<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_2a0muq8nhu3mj1hlge9b0ne0de, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
sclass Flattener {
  new L out;
  
  void add(O o) {
    if (o cast O[])           for (x : o) add(o);
    else if (o cast Iterable) for (x : o) add(o);
    else if (o != null) add(o);
  }
  
  L toList() { ret out; }
  O[] toArray() { ret toObjectArray(out); }
}