Dart2js enum parsing.

sdk/lib/_internal/compiler/implementation/tree/unparser.dart

Index: sdk/lib/_internal/compiler/implementation/tree/unparser.dart
diff --git a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
index 88fa1d7ef115a89f4f08e0607a80b4b10f1edfe8..df3226f48af209b7be770041408145acad8e3379 100644
--- a/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
+++ b/sdk/lib/_internal/compiler/implementation/tree/unparser.dart
@@ -73,6 +73,13 @@ class Unparser implements Visitor {
     sb.write('}');
   }
 
+  visitEnum(Enum node) {
+    sb.write('enum ');
+    visit(node.name);
+    sb.write(' ');
+    visit(node.names);
+  }
+
   visitClassNode(ClassNode node) {
     unparseClassWithBody(node, node.body.nodes);
   }