chore: bump to newer nightly (#1426)

tokio-threadpool/src/sender.rs

@@ -136,7 +136,7 @@ impl tokio_executor::Executor for Sender {
     }
 }
 
-impl<'a> tokio_executor::Executor for &'a Sender {
+impl tokio_executor::Executor for &Sender {
     fn status(&self) -> Result<(), tokio_executor::SpawnError> {
         let state: pool::State = self.pool.state.load(Acquire).into();
 

tokio-threadpool/src/task/mod.rs

@@ -124,7 +124,7 @@ impl Task {
         let res = panic::catch_unwind(panic::AssertUnwindSafe(|| {
             struct Guard<'a>(&'a mut Option<BoxFuture>, bool);
 
-            impl<'a> Drop for Guard<'a> {
+            impl Drop for Guard<'_> {
                 fn drop(&mut self) {
                     // This drops the future
                     if self.1 {

tokio-threadpool/src/worker/mod.rs

@@ -530,7 +530,7 @@ impl Worker {
             worker: &'a Worker,
         }
 
-        impl<'a> Drop for Guard<'a> {
+        impl Drop for Guard<'_> {
             fn drop(&mut self) {
                 // A task is allocated at run when it was explicitly notified
                 // that the task has capacity to block. When this happens, that

tokio-threadpool/tests/threadpool.rs

@@ -350,7 +350,7 @@ fn busy_threadpool_is_not_idle() {
 
     struct IdleFut<'a>(&'a mut Shutdown);
 
-    impl<'a> Future for IdleFut<'a> {
+    impl Future for IdleFut<'_> {
         type Output = ();
 
         fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> {