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// 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
function foo(a, i) {
a[i] = 1;
return a[i];
}
class MyArray extends (class C extends Array {
}){};
o = new MyArray;
%EnsureFeedbackVectorForFunction(foo);
// initialize IC
assertEquals(1, foo(o, 0));
assertEquals(1, foo(o, 1));
// Change prototype
o.__proto__.__proto__ = new Int32Array(2);
// Check it still works
assertEquals(undefined, foo(o, 2));
assertEquals(undefined, foo(o, 2));
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