The borrow checker but for ruby.
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https://github.com/rust-unofficial/patterns … has a lot of various patterns, though the questions I gave there are more about ownership than any design patterns. https://gist.github.com/sgrif/102c67c5ae59ce95ce5fd50018067782 … covers how various types in Rust answer them briefly
Some examples of where being able to take ownership of an argument is really important/helpful are cases like AR attribute assignment (need the "original" value for dirty tracking, have to know you can't mutate it) or use as a key in a hash map (return of hash must not change)
