refactor(executor): move Task::poll to impl Future

Author: mkroening

src/executor/mod.rs

@@ -9,7 +9,7 @@ pub(crate) mod vsock;
 use alloc::sync::Arc;
 use alloc::task::Wake;
 use core::future::Future;
-use core::pin::pin;
+use core::pin::{Pin, pin};
 use core::sync::atomic::AtomicU32;
 use core::task::{Context, Poll, Waker};
 use core::time::Duration;
@@ -102,7 +102,7 @@ pub(crate) fn run() {
 			let mut task = { core_local::async_tasks().pop_front().unwrap() };
 			trace!("Run async task {}", task.id());
 
-			if task.poll(&mut cx).is_pending() {
+			if Pin::new(&mut task).poll(&mut cx).is_pending() {
 				core_local::async_tasks().push_back(task);
 			}
 		}

src/executor/task.rs

@@ -39,8 +39,12 @@ impl AsyncTask {
 	pub fn id(&self) -> AsyncTaskId {
 		self.id
 	}
+}
+
+impl Future for AsyncTask {
+	type Output = ();
 
-	pub fn poll(&mut self, context: &mut Context<'_>) -> Poll<()> {
-		self.future.as_mut().poll(context)
+	fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+		self.as_mut().future.as_mut().poll(cx)
 	}
 }