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Microsoft wants to replace its entire C and C++ codebase, perhaps by 2030
(www.theregister.com)
This is a most excellent place for technology news and articles.
If they rely on UB at all, then this won't work. At best you get a compile time error, but more likely your rust program will do weird stuff with memory. And given how much people rely on compilers "acting nice" when it comes to aliasing (something rust does not fuck around with), I wouldn't hold my breathe