michael@0: // Array.keys() and .entries() on an empty array produce empty iterators
michael@0: 
michael@0: var arr = [];
michael@0: var ki = arr.keys(), ei = arr.entries();
michael@0: var p = Object.getPrototypeOf(ki);
michael@0: assertEq(Object.getPrototypeOf(ei), p);
michael@0: 
michael@0: for (let k of ki)
michael@0:   throw "FAIL";
michael@0: for (let [k, v] of ei)
michael@0:   throw "FAIL";