v8/test/mjsunit/regress/regress-447561.js

// 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.

__proto__ = /foo/gi;
assertThrows(function() { source });
assertThrows(function() { global });
assertThrows(function() { ignoreCase });
assertThrows(function() { multiline });
assertEquals(0, lastIndex);