anchor.diff:  import 'package:analyzer/src/services/lint.dart';
   import 'package:analyzer/src/summary/summary_sdk.dart';
   import 'package:analyzer/src/task/options.dart';
  +import 'package:analyzer/src/util/sdk.dart';
   import 'package:args/args.dart';
   import 'package:front_end/src/api_prototype/byte_store.dart';
   import 'package:front_end/src/base/performance_logger.dart';
  
positive.code:         getAnalysisOptions(path, contextRoot: contextRoot);
      //_processAnalysisOptions(context, optionMap);
      final sf = createSourceFactory(path, options);
      AnalysisDriver driver = new AnalysisDriver(
          analysisDriverScheduler,
          performanceLog,
  
negative.code:         contextRoot,
          sf,
          options,
          enableKernelDriver: previewDart2,
          kernelPlatformFolder: kernelPlatformFolder);
      // temporary plugin support:
      if (onCreateAnalysisDriver != null) {
        onCreateAnalysisDriver(driver, analysisDriverScheduler, performanceLog,
  