{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
    let mut nodes = IndexVec::from_elem_n(err_node, num_nodes);
    let err_node = ParentedNode { parent: ItemLocalId::ZERO, node: Node::Err(item.span()) };
    // This node's parent should never be accessed: the owner's parent is computed by the