{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
    let mut test_runner = cx.test_runner.clone().unwrap_or_else(|| {
    // test::test_main_static(...)
        ecx.path(sp, vec![test_ident, Ident::from_str_and_span(runner_name, sp)])