+#[cfg(any(test, fuzzing, feature = "_test_utils"))]
+pub mod test_utils;
+
+/// impls of traits that add exra enforcement on the way they're called. Useful for detecting state
+/// machine errors and used in fuzz targets and tests.
+#[cfg(any(test, fuzzing, feature = "_test_utils"))]
+pub mod enforcing_trait_impls;