anchor.diff:    bool removeAs = false;
   
     @override
  +  Iterable<String> get _toStringParts =>
  +      [...super._toStringParts, if (removeAs) 'removeAs'];
  +
  +  @override
     EditPlan _apply(AsExpression node, FixAggregator aggregator) {
       if (removeAs) {
         return aggregator.planner.extract(node,
  
positive.code:   /// Gets the type for any introduced "as" cast, or `null` if no "as" cast is
    /// being introduced.
    DartType get introducesAsType => _introducesAsType;
  
    /// Causes a null check to be added to this expression, with the given [info].
    void addNullCheck(AtomicEditInfo info, {HintComment hint}) {
  
negative.code:   NodeChangeForAnnotation() : super._();
  
    @override
    Iterable<String> get _toStringParts =>
        [if (changeToRequiredKeyword) 'changeToRequiredKeyword'];
  
    @override
    EditPlan _apply(Annotation node, FixAggregator aggregator) {
      if (!changeToRequiredKeyword) {
        return aggregator.innerPlanForNode(node);
  