michael@0: // Test that yield* can appear in a loop, and inside yield.
michael@0: 
michael@0: function* countdown(n) {
michael@0:     while (n > 0) {
michael@0:         yield (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:     // Only 34 yielded from the "yield" and the last return make it out.
michael@0:     // Three yields in countdown(3), two in countdown(2), and one in
michael@0:     // countdown(1) (called twice).
michael@0:     {value: 34, done: false},
michael@0:     {value: 34, done: false},
michael@0:     {value: 34, done: false},
michael@0:     {value: 34, done: false},
michael@0:     {value: 34, done: false},
michael@0:     {value: 34, done: false},
michael@0:     {value: 34, done: false},
michael@0:     {value: 34, done: true}, // final
michael@0: ];
michael@0: 
michael@0: assertDeepEq(collect_results(countdown(3)), expected);
michael@0: 
michael@0: if (typeof reportCompare == "function")
michael@0:     reportCompare(true, true);