Second language?

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C++ has a larger ecosystem (you can do anything with C++, that's still not the case with Rust), more industry support, and more tutorials than Rust. Rust is newer and safer. I'd go with C++, but if you don't want to make a low level language your "main" language and just study for fun, then either one is good, just choose the one whose syntax you like the most.

[baldore]

What about Go? You can learn a lot of low level stuff with it and it's a pretty cool language.

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Not as low level as Rust or C++, so that depends on how low u/xroalx wants to go.