pub fn map_err(
parser: ParserHandle,
f: impl FnMut(Box<dyn Error>) -> Box<dyn Error> + Send + Sync + 'static,
) -> ParserHandle
pub fn map_err(
parser: ParserHandle,
f: impl FnMut(Box<dyn Error>) -> Box<dyn Error> + Send + Sync + 'static,
) -> ParserHandle