michael@0: // Giving an Array an own .iterator property affects for-of.
michael@0: 
michael@0: load(libdir + "asserts.js");
michael@0: load(libdir + "iteration.js");
michael@0: 
michael@0: var a = [];
michael@0: a[std_iterator] = function* () {
michael@0:     yield 'o';
michael@0:     yield 'k';
michael@0: };
michael@0: var s = '';
michael@0: for (var v of a)
michael@0:     s += v;
michael@0: assertEq(s, 'ok');
michael@0: 
michael@0: a[std_iterator] = undefined;
michael@0: assertThrowsInstanceOf(function () { for (var v of a) ; }, TypeError);