// revisions: old new
//[old] edition:2015
//[new] edition:2021
fn id<F>(f: Copy) -> usize {
//~^ ERROR the trait `Copy` cannot be made into an object
//[old]~| WARN trait objects without an explicit `dyn` are deprecated
//[old]~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
//[old]~| WARN trait objects without an explicit `dyn` are deprecated
//[old]~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
    f()
}
fn main() {}