Propagate not-found on proxy target to GetRealNamedProperty

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 3f3e8ce93cc19d5938c0cfd4388a8f34fb1b5b7b..37827033a8c66f317f40854928964963413d8934 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -720,9 +720,14 @@ MaybeHandle<Object> Object::GetProperty(LookupIterator* it) {
       case LookupIterator::NOT_FOUND:
       case LookupIterator::TRANSITION:
         UNREACHABLE();
-      case LookupIterator::JSPROXY:
-        return JSProxy::GetProperty(it->isolate(), it->GetHolder<JSProxy>(),
-                                    it->GetName(), it->GetReceiver());
+      case LookupIterator::JSPROXY: {
+        bool was_found;
+        MaybeHandle<Object> result =
+            JSProxy::GetProperty(it->isolate(), it->GetHolder<JSProxy>(),
+                                 it->GetName(), it->GetReceiver(), &was_found);
+        if (!was_found) it->NotFound();
+        return result;
+      }
       case LookupIterator::INTERCEPTOR: {
         bool done;
         Handle<Object> result;
@@ -762,7 +767,9 @@ MaybeHandle<Object> Object::GetProperty(LookupIterator* it) {
 MaybeHandle<Object> JSProxy::GetProperty(Isolate* isolate,
                                          Handle<JSProxy> proxy,
                                          Handle<Name> name,
-                                         Handle<Object> receiver) {
+                                         Handle<Object> receiver,
+                                         bool* was_found) {
+  *was_found = true;
   if (receiver->IsJSGlobalObject()) {
     THROW_NEW_ERROR(
         isolate,
@@ -795,7 +802,9 @@ MaybeHandle<Object> JSProxy::GetProperty(Isolate* isolate,
     // 7.a Return target.[[Get]](P, Receiver).
     LookupIterator it =
         LookupIterator::PropertyOrElement(isolate, receiver, name, target);
-    return Object::GetProperty(&it);
+    MaybeHandle<Object> result = Object::GetProperty(&it);
+    *was_found = it.IsFound();
+    return result;
   }
   // 8. Let trapResult be ? Call(trap, handler, «target, P, Receiver»).
   Handle<Object> trap_result;