Support enums in dart2dart.

tests/language/enum_duplicate_lib.dart

Index: tests/language/enum_duplicate_lib.dart
diff --git a/tools/canary.dart b/tests/language/enum_duplicate_lib.dart
similarity index 64%
copy from tools/canary.dart
copy to tests/language/enum_duplicate_lib.dart
index cca1f90cd7be8eb2481a00a89bbc7ba7edaa6d4f..b9c84f5109af8178afedae4313ab9056c08b263b 100644
--- a/tools/canary.dart
+++ b/tests/language/enum_duplicate_lib.dart
@@ -2,10 +2,13 @@
 // 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.
 
-// Script which exits with code 42.
+library enum_duplicate_lib;
 
-import 'dart:io';
+enum Enum1 {
+  A,
+  B,
+}
 
-void main() {
-  exitCode = 42;
+class Enum2 {
+  static Iterable get values => ['Enum2.A', 'Enum2.B'];
 }