{"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"assert_pns_eq_sub!(\"%10s\","}]}
    assert_pns_eq_sub!("%10s",
        { None, "'", None, None, None, "d", (0, 3), });
        { None, "", Some(N::Num(10)), None, None, "s", (0, 4), });