anchor.diff:    Future<List<Assist>> compute() async {
       // TODO(brianwilkerson) Determine whether this await is necessary.
       await null;
  -    if (!setupCompute()) {
  +    if (!_setupCompute()) {
         return assists;
       }
   
  
positive.code:     return utils.getRangeText(range);
    }
  
    Future<void> _swapParentAndChild(InstanceCreationExpression parent,
        InstanceCreationExpression child, AssistKind kind) async {
      // TODO(brianwilkerson) Determine whether this await is necessary.
  
negative.code:   }
  
    Future<List<Assist>> computeAssist(AssistKind assistKind) async {
      if (!_setupCompute()) {
        return assists;
      }
  
  