{"ast_node_type":"function","tokens":[{"end":88,"kind":"keyword","start":0,"text":"fn"}]}
    fn push_missing(&mut self, idx: &mut BindingsIdx, var: &Symbol, kind: MetaVarKind) {
        self.nodes[idx.0].push(LinkNode::Node(Rc::new(BindingKind::Missing(var.clone(), kind))));