src/v8/test/mjsunit/regress/regress-5085.js

// 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.

// Flags: --allow-natives-syntax

function foo(x) {
  return x instanceof Proxy;
}

assertFalse(foo({}));
assertFalse(foo({}));
%OptimizeFunctionOnNextCall(foo);
assertFalse(foo({}));