{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"debug!(\"add_constraint(index={},"}]}
        debug!("add_constraint(index={}, variance={:?})", index, variance);
    fn add_constraint(&mut self, current: &CurrentItem, index: u32, variance: VarianceTermPtr<'a>) {
        self.constraints.push(Constraint {