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It would be helpful to see an example from a real application, too.

A very large Vec<String> (say a few million non-empty strings) would do I'd guess, Rust would drop the Vec which would recursively drop each String.

I start thinking about c++ 'placement new' and COBOL copy record structures.

And aquire/release objects from resource pools that manage themselves. And message queue handlers. And pass-by-reference, and object pools..