self-async-function.js

async = generator => {
  const generator = generatorCreator();
  
  function next(value) {
    const nextResult = generator.next(value);
    if (nextResult.done) return nextResult.value;
    nextResult.value.then(next);
  };
  
  next();
}

async = generator => should be replaced to async = () => or will be raised error Duplicate declaration generator