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Unsafe Rust: A Promise
When it comes to unsafe code, the library has to work with the compiler to the language. And so in this case, as of 1.0, we believe that unsafe Rust provided certain guarantees, but it hadn't actually thought about it enough. So I think saying that not all code has to be unsafe is still a big step up. The fact that you do have to write unsafe code some of the time means that we really need to figure out what it means to write unsafecode and what it meansto go from unsafe code to safe code.