I've come to the conclusion I need to develop this rust program in much smaller steps if I'm going to get it to work
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or, I could make commits Clone, or at least their header data. but, partly to force myself to learn how to do tricky memory stuff in rust, and partly b/c the C impl gets away with just using pointers everywhere, I don't want to do that
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Returning &T is basically the rust version, but is much more restrictive. If you want to let folks hold onto it you have to return things like Rc. It's less impl leaking and more stating guarantees
