michael@0: // Test that yield* can appear in a loop, and alongside yield.
michael@0: 
michael@0: function* countdown(n) {
michael@0:     while (n > 0) {
michael@0:         yield n;
michael@0:         yield* countdown(--n);
michael@0:     }
michael@0:     return 34;
michael@0: }
michael@0: 
michael@0: function collect_results(iter) {
michael@0:     var ret = [];
michael@0:     var result;
michael@0:     do {
michael@0:         result = iter.next();
michael@0:         ret.push(result);
michael@0:     } while (!result.done);
michael@0:     return ret;
michael@0: }
michael@0: 
michael@0: var expected = [
michael@0:     // yield in countdown(3), n == 3
michael@0:     {value: 3, done: false},
michael@0:     // yield in yield* countdown(2), n == 2
michael@0:     {value: 2, done: false},
michael@0:     // yield in nested yield* countdown(1), n == 1
michael@0:     {value: 1, done: false},
michael@0:     // countdown(0) yields no values
michael@0:     // second go-through of countdown(2) loop, n == 1
michael@0:     {value: 1, done: false},
michael@0:     // second go-through of countdown(3) loop, n == 2
michael@0:     {value: 2, done: false},
michael@0:     // yield in yield* countdown(1), n == 1
michael@0:     {value: 1, done: false},
michael@0:     // third go-through of countdown(3) loop, n == 1
michael@0:     {value: 1, done: false},
michael@0:     // done
michael@0:     {value: 34, done: true}
michael@0: ];
michael@0: 
michael@0: assertDeepEq(expected, collect_results(countdown(3)));
michael@0: 
michael@0: if (typeof reportCompare == "function")
michael@0:     reportCompare(true, true);