Support local variables in analyzer2dart.

pkg/analyzer2dart/test/end2end_test.dart

 // Copyright (c) 2014, 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.
 
 /// End-to-end test of the analyzer2dart compiler.
 
 import 'dart:async';
 
 import 'mock_sdk.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
@@ skipping 158 matching lines @@
 ''');
   });
 
   test('Top level field access', () {
     checkResult('''
 main(args) {
   return deprecated;
 }
 ''');
   });
+
+  test('Local variables', () {
+    checkResult('''
+main() {
+  var a;
+  return a;
+}
+''', '''
+main() {}
+''');
+
+    checkResult('''
+main() {
+  var a = 0;
+  return a;
+}
+''', '''
+main() {
+  return 0;
+}
+''');
+  });
 }
 
 checkResult(String input, [String expectedOutput]) {
   if (expectedOutput == null) {
     expectedOutput = input;
   }
 
   CollectingOutputProvider outputProvider = new CollectingOutputProvider();
   MemoryResourceProvider provider = new MemoryResourceProvider();
   DartSdk sdk = new MockSdk();
@@ skipping 24 matching lines @@
     sb.write(text);
   }
 
   void addError(errorEvent, [StackTrace stackTrace]) {}
 
   void close() {}
 
   String get text => sb.toString();
 }