1514   Maybe<bool> is_extensible = JSReceiver::IsExtensible(target);  in GetPrototype()
5824     Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);  in CheckHasTrap()
7153   bool extensible = JSObject::IsExtensible(object);  in OrdinaryDefineOwnProperty()
7483     if (!JSObject::IsExtensible(Handle<JSObject>::cast(it->GetReceiver()))) {  in CreateDataProperty()
7766   Maybe<bool> maybe_extensible = JSReceiver::IsExtensible(target);  in DefineOwnProperty()
8048     Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);  in GetOwnPropertyDescriptor()
8061   Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);  in GetOwnPropertyDescriptor()
8387   Maybe<bool> extensible = JSReceiver::IsExtensible(receiver);  in GenericTestIntegrityLevel()
8482   Maybe<bool> target_result = JSReceiver::IsExtensible(target);  in PreventExtensions()
8549 Maybe<bool> JSReceiver::IsExtensible(Handle<JSReceiver> object) {  in IsExtensible()  function in v8::internal::JSReceiver
8551     return JSProxy::IsExtensible(Handle<JSProxy>::cast(object));  in IsExtensible()
8553   return Just(JSObject::IsExtensible(Handle<JSObject>::cast(object)));  in IsExtensible()
8557 Maybe<bool> JSProxy::IsExtensible(Handle<JSProxy> proxy) {  in IsExtensible()  function in v8::internal::JSProxy
8575     return JSReceiver::IsExtensible(target);  in IsExtensible()
8586   Maybe<bool> target_result = JSReceiver::IsExtensible(target);  in IsExtensible()
8598 bool JSObject::IsExtensible(Handle<JSObject> object) {  in IsExtensible()  function in v8::internal::JSObject
15497   Maybe<bool> is_extensible = JSReceiver::IsExtensible(target);  in SetPrototype()