error[E0382]: use of partially moved value
  --> $DIR/bind-by-move-no-subbindings-fun-param.rs:7:6
   |
LL | fn f(a @ A(u): A) -> Box<u8> {
   |      ^     - value partially moved here
   |      |
   |      value used here after partial move
   |
   = note: partial move occurs because value has type `Box<u8>`, which does not implement the `Copy` trait

error: aborting due to previous error

For more information about this error, try `rustc --explain E0382`.