anchor.diff:  
   main(List<String> arguments) async {
     await asyncTest(() async {
  -    await withTemporyDirectory("compile_platform_test_", (Uri tmp) async {
  +    await withTemporaryDirectory("compile_platform_test_", (Uri tmp) async {
         String patchedSdk = Uri.base
             .resolveUri(new Uri.file(Platform.resolvedExecutable))
             .resolve("patched_sdk")
  
positive.code: 
  library fasta.test.compile_platform_test;
  
  import 'dart:io';
  
  import 'package:async_helper/async_helper.dart';
  
negative.code:   });
  }
  
  withTemporaryDirectory(String prefix, Future f(Uri tmp)) async {
    Directory tmp = await Directory.systemTemp.createTemp(prefix);
    try {
      await f(tmp.uri);
  