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Right now ref_mut is never dropped as it is moved out of and into map_split but if that move was made into a reborrow, then an extra reborrow-injected clone would happen at the map_split call site and an extra drop would happen when the scope in which ref_mut was create is left
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[Pre-RFC] Reborrow trait - language design - Rust Internals

https://internals.rust-lang.org/t/pre-rfc-reborrow-trait/22972
Reborrowing happens implicitly at each coercion-site