{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
    let def_location = if cx.sess().opts.unstable_opts.debug_info_type_line_numbers {
    let type_name = compute_debuginfo_type_name(cx.tcx, union_type, false);
        Some(file_metadata_from_def_id(cx, Some(union_def_id)))