anchor.diff:        libraryRoot: libraryRoot,
         packageRoot: packageRoot,
         packagesAreImmutable: true,
  -      reuseLibrary: updater.reuseLibrary).then((Compiler newCompiler) {
  +      reuseLibrary: reuseLibrary).then((Compiler newCompiler) {
       var filter = new ScriptOnlyFilter(script);
       newCompiler.enqueuerFilter = filter;
       return runPoiInternal(newCompiler, updater, position);
  
positive.code: 
  import 'package:compiler/implementation/dart2jslib.dart' show
      Compiler,
      Enqueuer,
      QueueFilter,
      WorkItem;
  
negative.code:     const bool.fromEnvironment('PRINT_SCOPE_INFO', defaultValue: true);
  
  Stopwatch wallClock = new Stopwatch();
  
  PoiTask poiTask;
  
  Compiler cachedCompiler;
  
  