anchor.diff:          return 'SemanticsFlag.isSelected';
         case _kIsButtonIndex:
           return 'SemanticsFlag.isButton';
  +      case _kIsLinkIndex:
  +        return 'SemanticsFlag.isLink';
         case _kIsTextFieldIndex:
           return 'SemanticsFlag.isTextField';
         case _kIsFocusableIndex:
  
positive.code:   /// and iOS's VoiceOver provides an additional hint when the focused object is
    /// a button.
    static const SemanticsFlag isButton = SemanticsFlag._(_kIsButtonIndex);
  
    /// Whether the semantic node represents a text field.
    ///
  
negative.code:   static const int _kIsMultilineIndex = 1 << 19;
    static const int _kIsReadOnlyIndex = 1 << 20;
    static const int _kIsFocusableIndex = 1 << 21;
    static const int _kIsLinkIndex = 1 << 22;
  
    const SemanticsFlag._(this.index);
  
  