Fix default backend in iced_futures

Fixes #1228.

futures/src/backend/default.rs

@@ -22,12 +22,19 @@ mod platform {
     ))]
     pub use crate::backend::native::smol::*;
 
+    #[cfg(all(
+        feature = "thread-pool",
+        not(any(feature = "tokio", feature = "async-std", feature = "smol"))
+    ))]
+    pub use crate::backend::native::thread_pool::*;
+
     #[cfg(not(any(
         feature = "tokio",
         feature = "async-std",
         feature = "smol",
+        feature = "thread-pool"
     )))]
-    pub use crate::backend::native::thread_pool::*;
+    pub use crate::backend::null::*;
 }
 
 #[cfg(target_arch = "wasm32")]

futures/src/backend/native/thread_pool.rs

@@ -3,9 +3,9 @@ use futures::Future;
 
 /// A thread pool executor for futures.
 #[cfg_attr(docsrs, doc(cfg(feature = "thread-pool")))]
-pub type ThreadPool = futures::executor::ThreadPool;
+pub type Executor = futures::executor::ThreadPool;
 
-impl crate::Executor for futures::executor::ThreadPool {
+impl crate::Executor for Executor {
     fn new() -> Result<Self, futures::io::Error> {
         futures::executor::ThreadPool::new()
     }
@@ -14,3 +14,7 @@ impl crate::Executor for futures::executor::ThreadPool {
         self.spawn_ok(future);
     }
 }
+
+pub mod time {
+    //! Listen and react to time.
+}

futures/src/backend/null.rs

@@ -16,3 +16,7 @@ impl crate::Executor for Executor {
     #[cfg(target_arch = "wasm32")]
     fn spawn(&self, _future: impl Future<Output = ()> + 'static) {}
 }
+
+pub mod time {
+    //! Listen and react to time.
+}