anchor.diff:        String packageConfigPath = options.packageConfigPath;
         Uri fileUri = new Uri.file(packageConfigPath);
         try {
  -        File configFile = new File.fromUri(fileUri).absolute;
  +        io.File configFile = new io.File.fromUri(fileUri).absolute;
           List<int> bytes = configFile.readAsBytesSync();
           Map<String, Uri> map = pkgfile.parse(bytes, configFile.uri);
           return new MapPackages(map);
  
positive.code: import 'package:plugin/manager.dart';
  import 'package:plugin/plugin.dart';
  
  Source createSource(Uri sourceUri) =>
      new FileBasedSource(new JavaFile(sourceUri.toFilePath()));
  
  /// Print the given message and exit with the given [exitCode]
  void printAndFail(String message, {int exitCode: 15}) {
    print(message);
    exit(exitCode);
  }
  
  AnalysisOptions _buildAnalyzerOptions(DriverOptions options) {
  
negative.code: library linter.src.analysis;
  
  import 'dart:collection';
  import 'dart:io' as io;
  
  import 'package:analyzer/dart/element/element.dart';
  import 'package:analyzer/file_system/file_system.dart'
      show File, Folder, ResourceUriResolver;
  import 'package:analyzer/file_system/physical_file_system.dart';
  import 'package:analyzer/source/package_map_provider.dart';
  import 'package:analyzer/source/package_map_resolver.dart';
  