src/third_party/mozjs-45/js/src/jit-test/tests/collections/Set-iterator-proxies-2.js

// map.iterator() and iter.next() are non-generic but work on cross-compartment wrappers.

load(libdir + "asserts.js");
load(libdir + "iteration.js");

var g = newGlobal();

var iterator_fn = Set.prototype[Symbol.iterator];
assertThrowsInstanceOf(function () { iterator_fn.call({}); }, TypeError);
assertThrowsInstanceOf(function () { iterator_fn.call(new Map()); }, TypeError);
var setw = g.eval("new Set(['x', 'y'])");
assertIteratorNext(iterator_fn.call(setw), "x");

var next_fn = (new Set())[Symbol.iterator]().next;
assertThrowsInstanceOf(function () { next_fn.call({}); }, TypeError);
assertThrowsInstanceOf(function () { next_fn.call((new Map())[Symbol.iterator]()); }, TypeError);
var iterw = setw[Symbol.iterator]();
assertIteratorResult(next_fn.call(iterw), "x", false);
assertIteratorResult(next_fn.call(iterw), "y", false);
assertIteratorResult(next_fn.call(iterw), undefined, true);