is everything in rust's std implemented in rust? I don't mean in the metacircular sense, I mean could they be written and compiled by an end user
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ah so I think I've not met the *mut type yet
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Note that box (like most code) uses NonNull<T> which is a wrapper around a raw pointer that besides showing that instant the compiler knows can't be null for optimization purposes. This is why Option<Box<T>> is the same size as Box<T>
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