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Who owns whom? is a easy quant interview question on language knowledge in Rust.
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This is an easy Rust question that tests your grasp of ownership semantics — one of the language's most distinctive features. Interviewers and technical screens use questions like this to confirm you understand how Rust tracks which part of a program has the right to use, modify, or free a value.
To answer correctly, you need to trace through variable bindings, moves, and borrows as they happen in sequence. Pay attention to when ownership transfers to a function, when a reference is created, and what scope each binding has. The output will depend on whether values are moved, borrowed immutably, or borrowed mutably — and what remains accessible afterward.