PollInput implementation

macros/node-poll-variants/tests/generate.rs

@@ -1,6 +1,7 @@
 #![feature(async_fn_in_trait, impl_trait_projections)]
 
 use node_poll_variants::PollVariants;
+use physical_node::CriticalError;
 use physical_node::transducer::input::Poll;
 
 #[derive(PollVariants)]
@@ -21,8 +22,8 @@ where
 {
     type Value = SecondT;
 
-    async fn poll(&self) -> Self::Value {
-        self.second
+    async fn poll(&self) -> Result<Self::Value, CriticalError> {
+        Ok(self.second)
     }
 }