lexical-super-property-from-within-constructor.js (1334B)
1 // Copyright (C) 2015 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 es6id: 14.2.16 5 description: > 6 Runtime Semantics: Evaluation 7 8 super 9 10 ... 11 4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict). 12 ... 13 14 The non-normative note elaborates on the "scope" argument: 15 16 An ArrowFunction does not define local bindings for arguments, super, this, or new.target. Any reference to arguments, super, or this within an ArrowFunction must resolve to a binding in a lexically enclosing environment. Typically this will be the Function Environment of an immediately enclosing function. Even though an ArrowFunction may contain references to super, the function object created in step 4 is not made into a method by performing MakeMethod. An ArrowFunction that references super is always contained within a non-ArrowFunction and the necessary state to implement super is accessible via the scope that is captured by the function object of the ArrowFunction. 17 ---*/ 18 19 var count = 0; 20 21 class A { 22 constructor() { 23 count++; 24 } 25 increment() { 26 count++; 27 } 28 } 29 30 class B extends A { 31 constructor() { 32 super(); 33 (_ => super.increment())(); 34 } 35 } 36 37 38 var bar = new B(); 39 40 assert.sameValue(count, 2); 41 42 reportCompare(0, 0);