Support enums in dart2dart.

pkg/compiler/lib/src/dart_backend/outputter.dart

Index: pkg/compiler/lib/src/dart_backend/outputter.dart
diff --git a/pkg/compiler/lib/src/dart_backend/outputter.dart b/pkg/compiler/lib/src/dart_backend/outputter.dart
index 45da8e904ebdb97053f18b2c7a2573517050293d..9838c885446e70b8070c45e460f93178bff4fc8a 100644
--- a/pkg/compiler/lib/src/dart_backend/outputter.dart
+++ b/pkg/compiler/lib/src/dart_backend/outputter.dart
@@ -162,7 +162,7 @@ class DartOutputter {
     makePlaceholders(element) {
       collector.collect(element);
 
-      if (element.isClass) {
+      if (element.isClass && !element.isEnumClass) {
         elementInfo.classMembers[element].forEach(makePlaceholders);
       }
     }
@@ -276,6 +276,7 @@ class LibraryInfo {
         }
       }
     }
+
     // As of now names of named optionals are not renamed. Therefore add all
     // field names used as named optionals into [fixedMemberNames].
     for (final element in resolvedElements) {
@@ -286,6 +287,10 @@ class LibraryInfo {
         if (!optional.isInitializingFormal) continue;
         fixedDynamicNames.add(optional.name);
       }
+      ClassElement cls = element.enclosingClass;
+      if (cls != null && cls.isEnumClass) {
+        fixedDynamicNames.add('index');
+      }
     }
     // The VM will automatically invoke the call method of objects
     // that are invoked as functions. Make sure to not rename that.
@@ -409,7 +414,6 @@ class ElementInfoProcessor implements ElementInfo {
   }
 
   void addMember(element) {
-    ElementAst elementAst = parseElementAst(element);
     if (element.isClassMember) {
       ClassElement enclosingClass = element.enclosingClass;
       assert(enclosingClass.isClass);
@@ -417,10 +421,11 @@ class ElementInfoProcessor implements ElementInfo {
       assert(shouldOutput(enclosingClass));
       addClass(enclosingClass);
       classMembers[enclosingClass].add(element);
-      processElement(element, elementAst);
+      if (enclosingClass.isEnumClass) return;
+      processElement(element, parseElementAst(element));
     } else {
       if (element.isTopLevel) {
-        addTopLevel(element, elementAst);
+        addTopLevel(element, parseElementAst(element));
       }
     }
   }
@@ -448,12 +453,16 @@ class MainOutputGenerator {
        bool enableMinification: false}) {
     for (Element element in elementInfo.topLevelElements) {
       topLevelNodes.add(elementInfo.elementAsts[element].ast);
-      if (element.isClass && !element.isMixinApplication) {
+      if (element.isClass) {
+        ClassElement cls = element;
+        if (cls.isMixinApplication || cls.isEnumClass) {
+          continue;
+        }
         final members = <Node>[];
-        for (Element member in elementInfo.classMembers[element]) {
+        for (Element member in elementInfo.classMembers[cls]) {
           members.add(elementInfo.elementAsts[member].ast);
         }
-        memberNodes[elementInfo.elementAsts[element].ast] = members;
+        memberNodes[elementInfo.elementAsts[cls].ast] = members;
       }
     }