michael@0: // for-of on an Array consults the prototype chain when it encounters a hole.
michael@0: 
michael@0: load(libdir + "iteration.js");
michael@0: 
michael@0: var m = {1: 'peek'};
michael@0: var a = [0, , 2, 3];
michael@0: a.__proto__ = m;
michael@0: var log = [];
michael@0: Object.prototype[std_iterator] = Array.prototype[std_iterator];
michael@0: for (var x of a)
michael@0:     log.push(x);
michael@0: assertEq(log[1], 'peek');
michael@0: assertEq(log.join(), "0,peek,2,3");