michael@0: // Test that each yield* loop just checks "done", and "value" is only
michael@0: // fetched once at the end.
michael@0: 
michael@0: var log = "";
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: function Iter(val, count) {
michael@0:     function next() {
michael@0:         log += 'n';
michael@0:         return {
michael@0:             get done() { log += "d"; return count-- == 0; },
michael@0:             get value() { log += "v"; return val; }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     function iterator() {
michael@0:         log += 'i';
michael@0:         return this;
michael@0:     }
michael@0: 
michael@0:     this.next = next;
michael@0:     this[std_iterator] = iterator;
michael@0: }
michael@0: 
michael@0: function* delegate(iter) { return yield* iter; }
michael@0: 
michael@0: var inner = new Iter(42, 5);
michael@0: var outer = delegate(inner);
michael@0: 
michael@0: // Five values, and one terminal value.
michael@0: outer.next();
michael@0: outer.next();
michael@0: outer.next();
michael@0: outer.next();
michael@0: outer.next();
michael@0: outer.next();
michael@0: 
michael@0: assertEq(log, "indndndndndndv");
michael@0: 
michael@0: // Outer's dead, man.  Outer's dead.
michael@0: assertDeepEq(outer.next(), {value: undefined, done: true});
michael@0: 
michael@0: // No more checking the iterator.
michael@0: assertEq(log, "indndndndndndv");
michael@0: 
michael@0: if (typeof reportCompare == "function")
michael@0:     reportCompare(true, true);