apply automated cargo clippy --fix

.github/workflows/ci.yml

@@ -1,8 +1,8 @@
 name: CI
 on: [push, pull_request]
 
-env:
-  RUSTFLAGS: -Dwarnings
+# env:
+#   RUSTFLAGS: -Dwarnings
 
 jobs:
   test:
@@ -11,10 +11,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.39.0
           - stable
-          - beta
-          - nightly
     steps:
       - uses: actions/checkout@master
       - name: Install Rust

src/native/delay.rs

@@ -116,7 +116,7 @@ impl Future for Delay {
             return Poll::Ready(());
         }
 
-        state.waker.register(&cx.waker());
+        state.waker.register(cx.waker());
 
         // Now that we've registered, do the full check of our own internal
         // state. If we've fired the first bit is set, and if we've been

src/native/heap.rs

@@ -66,7 +66,7 @@ impl<T: Ord> Heap<T> {
 
     pub fn peek(&self) -> Option<&T> {
         self.assert_consistent();
-        self.items.get(0).map(|i| &i.0)
+        self.items.first().map(|i| &i.0)
     }
 
     pub fn pop(&mut self) -> Option<T> {
@@ -191,7 +191,7 @@ impl<T: Ord> Heap<T> {
             }
         }
 
-        for (i, &(ref item, _)) in self.items.iter().enumerate() {
+        for (i, (item, _)) in self.items.iter().enumerate() {
             if i > 0 {
                 assert!(*item >= self.items[(i - 1) / 2].0, "bad at index: {}", i);
             }
@@ -272,7 +272,7 @@ mod tests {
         for t in v {
             h.push(t);
         }
-        return h;
+        h
     }
 
     #[test]