Created input types.

src/lib.rs

@@ -1,4 +1,5 @@
 #![no_std]
+#![feature(async_fn_in_trait)]
 
 pub mod transducer;
 pub mod cell;

src/transducer/input.rs

@@ -1,6 +1,10 @@
 use crate::cell::CellView;
 use crate::transducer::Stateful;
 
+pub trait Poll<T: Copy> {
+    async fn poll() -> T;
+}
+
 pub struct StatefulInput<'a, T: Copy> {
     pub state_cell: CellView<'a, T>,
 }