Make thread-pool optional in iced_futures

futures/Cargo.toml

@@ -10,12 +10,14 @@ documentation = "https://docs.rs/iced_futures"
 keywords = ["gui", "ui", "graphics", "interface", "futures"]
 categories = ["gui"]
 
+[features]
+thread-pool = ["futures/thread-pool"]
+
 [dependencies]
 log = "0.4"
 
 [dependencies.futures]
 version = "0.3"
-features = ["thread-pool"]
 
 [dependencies.tokio]
 version = "0.2"

futures/src/runtime/executor.rs

@@ -8,6 +8,7 @@ pub trait Executor {
     }
 }
 
+#[cfg(feature = "thread-pool")]
 impl Executor for futures::executor::ThreadPool {
     fn spawn(&self, future: impl Future<Output = ()> + Send + 'static) {
         self.spawn_ok(future);