pub struct Span {
    pub tag: String,
    pub text: String,
}

impl std::fmt::Debug for Span {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
        let tag = format!("{:?}", self.tag);
        write!(f, "{tag:>20}: {:?}", self.text)
    }
}