Support enclosingClass on deserialized local elements

tests/compiler/dart2js/serialization/model_test_helper.dart

 // Copyright (c) 2015, 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 dart2js.serialization_model_test;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
@@ skipping 164 matching lines @@
         areNodesEquivalent,
         areClosureScopesEquivalent,
         verbose: verbose,
         keyToString: nodeToString);
     checkSets(
         closureData1.variablesUsedInTryOrGenerator,
         closureData2.variablesUsedInTryOrGenerator,
         "$element1.variablesUsedInTryOrGenerator",
         areLocalsEquivalent,
         verbose: verbose);
+    if (element1 is MemberElement && element2 is MemberElement) {
+      MemberElement member1 = element1.implementation;
+      MemberElement member2 = element2.implementation;
+      checkSets(
+          member1.nestedClosures,
+          member2.nestedClosures,
+          "$member1.nestedClosures",
+          areElementsEquivalent,
+          verbose: verbose,
+          onSameElement: (a, b) {
+            LocalFunctionElement localFunction1 = a.expression;
+            LocalFunctionElement localFunction2 = b.expression;
+            checkElementIdentities(
+                localFunction1, localFunction2,
+                'enclosingClass',
+                localFunction1.enclosingClass, localFunction2.enclosingClass);
+          });
+    }
   }
   JavaScriptBackend backend1 = compiler1.backend;
   JavaScriptBackend backend2 = compiler2.backend;
   Expect.equals(
       backend1.inlineCache.getCurrentCacheDecisionForTesting(element1),
       backend2.inlineCache.getCurrentCacheDecisionForTesting(element2),
       "Inline cache decision mismatch for $element1 vs $element2");
 }
 
 void checkMixinUses(
@@ skipping 101 matching lines @@
   return true;
 }
 
 String nodeToString(Node node) {
   String text = '$node';
   if (text.length > 40) {
     return '(${node.runtimeType}) ${text.substring(0, 37)}...';
   }
   return '(${node.runtimeType}) $text';
 }