error[E0277]: the trait bound `Foo: Copy` is not satisfied --> $DIR/repeat-to-run-dtor-twice.rs:17:15 | LL | let _ = [ a; 5 ]; | ^ the trait `Copy` is not implemented for `Foo` | = note: the `Copy` trait is required because this value will be copied for each element of the array help: consider annotating `Foo` with `#[derive(Copy)]` | LL | #[derive(Copy)] | error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.