anchor.diff:  
   const CHANNELS = const ['dev', 'stable'];
   
  -const SDK_FILES = const [
  -  'sdk/dartsdk-macos-x64-release.zip',
  -  'sdk/dartsdk-macos-ia32-release.zip'
  -];
  -
  -const DARTIUM_FILES = const [
  -  'dartium/dartium-macos-ia32-release.zip',
  -  'dartium/content_shell-macos-ia32-release.zip'
  -];
  -
  -final FILES = []..addAll(SDK_FILES)..addAll(DARTIUM_FILES);
  +const FILES = const [x64File, ia32File, dartiumFile, contentShellFile];
  +
  +const urlBase = 'https://storage.googleapis.com/dart-archive/channels';
  +const x64File = 'sdk/dartsdk-macos-x64-release.zip';
  +const ia32File = 'sdk/dartsdk-macos-ia32-release.zip';
  +const dartiumFile = 'dartium/dartium-macos-ia32-release.zip';
  +const contentShellFile = 'dartium/content_shell-macos-ia32-release.zip';
   
   Future<String> getHash256(
       String channel, String revision, String download) async {
  
positive.code:   end
  end
  ''';
  }
  
  Future runGit(List<String> args) async {
    print("git ${args.join(' ')}");
  
negative.code:   end
  end
  ''';
  
  String createDartFormula(
      Map revisions, Map hashes, String devVersion, String stableVersion) => '''
  require 'formula'
  
  class Dart < Formula
  