use std::{error, fmt}; /// An error that can never occur pub enum Never {} impl fmt::Debug for Never { fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result { match *self {} } } impl fmt::Display for Never { fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result { match *self {} } } impl error::Error for Never {}