{"ast_node_type":"variable","tokens":[{"end":23,"kind":"keyword","start":0,"text":"let"}]}
    let dcx = cx.dcx();
fn not_testable_error(cx: &ExtCtxt<'_>, attr_sp: Span, item: Option<&ast::Item>) {
    let msg = "the `#[test]` attribute may only be used on a non-associated function";