs

@@ -148,7 +148,7 @@ pub fn poll_fn<F, T>(f: F) -> impl Future<Output = T>
     from_generator(|| {
         let mut f = f;
         loop {
-            let poll_result = get_task_waker(|waker: &_| f(waker));
+            let poll_result = get_task_waker(|waker| f(waker));
             match poll_result {
                 Poll::Pending => yield,
                 Poll::Ready(value) => return value,

src/stream.rs

@@ -10,8 +10,7 @@ pub async fn next<St>(stream: &mut St) -> Option<St::Item>
     where St: Stream + Unpin,
 {
     use crate::future::poll_fn;
-    let poll_next = |waker: &_| Pin::new(&mut *stream).poll_next(waker);
-    let future_next = poll_fn(poll_next);
+    let future_next = poll_fn(|waker| Pin::new(&mut *stream).poll_next(waker));
     await!(future_next)
 }