{"ast_node_type":"other","tokens":[{"end":5,"kind":"keyword","start":0,"text":"{"}]}
    {
        find_attr!(tcx.get_all_attrs(main_def_id), AttributeKind::TrackCaller(span) => *span)
        tcx.dcx().emit_err(errors::TrackCallerOnMain { span: attr_span, annotated: main_span });