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use proc_macro::TokenStream; #[proc_macro_attribute] pub fn class(attr: TokenStream, item: TokenStream) -> TokenStream { println!("attr: \"{}\"", attr.to_string()); println!("item: \"{}\"", item.to_string()); item } #[cfg(test)] mod tests { #[test] fn it_works() { assert_eq!(2 + 2, 4); } }