anchor.diff:  
     void _visitMapLiteralEntries(NodeList<MapLiteralEntry> nodes,
         {String separator}) {
  -
       if (nodes == null) return;
       int size = nodes.length;
       if (size == 0) return;
  
positive.code:     currentClass = node;
  
      var name = node.name.name;
      var supertype = node.element.supertype;
  
      out.write('class $name');
      _visitNode(node.typeParameters);
  
  
negative.code: 
    Element get currentLibrary => libraryInfo.library;
  
    void generateLibrary(
        Iterable<CompilationUnit> units, CheckerReporter reporter) {
      out.write("""
  var $_libraryName;
  (function ($_libraryName) {
  