anchor.diff:     * directly, or `null` if the list has not been computed yet.
      */
     List<TypeParameterType> _typeParameterTypes;
  -
  -  /**
  -   * A cached list containing all of the type parameter types of this element,
  -   * including those declared by this element directly and those declared by any
  -   * enclosing elements, or `null` if the list has not been computed yet.
  -   */
  -  List<TypeParameterType> _allTypeParameterTypes;
  -
  -  /**
  -   * Return all type parameter types of the element that encloses element.
  -   * Not `null`, but might be empty for top-level and static class members.
  -   */
  -  List<TypeParameterType> get allEnclosingTypeParameterTypes {
  -    return enclosingTypeParameterContext?.allTypeParameterTypes ??
  -        const <TypeParameterType>[];
  -  }
  -
  -  /**
  -   * Return all type parameter types of this element.
  -   */
  -  List<TypeParameterType> get allTypeParameterTypes {
  -    if (_allTypeParameterTypes == null) {
  -      _allTypeParameterTypes = <TypeParameterType>[];
  -      // The most logical order would be (enclosing, this).
  -      // But we have to have it like this to be consistent with (inconsistent
  -      // by itself) element builder for generic functions.
  -      _allTypeParameterTypes.addAll(typeParameterTypes);
  -      _allTypeParameterTypes.addAll(allEnclosingTypeParameterTypes);
  -    }
  -    return _allTypeParameterTypes;
  -  }
   
     /**
      * Get the type parameter context enclosing this one, if any.
  
positive.code:   }
  
    @override
    List<TypeParameterType> get allEnclosingTypeParameterTypes {
      if (isStatic) {
        return const <TypeParameterType>[];
      }
      return super.allEnclosingTypeParameterTypes;
    }
  
    @override
    PropertyAccessorElement get correspondingGetter {
      if (isGetter || variable == null) {
        return null;
  
negative.code:   }
  
    @override
    String get displayName {
      String displayName = super.displayName;
      if ("unary-" == displayName) {
  