error[E0224]: at least one trait is required for an object type --> $DIR/macro-matcher.rs:11:8 | LL | m!(dyn 'static +); | ^^^^^^^^^^^^^ error[E0038]: the trait `Copy` cannot be made into an object --> $DIR/macro-matcher.rs:8:8 | LL | m!(dyn Copy + Send + 'static); | ^^^^^^^^^^^^^^^^^^^^^^^^^ `Copy` cannot be made into an object | = note: the trait cannot be made into an object because it requires `Self: Sized` = note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit error: aborting due to 2 previous errors Some errors have detailed explanations: E0038, E0224. For more information about an error, try `rustc --explain E0038`.