// Copyright (C) 2016 the V8 project authors. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- es6id: 21.1.1 description: Subclassing the String object info: | 21.1.1 The String Constructor ... The String constructor is designed to be subclassable. It may be used as the value of an extends clause of a class definition. Subclass constructors that intend to inherit the specified String behaviour must include a super call to the String constructor to create and initialize the subclass instance with a [[StringData]] internal slot. ---*/ class S extends String {} var s = new S(' test262 '); assert.sameValue(s.trim(), 'test262'); reportCompare(0, 0);