Fix has_pending_exception logic in API's Array::CloneElementAt

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6054 matching lines @@
 MaybeLocal<Object> Array::CloneElementAt(Local<Context> context,
                                          uint32_t index) {
   PREPARE_FOR_EXECUTION(context, "v8::Array::CloneElementAt()", Object);
   auto self = Utils::OpenHandle(this);
   if (!self->HasFastObjectElements()) return Local<Object>();
   i::FixedArray* elms = i::FixedArray::cast(self->elements());
   i::Object* paragon = elms->get(index);
   if (!paragon->IsJSObject()) return Local<Object>();
   i::Handle<i::JSObject> paragon_handle(i::JSObject::cast(paragon));
   Local<Object> result;
-  has_pending_exception = ToLocal<Object>(
-      isolate->factory()->CopyJSObject(paragon_handle), &result);
+  has_pending_exception =
+      !ToLocal<Object>(isolate->factory()->CopyJSObject(paragon_handle),
+                       &result);
   RETURN_ON_FAILED_EXECUTION(Object);
   RETURN_ESCAPED(result);
 }
 
 
 Local<Object> Array::CloneElementAt(uint32_t index) {
   auto context = ContextFromHeapObject(Utils::OpenHandle(this));
   RETURN_TO_LOCAL_UNCHECKED(CloneElementAt(context, index), Object);
 }
 
@@ skipping 1945 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal