anchor.diff:  import 'package:analyzer/dart/ast/visitor.dart';
   
   import '../analyzer.dart';
  -import '../ast.dart';
   
   const _desc = r'Provide doc comments for all public APIs.';
   
  
positive.code:     registry.addClassTypeAlias(this, visitor);
      registry.addFunctionTypeAlias(this, visitor);
    }
  
    @override
    void visit(DartProject project) {
      this.project = project;
    }
  }
  
  class _Visitor extends GeneralizingAstVisitor {
  
negative.code: 
  ''';
  
  class PackageApiDocs extends LintRule {
    PackageApiDocs()
        : super(
              name: 'package_api_docs',
              description: _desc,
              details: _details,
              group: Group.style);
  
    @override
    void registerNodeProcessors(
  