This is correct. I suppose if you could get folks to mark all memcpy move ctors explicitly with a macro instead of relying on the default you could specialize s

This is correct. I suppose if you could get folks to mark all memcpy move ctors explicitly with a macro instead of relying on the default you could specialize std::vector's move with sfinae. Bit hacky. It already specializes for pod types though. Lack of move and copy ctors in rust greatly simplifies things like this, and makes it very explicit when code is running, but the trade-off is that intrusive data structures are hard to do on the stack in rust.