The borrow checker but for ruby.
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I mean you could write RefCell, not that you should
IMO the most useful part of the ownership system in Rust isn't even the checking (at least when considering it in the context of a memory safe language like Ruby) it's having a way to express a major piece of your API.
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Would love an elaboration on “express a major API”
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Are you going to mutate this thing? Are you going to hold onto it? Am I allowed to mutate this thing after giving it to you? Am I allowed to mutate this thing you gave me? Are you going to call `close` on this file/network stream? Do I need to seek back to a previous position?
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