// Deleting the .next method makes for-of stop working on arrays. | |
load(libdir + "asserts.js"); | |
load(libdir + "iteration.js"); | |
var iterProto = Object.getPrototypeOf([][Symbol.iterator]()); | |
delete iterProto.next; | |
assertThrowsInstanceOf(function () { for (var v of []) ; }, TypeError); |