anchor.diff:  
     @override
     void visitMethodDeclaration(MethodDeclaration node) {
  -    _writeNextCodeLine(node);
       _writeln('MethodDeclaration');
       _withIndent(() {
         _writeNamedChildEntities(node);
  
positive.code: 
    @override
    void visitOnClause(OnClause node) {
      _writeNextCodeLine(node);
      _writeln('OnClause');
      _withIndent(() {
        _writeNamedChildEntities(node);
  
negative.code: 
    @override
    void visitLibraryDirective(LibraryDirective node) {
      _writeln('LibraryDirective');
      _withIndent(() {
        _writeNamedChildEntities(node);
  