Catch exceptions thrown when enqueuing change records.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c5e036ae6e6137cd9ff23a4608b7ec7718d837c8..b20f96d7b36cfb2e8435806dde18e63abd8125d5 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1126,8 +1126,8 @@ class Object {
       StorePropertyMode data_store_mode = NORMAL_PROPERTY);
   MUST_USE_RESULT static MaybeHandle<Object> WriteToReadOnlyProperty(
       LookupIterator* it, Handle<Object> value, StrictMode strict_mode);
-  static Handle<Object> SetDataProperty(LookupIterator* it,
-                                        Handle<Object> value);
+  MUST_USE_RESULT static MaybeHandle<Object> SetDataProperty(
+      LookupIterator* it, Handle<Object> value);
   MUST_USE_RESULT static MaybeHandle<Object> AddDataProperty(
       LookupIterator* it, Handle<Object> value, PropertyAttributes attributes,
       StrictMode strict_mode, StoreFromKeyed store_mode);
@@ -2211,10 +2211,10 @@ class JSObject: public JSReceiver {
   Context* GetCreationContext();
 
   // Enqueue change record for Object.observe. May cause GC.
-  static void EnqueueChangeRecord(Handle<JSObject> object,
-                                  const char* type,
-                                  Handle<Name> name,
-                                  Handle<Object> old_value);
+  static MaybeHandle<Object> EnqueueChangeRecord(Handle<JSObject> object,

[Igor Sheludko, 2014/10/13 10:47:24]

MUST_USE_RESULT?

+                                                 const char* type,
+                                                 Handle<Name> name,
+                                                 Handle<Object> old_value);
 
  private:
   friend class DictionaryElementsAccessor;