v8/test/mjsunit/regress/regress-649078.js

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// Copyright 2016 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.
let p = Promise.resolve();
Object.defineProperty(p, 'then', {
get: () => new Proxy(function() {}, p)
});
new Promise((r) => r(p));