The answer is: **no, it won't**:

```js run
new Promise(function(resolve, reject) {
  setTimeout(() => {
    throw new Error("Whoops!");
  }, 1000);
}).catch(alert);
```

As said in the chapter, there's an "implicit `try..catch`" around the function code. So all synchronous errors are handled.

But here the error is generated not while the executor is running, but later. So the promise can't handle it.