anchor.diff:  }
   
   class LabelTarget implements JumpTarget {
  -  @override
  -  final MemberBuilder parent;
  -
     final JumpTarget breakTarget;
   
     final JumpTarget continueTarget;
  
positive.code: 
    final int functionNestingLevel;
  
    final MemberBuilder parent;
  
    final int charOffset;
  
    JumpTarget(
        this.kind, this.functionNestingLevel, this.parent, this.charOffset);
  
    Uri get fileUri => parent.fileUri!;
  
    bool get isBreakTarget => kind == JumpTargetKind.Break;
  
  
negative.code:     List<Label>? labels = const FixedNullableList<Label>()
          .popNonNullable(stack, labelCount, dummyLabel);
      enterLocalScope('labeledStatement', scope.createNestedLabelScope());
      LabelTarget target =
          new LabelTarget(functionNestingLevel, uri, token.charOffset);
      if (labels != null) {
        for (Label label in labels) {
          scope.declareLabel(label.name, target);
  