oneshot deadlock in 0.1.0-pre8 about kanal HOT 4 OPEN

@fereidani Hola! I was experimenting with kanal and tried to use it as a drop-in replacement for crossbeam_channel (in my fork of Tantivy search library) and flume (in Iroh, IPFS implementation in Rust). Highly likely it is me doing something wrong, but I didn't manage to make tests to pass, looks like them had been deadlocked.

I've created an exhibition PR for you, https://github.com/izihawa/tantivy/pull/16/files
where I've replaced channels. Before patch cargo test works, after patch - does not.

I'm not very experienced in all this stuff and not sure is it any helpful, but still hope you may dig something there

UPD.
Well, I've should paid more attention to documentation, oneshot in kanal behaves differently and it was a reason of blockings. Tantivy works well if I take bounded(1) instead of oneshot

from kanal.

Thanks for the report, I'm working on it.

from kanal.

Can you reproduce it on the stable branch or is it just on nightly?
Unfortunately, I can't reproduce this issue on my system in stable or nightly and it is making it hard to debug.
Are you sure that there is nothing wrong with your CI?

from kanal.

I can't play it on my machine. But CI with tokyo or async-oneshot works fine in 4 seconds. And the same implementation but with kanal gives this timeout of 2 minutes.

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