// Copyright 2015 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: --noturbo-osr

function f() {
  "use asm";
  function g() {
    function f() {};
  }
  return g;
}

f()();
