// Copyright 2018 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.// Test subclassing of SegmenterclassCustomSegmenterextendsIntl.Segmenter{constructor(locales,options){super(locales,options);this.isCustom=true;}}constseg=newCustomSegmenter("zh");assertEquals(true,seg.isCustom,"Custom property");assertEquals(Object.getPrototypeOf(seg),CustomSegmenter.prototype,"Prototype");