Drop `Send` in `Command` and `Executor` on Wasm

3 files changed, 14 insertions, 6 deletions

diff --git a/futures/src/executor.rs b/futures/src/executor.rs
index 2a5281af..5378c0b3 100644
--- a/futures/src/executor.rs
+++ b/futures/src/executor.rs
@@ -1,7 +1,7 @@
 //! Choose your preferred executor to power a runtime.
 mod null;
 
-#[cfg(feature = "thread-pool")]
+#[cfg(all(not(target_arch = "wasm32"), feature = "thread-pool"))]
 mod thread_pool;
 
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio"))]
@@ -15,7 +15,7 @@ mod wasm_bindgen;
 
 pub use null::Null;
 
-#[cfg(feature = "thread-pool")]
+#[cfg(all(not(target_arch = "wasm32"), feature = "thread-pool"))]
 pub use thread_pool::ThreadPool;
 
 #[cfg(all(not(target_arch = "wasm32"), feature = "tokio"))]
@@ -41,8 +41,15 @@ pub trait Executor: Sized {
     /// Spawns a future in the [`Executor`].
     ///
     /// [`Executor`]: trait.Executor.html
+    #[cfg(not(target_arch = "wasm32"))]
     fn spawn(&self, future: impl Future<Output = ()> + Send + 'static);
 
+    /// Spawns a local future in the [`Executor`].
+    ///
+    /// [`Executor`]: trait.Executor.html
+    #[cfg(target_arch = "wasm32")]
+    fn spawn(&self, future: impl Future<Output = ()> + 'static);
+
     /// Runs the given closure inside the [`Executor`].
     ///
     /// Some executors, like `tokio`, require some global state to be in place
diff --git a/futures/src/executor/null.rs b/futures/src/executor/null.rs
index 6d5cf982..65e2e2df 100644
--- a/futures/src/executor/null.rs
+++ b/futures/src/executor/null.rs
@@ -11,5 +11,9 @@ impl Executor for Null {
         Ok(Self)
     }
 
+    #[cfg(not(target_arch = "wasm32"))]
     fn spawn(&self, _future: impl Future<Output = ()> + Send + 'static) {}
+
+    #[cfg(target_arch = "wasm32")]
+    fn spawn(&self, _future: impl Future<Output = ()> + 'static) {}
 }
diff --git a/futures/src/executor/wasm_bindgen.rs b/futures/src/executor/wasm_bindgen.rs
index 69b7c7e2..94d694c8 100644
--- a/futures/src/executor/wasm_bindgen.rs
+++ b/futures/src/executor/wasm_bindgen.rs
@@ -9,10 +9,7 @@ impl Executor for WasmBindgen {
         Ok(Self)
     }
 
-    fn spawn(
-        &self,
-        future: impl futures::Future<Output = ()> + Send + 'static,
-    ) {
+    fn spawn(&self, future: impl futures::Future<Output = ()> + 'static) {
         wasm_bindgen_futures::spawn_local(future);
     }
 }