error[E0382]: use of moved value: `x` --> $DIR/issue-10398.rs:5:14 | LL | let _a = x; | - value moved here LL | drop(x); | ^ value used here after move | = note: move occurs because `x` 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`.