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use std::fmt::{self, Debug, Formatter};
use ecow::EcoString;
/// A label for an element.
#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Label(pub EcoString);
impl Debug for Label {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "<{}>", self.0)
}
}
/// Indicates that an element cannot be labelled.
pub trait Unlabellable {}
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