function test() {

function * g (){}
var iterator = new g.constructor("a","b","c","yield a; yield b; yield c;")(5,6,7);
var item = iterator.next();
var passed = item.value === 5 && item.done === false;
item = iterator.next();
passed    &= item.value === 6 && item.done === false;
item = iterator.next();
passed    &= item.value === 7 && item.done === false;
item = iterator.next();
passed    &= item.value === undefined && item.done === true;
return passed;
      
}

if (!test())
    throw new Error("Test failed");