v8/test/mjsunit/es9/regress/regress-866861.js

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// 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 = [];