1. abortsignal api: throwifaborted

2. fetchevent api: respondwith: `networkerror` thrown if the request mode is `same-origin` and the response type is `cors`

3. javascript built-in: asyncgenerator: throw

4. javascript built-in: generator: throw

5. javascript statement: `function*` statement: `iteratorresult` object instead of throwing

6. javascript statement: throw