1 files changed, 11 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/es9/regress/regress-866861.js b/deps/v8/test/mjsunit/es9/regress/regress-866861.js
new file mode 100644
index 00000000000..dc6c764f5c9
--- /dev/null
+++ b/deps/v8/test/mjsunit/es9/regress/regress-866861.js
@@ -0,0 +1,11 @@
+// Copyright 2018 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.
+
+// Check that property constness for out-of-object fields is valid
+var o = {};
+var toString = o.toString = function() {};
+try {
+assertEquals({ toString }, o = { ...o });
+} catch (e) {}
+o.toString = [];