The mpsc try_recv method was removed in #3263 due to problems with the implementation. This issue tracks adding it back.

Note that it is currently possible to do unconstrained(rx.recv()).now_or_never() using tokio::task::unconstrained and FutureExt::now_or_never, but be aware that it has the same issue as the old try_recv that previously sent messages may not be available immediately. To be clear, they are not lost, the messages are just not received until later.