anchor.diff:    @override
     void visitEnumConstantDeclaration(EnumConstantDeclaration node) {
       _checkChildrenEntitiesLinking(node);
  -    _writeNextCodeLine(node);
       _writeln('EnumConstantDeclaration');
       _withIndent(() {
         _writeNamedChildEntities(node);
  
positive.code: 
    @override
    void visitFieldFormalParameter(FieldFormalParameter node) {
      _writeNextCodeLine(node);
      _writeln('FieldFormalParameter');
      _withIndent(() {
        _writeNamedChildEntities(node);
  
negative.code: 
    @override
    void visitExportDirective(ExportDirective node) {
      _writeln('ExportDirective');
      _withIndent(() {
        _writeNamedChildEntities(node);
  