The surprising part is that it does not compile with `Copy`, not that it compiles with `Copy`. The rules are that if a move a necessary then it is performed. Th

The surprising part is that it does not compile with `Copy`, not that it compiles with `Copy`. The rules are that if a move a necessary then it is performed. The tricky part is that move is not necessary for `Copy` types, because you can capture a reference and still get an owned value.