{"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"assert_pns_eq_sub!(\"%-10.10s\","}]}
    assert_pns_eq_sub!("%-10.10s",
        { None, "", Some(N::Num(10)), None, None, "s", (0, 4), });
        { None, "-", Some(N::Num(10)), Some(N::Num(10)), None, "s", (0, 8), });