@dom96: I don't understand how this could work. I don't think there are FDs involved in the timer implementation, at least on posix.
To my solution I should add, that it _only_ works on posix systems, not on Windows.
- after called `AsyncFuture.fail`, the future is still running haoliang
- after called `AsyncFuture.fail`, the future is still runn... arnetheduck
- after called `AsyncFuture.fail`, the future is still ... royneary
- after called `AsyncFuture.fail`, the future is st... dom96
- after called `AsyncFuture.fail`, the future i... royneary
- after called `AsyncFuture.fail`, the fut... dom96
- after called `AsyncFuture.fail`, the... royneary
- after called `AsyncFuture.fail`,... haoliang
- after called `AsyncFuture.fail`,... haoliang
- after called `AsyncFuture.fail`,... haoliang
- after called `AsyncFuture.fail`,... haoliang
