error[E0718]: `owned_box` lang item must be applied to a struct
  --> $DIR/E0718.rs:4:1
   |
LL | #[lang = "owned_box"]
   | ^^^^^^^^^^^^^^^^^^^^^ attribute should be applied to a struct, not a static item

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0718`.