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 { | ^ - value partially moved here | | | value used here after partial move | = note: partial move occurs because value has type `Box`, which does not implement the `Copy` trait error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0382`.