Support parsing of enums in dart2js.

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

 // Copyright (c) 2012, 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.
 
 part of tree;
 
 String unparse(Node node, {minify: true}) {
   Unparser unparser = new Unparser(minify: minify);
   unparser.unparse(node);
   return unparser.result;
@@ skipping 106 matching lines @@
       indentMore();
       for (Node member in members) {
         visit(member);
         newline();
       }
       indentLess();
     }
     write('}');
   }
 
+  visitEnum(Enum node) {
+    sb.write('enum ');
+    visit(node.name);

[floitsch, 2014/11/06 12:41:58]

Why don't we need "{" and "}" here?

[Johnni Winther, 2014/11/06 12:49:41]

It is in the NodeList [names].

+    sb.write(' ');
+    visit(node.names);
+  }
+
   visitClassNode(ClassNode node) {
     unparseClassWithBody(node, node.body.nodes);
   }
 
   visitMixinApplication(MixinApplication node) {
     visit(node.superclass);
     write(' with ');
     visit(node.mixins);
   }
 
@@ skipping 657 matching lines @@
   }
 
   visitStatement(Statement node) {
     throw 'internal error'; // Should not be called.
   }
 
   visitStringNode(StringNode node) {
     throw 'internal error'; // Should not be called.
   }
 }