michael@0: // Nested for-of loops can use the same generator-iterator.
michael@0: 
michael@0: function range(n) {
michael@0:     for (var i = 0; i < n; i++)
michael@0:         yield i;
michael@0: }
michael@0: 
michael@0: var r = range(10);
michael@0: for (var a of r)
michael@0:     for (var b of r)
michael@0:         for (var c of r)
michael@0:             for (var d of r)
michael@0:                 ;
michael@0: 
michael@0: assertEq(a, 0);
michael@0: assertEq(b, 1);
michael@0: assertEq(c, 2);
michael@0: assertEq(d, 9);