error[E0277]: the trait bound `Bar: Copy` is not satisfied --> $DIR/migrate-fail.rs:11:38 | LL | let arr: [Option; 2] = [x; 2]; | ^ the trait `Copy` is not implemented for `Bar` | = note: required for `Option` to implement `Copy` = note: the `Copy` trait is required because this value will be copied for each element of the array help: consider annotating `Bar` with `#[derive(Copy)]` | LL + #[derive(Copy)] LL | struct Bar; | error[E0277]: the trait bound `Bar: Copy` is not satisfied --> $DIR/migrate-fail.rs:17:38 | LL | let arr: [Option; 2] = [x; 2]; | ^ the trait `Copy` is not implemented for `Bar` | = note: required for `Option` to implement `Copy` = note: the `Copy` trait is required because this value will be copied for each element of the array help: consider annotating `Bar` with `#[derive(Copy)]` | LL + #[derive(Copy)] LL | struct Bar; | error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0277`.