usethiserror::Error;/// Errors from nerrs.
#[derive(Debug, Error)]pubenumError{/// No model is loaded.
#[error("model is not loaded — call load_model() first")]
ModelNotLoaded,/// Error from the underlying CRF layer.
#[error(transparent)]
Crf(#[from]crfrs::Error),}/// Convenience alias.
pubtypeResult<T>=std::result::Result<T, Error>;