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I'm also very interested in Rust being used for game programming. It's why I tried to create a game a number of months ago, just to get a feel for the language. The result was a simple somewhat pong-like game: https://github.com/FrozenCow/rust-airhockey. At the time the language was in the middle of, what seemed like, a number of changes.
Python. Python is also a very useful programming language, it can also be used for exploit writing, If you go for python first then make sure that you learn Python socket programming as it will help you a lot in the exploit creation process. PERL.