function gen() {
    yield 3;
}

var g = gen();
assertEq(g.close(), undefined);

var h = gen();
assertEq(h.next(), 3);
var caught = false;
try {
    h.next();
} catch (e) {
    caught = true;
    assertEq(e instanceof StopIteration, true);
}
assertEq(caught, true);
assertEq(h.close(), undefined);

reportCompare();