nonwritable-nonenumerable-nonconfigurable-descriptors-set-by-arguments.js (1145B)
1 // Copyright (C) 2017 Caio Lima. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 description: Mapped arguments property descriptor change to non-writable, non-enumerable and non-configurable 6 info: | 7 Change the descriptor using [[DefineOwnProperty]] to {writable: false, enumerable: false}, 8 set argument[0] = 2 and then change property descriptor to {configurable: false}. 9 The descriptor's enumerable property continues with its configured value. 10 flags: [noStrict] 11 esid: sec-arguments-exotic-objects-defineownproperty-p-desc 12 includes: [propertyHelper.js] 13 ---*/ 14 15 function fn(a) { 16 Object.defineProperty(arguments, "0", {writable: false, enumerable: false}); 17 arguments[0] = 2; 18 Object.defineProperty(arguments, "0", {configurable: false}); 19 20 verifyProperty(arguments, "0", { 21 value: 1, 22 writable: false, 23 enumerable: false, 24 configurable: false, 25 }); 26 27 // Postcondition: Arguments mapping is removed. 28 a = 3; 29 30 verifyProperty(arguments, "0", { 31 value: 1, 32 writable: false, 33 enumerable: false, 34 configurable: false, 35 }); 36 } 37 fn(1); 38 39 reportCompare(0, 0);