{"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
        let BindingsIdx(idx, nidx) = self.copy(child);
    fn push_nested(&mut self, parent: &mut BindingsIdx, child: &BindingsIdx) {
        self.nodes[parent.0].push(LinkNode::Node(Rc::new(BindingKind::Nested(idx, nidx))));