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#[derive(Debug, PartialEq, Eq)]
pub enum IOError {
    InvalidDigraphHeader,
    InvalidSizeChar,
    GraphTooLarge,
}

#[cfg(test)]
mod testing {
    use super::IOError;

    #[test]
    fn test_error() {
        let err = IOError::InvalidDigraphHeader;
        println!("{:?}", err);
    }
}