element.isMember does not imply element.enclosingElement.isClass? can we fix that?

lib/compiler/implementation/closure.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.
 
 #library("closureToClassMapper");
 
 #import("elements/elements.dart");
 #import("leg.dart");
 #import("scanner/scannerlib.dart");
 #import("tree/tree.dart");
@@ skipping 355 matching lines @@
     void analyzeTypeVariables(DartType type) {
       if (type is TypeVariableType) {
         useLocal(type.element);
       } else if (type is InterfaceType) {
         InterfaceType ifcType = type;
         for (DartType argument in ifcType.arguments) {
           analyzeTypeVariables(argument);
         }
       }
     }
-
-    if (outermostFunctionElement.isMember()
-        && compiler.world.needsRti(outermostFunctionElement.enclosingElement)) {
+    if (outermostFunctionElement.isMember() &&
+        compiler.world.needsRti(outermostFunctionElement.getEnclosingClass())) {
       if (outermostFunctionElement.isInstanceMember()
           || outermostFunctionElement.isGenerativeConstructor()) {
         if (hasTypeVariable(type)) useLocal(closureData.thisElement);
       } else if (outermostFunctionElement.isFactoryConstructor()) {
         analyzeTypeVariables(type);
       }
     }
 
     node.visitChildren(this);
   }
@@ skipping 209 matching lines @@
   }
 
   visitTryStatement(TryStatement node) {
     // TODO(ngeoffray): implement finer grain state.
     bool oldInTryStatement = inTryStatement;
     inTryStatement = true;
     node.visitChildren(this);
     inTryStatement = oldInTryStatement;
   }
 }