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This is not added as a separate package for a few reasons: - It is part of the official (though pre-release) Buck2 distribution. - It has not yet been renamed to `buck2-rust-project`, and the package name `rust-project` might be too confusing to have in Nixpkgs. - The extra 4.4M are arguably not a dealbreaker. Most Buck2 projects are likely to be complex enough that the extra disk/network usage would be marginal.