src/v8/test/mjsunit/regress-963346.js

// Copyright 2019 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.

// Flags: --allow-natives-syntax

var o = ['3'];
function foo(i) { o.x = i; }
foo("string");
Object.preventExtensions(o);
Object.seal(o);
print('foo');
foo(0);
%HeapObjectVerify(o);
assertEquals(o.x, 0);