anchor.diff:    Iterable<Operator> get publicInstanceOperators =>
         model_utils.filterNonPublic(instanceOperators);
   
  -  List<Operator>? _publicInstanceOperatorsSorted;
  -  List<Operator> get publicInstanceOperatorsSorted =>
  -      _publicInstanceOperatorsSorted ??= publicInstanceOperators.toList()
  -        ..sort(byName);
  +  late final List<Operator> publicInstanceOperatorsSorted =
  +      publicInstanceOperators.toList()..sort(byName);
   
     /// Fields fully declared in this [Container].
     Iterable<Field>? get declaredFields;
  
positive.code:   /// See [Inheritable.canonicalEnclosingContainer].
    bool containsElement(Element? element) => allElements.contains(element);
  
    Set<Element?>? _allElements;
    Set<Element?> get allElements =>
        _allElements ??= allModelElements.map((e) => e.element).toSet();
  
    Map<String?, List<ModelElement>>? _membersByName;
  
    /// Given a ModelElement that is a member of some other class, return
    /// the member of this class that has the same name and runtime type.
  
negative.code:   Iterable<Field> get publicStaticFields =>
        model_utils.filterNonPublic(staticFields);
  
    late final List<Field> publicStaticFieldsSorted = publicStaticFields.toList()
      ..sort(byName);
  
    Iterable<Field> get staticFields => declaredFields!.where((f) => f.isStatic);
  
  