super-must-be-called.js (933B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 es6id: 19.2.1 5 description: > 6 super must be called to initialize Function internal slots 7 info: | 8 19.2.1 The Function Constructor 9 10 ... 11 12 The Function constructor is designed to be subclassable. It may be used as the 13 value of an extends clause of a class definition. Subclass constructors that 14 intend to inherit the specified Function behaviour must include a super call 15 to the Function constructor to create and initialize a subclass instances with 16 the internal slots necessary for built-in function behaviour. 17 ... 18 ---*/ 19 20 class Fn extends Function { 21 constructor() {} 22 } 23 24 assert.throws(ReferenceError, function() { 25 new Fn(); 26 }); 27 28 class Fn2 extends Function { 29 constructor() { 30 super(); 31 } 32 } 33 34 var fn = new Fn2(); 35 assert(fn instanceof Function); 36 37 reportCompare(0, 0);