1 files changed, 7 insertions, 2 deletions
diff --git a/src/sandbox.rs b/src/sandbox.rs
index acf7f5e0..2c0332ff 100644
--- a/src/sandbox.rs
+++ b/src/sandbox.rs
@@ -1,4 +1,4 @@
-use crate::{Application, Command, Element, Settings};
+use crate::{executor, Application, Command, Element, Settings, Subscription};
 
 /// A sandboxed [`Application`].
 ///
@@ -81,7 +81,7 @@ pub trait Sandbox {
     /// The type of __messages__ your [`Sandbox`] will produce.
     ///
     /// [`Sandbox`]: trait.Sandbox.html
-    type Message: std::fmt::Debug + Send + Clone;
+    type Message: std::fmt::Debug + Send;
 
     /// Initializes the [`Sandbox`].
     ///
@@ -133,6 +133,7 @@ impl<T> Application for T
 where
     T: Sandbox,
 {
+    type Executor = executor::Null;
     type Message = T::Message;
 
     fn new() -> (Self, Command<T::Message>) {
@@ -149,6 +150,10 @@ where
         Command::none()
     }
 
+    fn subscription(&self) -> Subscription<T::Message> {
+        Subscription::none()
+    }
+
     fn view(&mut self) -> Element<'_, T::Message> {
         T::view(self)
     }