Device macro to generate stateful and publish variants of device specific poll inputs.

src/transducer/output.rs

@@ -1,7 +1,9 @@
 pub trait Output {
     type Value: Copy;
 
-    //TODO: return result
-    //TODO: Make maybe async
-    fn output(&mut self, setting: Self::Value);
-}
+    //TODO: Should this be maybe async?
+    fn output(&mut self, setting: Self::Value) -> Result<(), InvalidOutputSetting>;
+}
+
+/// Indicates the setting given for an [Output] is statically known to be an impossible setting to achieve.
+pub struct InvalidOutputSetting;