michael@0: function factorial(n) {
michael@0:   if (n <= 1) {
michael@0:     return 1;
michael@0:   } else {
michael@0:     return n * factorial(n - 1);
michael@0:   }
michael@0: }
michael@0: 
michael@0: function* yielder(n) {
michael@0:   while (n-- >= 0) {
michael@0:     yield { value: n, squared: n * n };
michael@0:   }
michael@0: }
michael@0: 
michael@0: function thrower() {
michael@0:   throw new Error("Curse your sudden but inevitable betrayal!");
michael@0: }
michael@0: 
michael@0: function main() {
michael@0:   factorial(5);
michael@0: 
michael@0:   // XXX bug 923729: Can't test yielding yet.
michael@0:   // for (let x of yielder(5)) {}
michael@0: 
michael@0:   try {
michael@0:     thrower();
michael@0:   } catch (e) {
michael@0:   }
michael@0: }