The idea of Clone is to make it easy to spot where heap allocations are occurring. Look for .clone() and a few others like vec! or Box::new.

借用チェッカーが通らない場合に「とりあえずクローンを作成して切り抜けておいて」、あとからクローンのないコードへの最適化を試みるのもよくあることです。

clone generally performs a deep copy of the value, meaning that if you e.g. clone an array, all of the elements of the array are cloned as well.

The behavior for clone is user-defined, so it can perform custom cloning logic if needed.