transient srecord noeq G22NetworkInstance(G22Network network) {
  new Map<S, O> elementsByIdentifier;
  new Map<G22NetworkElement, O> elementsByBlueprint;
  
  void makeInstance(G22Utils g22utils, G22NetworkElement e) {
    if (e == null) ret;
    
    O instance = e.makeInstance(g22utils, this);
    print("Calculated: " + instance);
    
    if (instance != null) {
      elementsByBlueprint.put(e, instance);
      mapPut(elementsByIdentifier, e.identifier(), instance);
    }
  }
  
  void init(G22Utils g22utils) {
    // This is in wrong order anyway
    for (e : network.elements)
      makeInstance(g22utils, e);
  }
}

Began life as a copy of #1035446