node/deps/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;
assertEquals("foo", source);
assertTrue(global);
assertTrue(ignoreCase);
assertFalse(multiline);
assertEquals(0, lastIndex);