Add Application::Executor associated type

futures/src/executor/thread_pool.rs

@@ -0,0 +1,15 @@
+use crate::Executor;
+
+use futures::Future;
+
+pub type ThreadPool = futures::executor::ThreadPool;
+
+impl Executor for futures::executor::ThreadPool {
+    fn new() -> Result<Self, futures::io::Error> {
+        futures::executor::ThreadPool::new()
+    }
+
+    fn spawn(&self, future: impl Future<Output = ()> + Send + 'static) {
+        self.spawn_ok(future);
+    }
+}