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);

winit/Cargo.toml

@@ -16,12 +16,17 @@ debug = []
 [dependencies]
 winit = { version = "0.20.0-alpha3", git = "https://github.com/hecrj/winit", rev = "709808eb4e69044705fcb214bcc30556db761405"}
 log = "0.4"
-futures = { version = "0.3", features = ["thread-pool"] }
+futures = "0.3"
 
 [dependencies.iced_native]
 version = "0.1.0-alpha"
 path = "../native"
 
+[dependencies.iced_futures]
+version = "0.1.0-alpha"
+path = "../futures"
+features = ["thread-pool"]
+
 [dependencies.window_clipboard]
 git = "https://github.com/hecrj/window_clipboard"
 rev = "22c6dd6c04cd05d528029b50a30c56417cd4bebf"