// 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() {
  class A {}

  function foo(a, fn) {
    const C = a.constructor;
    fn(a);
    return a instanceof C;
  }

  assertTrue(foo(new A, (a) => {}));
  assertTrue(foo(new A, (a) => {}));
  %OptimizeFunctionOnNextCall(foo);
  assertTrue(foo(new A, (a) => {}));
  assertFalse(foo(new A, (a) => { a.__proto__ = {}; }));
})();