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crossbeam-channels is merged into std. https://github.com/rust-lang/rust/pull/93563 std::sync::mpsc is now implemented using crossbeam-channels primitives.

IMO, crossbeam-channels can be easily removed right now and replaced by std::sync.

That's not msrv 1.56 compatible though, from which version on is this stabilized? A major feature for using crossbeam is having MPMC available.

It is not in stable yet, but it is merged into 1.67, according to https://releases.rs/docs/unreleased/1.67.0/

The mpmc part is not being stabilized in 1.67 though, for now they're just keeping it as a private module and rewriting std::sync::mpsc to use it internally.