fix implicit_scope_test and builtin_identifier_test

test/codegen_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Tests code generation.
 /// Runs Dart Dev Compiler on all input in the `codegen` directory and checks
 /// that the output is what we expected.
 library dev_compiler.test.codegen_test;
 
 import 'dart:io';
@@ skipping 103 matching lines @@
         tests.forEach((name, contents) {
           new File(path.join(languageDir, '${filename}_${name}_multi.dart'))
               .writeAsStringSync(contents);
         });
       }
     }
   }
 
   for (var dir in [null, 'language']) {
     group('dartdevc ' + path.join('test', 'codegen', dir), () {
-      var outDir = path.join(expectDir, dir);
+      var outDir = new Directory(path.join(expectDir, dir));
+      if (!outDir.existsSync()) outDir.createSync(recursive: true);
 
       var testFiles = _findTests(path.join(inputDir, dir), filePattern);
       for (var filePath in testFiles) {
         var filename = path.basenameWithoutExtension(filePath);
 
         test('$filename.dart', () {
           compilerMessages.writeln('// Messages from compiling $filename.dart');
 
           // TODO(jmesserly): this was added to get some coverage of source maps
           // and closure annotations.
           // We need a more comprehensive strategy to test them.
           var sourceMaps = filename == 'map_keys';
           var closure = filename == 'closure';
           var success = compile(filePath, realSdkContext,
               sourceMaps: sourceMaps, closure: closure);
 
           // Write compiler messages to disk.
-          new File(path.join(outDir, '$filename.txt'))
+          new File(path.join(outDir.path, '$filename.txt'))
               .writeAsStringSync('$compilerMessages');
 
-          var outFile = new File(path.join(outDir, '$filename.js'));
+          var outFile = new File(path.join(outDir.path, '$filename.js'));
           expect(outFile.existsSync(), success,
               reason: '${outFile.path} was created iff compilation succeeds');
         });
       }
     });
   }
 
   if (Platform.environment.containsKey('COVERALLS_TOKEN')) {
     group('sdk', () {
       // The analyzer does not bubble exception messages for certain internal
@@ skipping 82 matching lines @@
     print('[AnalysisEngine] error $message $exception');
   }
 
   @override void logError2(String message, Object exception) {
     print('[AnalysisEngine] error $message $exception');
   }
 
   void logInformation(String message, [CaughtException exception]) {}
   void logInformation2(String message, Object exception) {}
 }