Fix bug in checked mode: we need to register super fields as well, because the super class might no…

sdk/lib/_internal/compiler/implementation/js_backend/backend.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 js_backend;
 
 typedef void Recompile(Element element);
 
 class ReturnInfo {
   HType returnType;
@@ skipping 1115 matching lines @@
     } else if (cls == compiler.numClass || cls == jsNumberClass) {
       addInterceptors(jsIntClass, enqueuer, elements);
       addInterceptors(jsDoubleClass, enqueuer, elements);
       addInterceptors(jsNumberClass, enqueuer, elements);
     } else if (cls.isNative()) {
       addInterceptorsForNativeClassMembers(cls, enqueuer);
     }
 
     if (compiler.enableTypeAssertions) {
       // We need to register is checks for assignments to fields.
-      cls.forEachLocalMember((Element member) {
+      cls.forEachMember((Element enclosing, Element member) {
         if (!member.isInstanceMember() || !member.isField()) return;
         DartType type = member.computeType(compiler);
         enqueuer.registerIsCheck(type, elements);
-      });
+      }, includeSuperMembers: true);
     }
   }
 
   void registerUseInterceptor(Enqueuer enqueuer) {
     assert(!enqueuer.isResolutionQueue);
     if (!enqueuer.nativeEnqueuer.hasNativeClasses()) return;
     enqueuer.registerStaticUse(getNativeInterceptorMethod);
     enqueuer.registerStaticUse(defineNativeMethodsFinishMethod);
     enqueuer.registerStaticUse(initializeDispatchPropertyMethod);
     TreeElements elements = compiler.globalDependencies;
@@ skipping 679 matching lines @@
   ClassElement get listImplementation => jsArrayClass;
   ClassElement get constListImplementation => jsArrayClass;
   ClassElement get fixedListImplementation => jsFixedArrayClass;
   ClassElement get growableListImplementation => jsExtendableArrayClass;
   ClassElement get mapImplementation => mapLiteralClass;
   ClassElement get constMapImplementation => constMapLiteralClass;
   ClassElement get typeImplementation => typeLiteralClass;
   ClassElement get boolImplementation => jsBoolClass;
   ClassElement get nullImplementation => jsNullClass;
 }