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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_u073s6ij8eekn2m071sllit7vn, 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 />
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<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 />
concept G22Variable extends ConceptWithChangeListeners is IPersistenceInfo {
  S name;
  settableWithVar volatile O value;
  settable bool persistent;
  
  public Map _persistenceInfo() { ret litmap("value", persistent); }
  
  O get() { ret value; }
  
  void setValueIfNull(O defaultValue) {
    if (defaultValue != null && value == null) value(defaultValue);
  }
}