v8/test/mjsunit/regress/regress-observe-map-cache.js

// Copyright 2014 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: --harmony-object-observe
// Flags: --allow-natives-syntax --enable-slow-asserts

function f() {
  var x = new Array(0);
  x[-1] = -1;
  Object.observe(x, function() { });
}

f();
f();