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Anyone developing games with this project is likely to be on Windows, Linux or Mac, on x64 or aarch64. Such developers would likely install Rust with rustup, not with the distro provided one. So yes, any developer that fits this description can rely on the newest, hottest compiler.

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And that's perfectly fine. But game developers are a small fractions of Rust developers.

I think most devs use rustup, not the distro supplied one.

Is rustc even in the repos? Should it (and cargo) be? Or should they just have rustup? I lean towards the latter

rustc is in pretty much every distro's repos at this point. They often have Cargo too. They sometimes, but not always, have rustup.

Some distros ship programs compiled with rust, and they do so using the version of rustc in the repo.

Right, but it's this specific project that requires the latest Rust compiler, not Rust libraries in general.

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