1 error[E0277]: `main` has invalid return type `impl Copy`
2 --> $DIR/termination-trait-impl-trait.rs:2:14
4 LL | fn main() -> impl Copy { }
5 | ^^^^^^^^^ `main` can only return types that implement `Termination`
7 = help: consider using `()`, or a `Result`
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0277`.