Changes to Derive(PollVariants) to accept any path for the value type.

src/error.rs

@@ -0,0 +1,12 @@
+/// An error that it is likely impossible to recover. This error should only be created in
+/// situations where attempts to recover have already been attempted and have failed. Error handling
+/// should consist of attempting to alert another system for maintenance and attempting to shut down
+/// any systems that depend on the correct functionality of the component having errors.
+///
+/// In many systems there can be a single function for handling any critical error as a critical
+/// error always means everything needs to be stopped.
+#[derive(Copy, Clone, Eq, PartialEq)]
+pub enum CriticalError {
+    /// Critical communication failed and retries are either impossible or also failed.
+    Communication,
+}

src/lib.rs

@@ -3,3 +3,6 @@
 
 pub mod transducer;
 pub mod cell;
+mod error;
+
+pub use error::*;