public void fil_absent(String url) {Tfds.Eq_false(Io_mgr.I.ExistsFil(Io_url_.mem_fil_(url)), "fil should not exist: {0}", url);}
Io_fil file_(String url_str, String data) {return new Io_fil(Io_url_.mem_fil_(url_str), data);}
public Io_fil reg_(String url, String... v) {return new Io_fil(Io_url_.mem_fil_(url), String_.Concat_lines_nl(v));}