<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_lr4m70k1o0fapcgfemqoplbaq6, 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 OKOrError<A> implements IF0<A> {
  A value;
  gettable Throwable error;
  
  *() {}
  *(A *value) {}
  *(bool dummy, Throwable *error) {}
  
  bool ok aka isOK() { ret error == null; }
  
  toString {
    ret ok()
      ? "ok: " + str(value)
      : "Error: " + str(error);
  }
  
  public A get() { ret !ok() ? null : value; }
  
  public A getMandatory() { if (!ok()) throw rethrow(error); ret value; }
}