PollInput implementation

src/lib.rs

@@ -5,4 +5,4 @@ pub mod transducer;
 pub mod cell;
 mod error;
 
-pub use error::*;
+pub use error::CriticalError;

src/transducer/input.rs

@@ -1,5 +1,7 @@
+use crate::CriticalError;
+
 pub trait Poll {
     type Value: Copy;
 
-    async fn poll(&self) -> Self::Value;
+    async fn poll(&self) -> Result<Self::Value, CriticalError>;
 }